1
|
Badurdeen S, Blank DA, Hoq M, Wong FY, Roberts CT, Hooper SB, Polglase GR, Davis PG. Blood pressure and cerebral oxygenation with physiologically-based cord clamping: sub-study of the BabyDUCC trial. Pediatr Res 2024:10.1038/s41390-024-03131-5. [PMID: 38671085 DOI: 10.1038/s41390-024-03131-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/30/2023] [Accepted: 03/01/2024] [Indexed: 04/28/2024]
Abstract
BACKGROUND Cord-clamping strategies may modify blood pressure (BP) and cerebral tissue oxygen saturation (rStO2) immediately after birth. METHODS We conducted a sub-study nested within the Baby-Directed Umbilical Cord-Clamping trial. Infants ≥32+0 weeks' gestation assessed as requiring resuscitation were randomly allocated to either physiologically-based cord clamping (PBCC), where resuscitation commenced prior to umbilical cord clamping, or standard care where cord clamping occurred early (ECC). In this single-site sub-study, we obtained additional measurements of pre-ductal BP and rStO2. In a separate observational arm, non-randomised vigorous infants received 2 min of deferred cord clamping (DCC) and contributed data for reference percentiles. RESULTS Among 161 included infants, n = 55 were randomly allocated to PBCC (n = 30) or ECC (n = 25). The mean (SD) BP at 3-4 min after birth (primary outcome) in the PBCC group was 64 (10) mmHg compared to 62 (10) mmHg in the ECC group, mean difference 2 mmHg (95% confidence interval -3-8 mmHg, p = 0.42). BP and rStO2 were similar across both randomised arms and the observational arm (n = 106). CONCLUSION We found no difference in BP or rStO2 with the different cord clamping strategies. We report reference ranges for BP and rStO2 for late-preterm and full-term infants receiving DCC. IMPACT Among late-preterm and full-term infants receiving varying levels of resuscitation, blood pressure (BP, at 3-4 minutes and 6 min) and cerebral tissue oxygen saturation (rStO2) are not influenced by timing of cord clamping in relation to establishment of ventilation. Infants in this study did not require advanced resuscitation, where cord clamping strategies may yet influence BP and rStO2. The reference ranges for BP and rStO2 represent the first, to our knowledge, for vigorous late-preterm and full-term infants receiving deferred cord clamping. rStO2 > 90% (~90th percentile) may be used to define cerebral hyperoxia, for instance when studying oxygen supplementation after birth.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Parkville, VIC, 3052, Australia.
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, VIC, 3052, Australia.
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia.
- Department of Paediatrics, Mercy Hospital for Women, Heidelberg, VIC, 3084, Australia.
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, VIC, 3168, Australia
- Department of Paediatrics, Monash University, Clayton, VIC, 3168, Australia
| | - Monsurul Hoq
- Clinical Epidemiology and Biostatistics Unit and Clinical Sciences Research, Murdoch Children's Research Institute, Melbourne, VIC, 3052, Australia
| | - Flora Y Wong
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, VIC, 3168, Australia
- Department of Paediatrics, Monash University, Clayton, VIC, 3168, Australia
| | - Calum T Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, VIC, 3168, Australia
- Department of Paediatrics, Monash University, Clayton, VIC, 3168, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC, 3800, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC, 3800, Australia
| | - Peter G Davis
- Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Parkville, VIC, 3052, Australia
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, VIC, 3052, Australia
| |
Collapse
|
2
|
Panneflek TJR, Kuypers KLAM, Polglase GR, Derleth DP, Dekker J, Hooper SB, van den Akker T, Pas ABT. The influence of chorioamnionitis on respiratory drive and spontaneous breathing of premature infants at birth: a narrative review. Eur J Pediatr 2024:10.1007/s00431-024-05508-4. [PMID: 38558311 DOI: 10.1007/s00431-024-05508-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 02/26/2024] [Accepted: 03/02/2024] [Indexed: 04/04/2024]
Abstract
Most very premature infants breathe at birth but require respiratory support in order to stimulate and support their breathing. A significant proportion of premature infants are affected by chorioamnionitis, defined as an umbrella term for antenatal inflammation of the foetal membranes and umbilical vessels. Chorioamnionitis produces inflammatory mediators that potentially depress the respiratory drive generated in the brainstem. Such respiratory depression could maintain itself by delaying lung aeration, hampering respiratory support at birth and putting infants at risk of hypoxic injury. This inflammatory-mediated respiratory depression may contribute to an association between chorioamnionitis and increased requirement of neonatal resuscitation in premature infants at birth. This narrative review summarises mechanisms on how respiratory drive and spontaneous breathing could be influenced by chorioamnionitis and provides possible interventions to stimulate spontaneous breathing. Conclusion: Chorioamnionitis could possibly depress respiratory drive and spontaneous breathing in premature infants at birth. Interventions to stimulate spontaneous breathing could therefore be valuable. What is Known: • A large proportion of premature infants are affected by chorioamnionitis, antenatal inflammation of the foetal membranes and umbilical vessels. What is New: • Premature infants affected by chorioamnionitis might be exposed to higher concentrations of respiratory drive inhibitors which could depress breathing at birth. • Premature infants affected by chorioamnionitis seem to be associated with a higher and more extensive requirement of resuscitation at birth.
Collapse
Affiliation(s)
- Timothy J R Panneflek
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, P.O. Box 9600, 2300 RC, Leiden, Netherlands.
| | - Kristel L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, P.O. Box 9600, 2300 RC, Leiden, Netherlands
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Douglas P Derleth
- Department of Paediatric and Adolescent Medicine, Mayo Clinic, Rochester, MN, USA
| | - Janneke Dekker
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, P.O. Box 9600, 2300 RC, Leiden, Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Thomas van den Akker
- Department of Obstetrics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, P.O. Box 9600, 2300 RC, Leiden, Netherlands
| |
Collapse
|
3
|
Badurdeen S, Cheong JLY, Donath S, Graham H, Hooper SB, Polglase GR, Jacobs S, Davis PG. Early Hyperoxemia and 2-year Outcomes in Infants with Hypoxic-ischemic Encephalopathy: A Secondary Analysis of the Infant Cooling Evaluation Trial. J Pediatr 2024; 267:113902. [PMID: 38185204 DOI: 10.1016/j.jpeds.2024.113902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 12/15/2023] [Accepted: 01/03/2024] [Indexed: 01/09/2024]
Abstract
OBJECTIVE To determine the causal relationship between exposure to early hyperoxemia and death or major disability in infants with hypoxic-ischemic encephalopathy (HIE). STUDY DESIGN We analyzed data from the Infant Cooling Evaluation (ICE) trial that enrolled newborns ≥35 weeks' gestation with moderate-severe HIE, randomly allocated to hypothermia or normothermia. The primary outcome was death or major sensorineural disability at 2 years. We included infants with arterial pO2 measured within 2 hours of birth. Using a directed acyclic graph, we established that markers of severity of perinatal hypoxia-ischemia and pCO2 were a minimally sufficient set of variables for adjustment in a regression model to estimate the causal relationship between arterial pO2 and death/disability. RESULTS Among 221 infants, 116 (56%) had arterial pO2 and primary outcome data. The unadjusted analysis revealed a U-shaped relationship between arterial pO2 and death or major disability. Among hyperoxemic infants (pO2 100-500 mmHg) the proportion with death or major disability was 40/58 (0.69), while the proportion in normoxemic infants (pO2 40-99 mmHg) was 20/48 (0.42). In the adjusted model, hyperoxemia increased the risk of death or major disability (adjusted risk ratio 1.61, 95% CI 1.07-2.00, P = .03) in relation to normoxemia. CONCLUSION Early hyperoxemia increased the risk of death or major disability among infants who had an early arterial pO2 in the ICE trial. Limitations include the possibility of residual confounding and other causal biases. Further work is warranted to confirm this relationship in the era of routine therapeutic hypothermia.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Victoria, Australia; Melbourne Children's Global Health, Murdoch Children's Research Institute, Melbourne, Victoria, Australia; Department of Paediatrics, The Mercy Hospital for Women, Heidelberg, Victoria, Australia; Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Melbourne, Victoria, Australia.
| | - Jeanie L Y Cheong
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Victoria, Australia; Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Melbourne, Victoria, Australia; Department of Paediatrics, The University of Melbourne, Melbourne, Victoria, Australia; Clinical Sciences, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Susan Donath
- Clinical Epidemiology and Biostatistics Unit, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Hamish Graham
- Melbourne Children's Global Health, Murdoch Children's Research Institute, Melbourne, Victoria, Australia; Department of Paediatrics, The University of Melbourne, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia; The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Graeme R Polglase
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia; The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Sue Jacobs
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Victoria, Australia; Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Melbourne, Victoria, Australia; Clinical Sciences, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Victoria, Australia; Department of Obstetrics, Gynaecology, and Newborn Health, The University of Melbourne, Melbourne, Victoria, Australia; Clinical Sciences, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| |
Collapse
|
4
|
Polglase GR, Brian Y, Tantanis D, Blank DA, Badurdeen S, Crossley KJ, Kluckow M, Gill AW, Camm E, Galinsky R, Thomas Songstad N, Klingenberg C, Hooper SB, Roberts CT. Endotracheal epinephrine at standard versus high dose for resuscitation of asystolic newborn lambs. Resuscitation 2024; 198:110191. [PMID: 38522732 DOI: 10.1016/j.resuscitation.2024.110191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/21/2024] [Accepted: 03/14/2024] [Indexed: 03/26/2024]
Abstract
INTRODUCTION Endotracheal (ET) epinephrine administration is an option during neonatal resuscitation, if the preferred intravenous (IV) route is unavailable. OBJECTIVES We assessed whether endotracheal epinephrine achieved return of spontaneous circulation (ROSC), and maintained physiological stability after ROSC, at standard and higher dose, in severely asphyxiated newborn lambs. METHODS Near-term fetal lambs were asphyxiated until asystole. Resuscitation was commenced with ventilation and chest compressions. Lambs were randomly allocated to: IV Saline placebo (5 ml/kg), IV Epinephrine (20 micrograms/kg), Standard-dose ET Epinephrine (100 micrograms/kg), and High-dose ET Epinephrine (1 mg/kg). After three allocated treatment doses, rescue IV Epinephrine was administered if ROSC had not occurred. Lambs achieving ROSC were monitored for 60 minutes. Brain histology was assessed for microbleeds. RESULTS ROSC in response to allocated treatment (without rescue IV Epinephrine) occurred in 1/6 Saline, 9/9 IV Epinephrine, 0/9 Standard-dose ET Epinephrine, and 7/9 High-dose ET Epinephrine lambs respectively. Blood pressure during CPR increased after treatment with IV Epinephrine and High-dose ET Epinephrine, but not Saline or Standard-dose ET Epinephrine. After ROSC, both ET Epinephrine groups had lower pH, higher lactate, and higher blood pressure than the IV Epinephrine group. Cortex microbleeds were more frequent in High-dose ET Epinephrine lambs (8/8 lambs examined, versus 3/8 in IV Epinephrine lambs). CONCLUSIONS The currently recommended dose of ET Epinephrine was ineffective in achieving ROSC. Without convincing clinical or preclinical evidence of efficacy, use of ET Epinephrine at this dose may not be appropriate. High-dose ET Epinephrine requires further evaluation before clinical translation.
Collapse
Affiliation(s)
- Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Yoveena Brian
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Darcy Tantanis
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia; Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Shiraz Badurdeen
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia; Newborn Research Centre, The Royal Women's Hospital, Melbourne, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Martin Kluckow
- Department of Neonatology, Royal North Shore Hospital & University of Sydney, Sydney, NSW, Australia
| | - Andrew W Gill
- Centre for Neonatal Research and Education, The University of Western Australia, Subiaco, WA, Australia
| | - Emily Camm
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | | | | | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Calum T Roberts
- The Ritchie Centre, Hudson Institute of Medical Research and Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia; Department of Paediatrics, Monash University, Melbourne, VIC, Australia; Monash Newborn, Monash Children's Hospital, Melbourne, VIC, Australia.
| |
Collapse
|
5
|
Horn-Oudshoorn EJJ, Vermeulen MJ, Knol R, Bout-Rebel R, Te Pas AB, Hooper SB, Otter SCMCD, Wijnen RMH, Crossley KJ, Rafat N, Schaible T, de Boode WP, Debeer A, Urlesberger B, Roberts CT, Kipfmueller F, Capolupo I, Burgos CM, Hansen BE, Reiss IKM, DeKoninck PLJ. Multicentre, randomised controlled trial of physiological-based cord clamping versus immediate cord clamping in infants with a congenital diaphragmatic hernia (PinC): statistical analysis plan. Trials 2024; 25:198. [PMID: 38509614 PMCID: PMC10953116 DOI: 10.1186/s13063-024-08027-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 03/01/2024] [Indexed: 03/22/2024] Open
Abstract
BACKGROUND Infants born with congenital diaphragmatic hernia (CDH) are at high risk of respiratory insufficiency and pulmonary hypertension. Routine practice includes immediate clamping of the umbilical cord and endotracheal intubation. Experimental animal studies suggest that clamping the umbilical cord guided by physiological changes and after the lungs have been aerated, named physiological-based cord clamping (PBCC), could enhance the fetal-to-neonatal transition in CDH. We describe the statistical analysis plan for the clinical trial evaluating the effects of PBCC versus immediate cord clamping on pulmonary hypertension in infants with CDH (PinC trial). DESIGN The PinC trial is a multicentre, randomised controlled trial in infants with isolated left-sided CDH, born ≥ 35.0 weeks of gestation. The primary outcome is the incidence of pulmonary hypertension in the first 24 h after birth. Maternal outcomes include estimated maternal blood loss. Neonatal secondary outcomes include mortality before discharge, extracorporeal membrane oxygenation therapy, and number of days of mechanical ventilation. Infants are 1:1 randomised to either PBCC or immediate cord clamping using variable random permutated block sizes (4-8), stratified by treatment centre and estimated severity of pulmonary hypoplasia (i.e. mild/moderate/severe). At least 140 infants are needed to detect a relative reduction in pulmonary hypertension by one third, with 80% power and 0.05 significance level. A chi-square test will be used to evaluate the hypothesis that PBCC decreases the occurrence of pulmonary hypertension. This plan is written and submitted without knowledge of the collected data. The trial has been ethically approved. TRIAL REGISTRATION ClinicalTrials.gov NCT04373902 (registered April 2020).
Collapse
Affiliation(s)
- Emily J J Horn-Oudshoorn
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Marijn J Vermeulen
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Ronny Knol
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Rebekka Bout-Rebel
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, the Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victory, Australia
| | - Suzan C M Cochius-den Otter
- Division of Paediatric Intensive Care, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Rene M H Wijnen
- Division of Paediatric Intensive Care, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victory, Australia
| | - Neysan Rafat
- Department of Neonatology, University Medical Center Mannheim, Mannheim, Germany
| | - Thomas Schaible
- Department of Neonatology, University Medical Center Mannheim, Mannheim, Germany
| | - Willem P de Boode
- Division of Neonatology, Department of Paediatrics, Radboudumc University Medical Center, Radboud Institute for Health Sciences, Amalia Children's Hospital, Nijmegen, The Netherlands
| | - Anne Debeer
- Department of Neonatology, University Hospitals Leuven, Leuven, Belgium
| | - Berndt Urlesberger
- Division of Neonatology, Department of Paediatrics and Adolescent Medicine, Medical University of Graz, Graz, Austria
| | - Calum T Roberts
- Department of Paediatrics, Monash University, Melbourne, Victoria, Australia
| | - Florian Kipfmueller
- Department of Neonatology and Paediatric Intensive Care Medicine, University of Bonn Children's Hospital, Bonn, Germany
| | - Irma Capolupo
- Department of Medical and Surgical Neonatology, Bambino Gesu Children's Hospital, IRCCS, Rome, Italy
| | - Carmen M Burgos
- Department of Paediatric Surgery, Karolinska University Hospital, Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | - Bettina E Hansen
- Department of Epidemiology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
- Institute of Health Policy, Management and Evaluation, University of Toronto, Toronto, Canada
- Toronto Centre for Liver Disease, University Health Network, Toronto, Canada
| | - Irwin K M Reiss
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Philip L J DeKoninck
- Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC University Medical Center, Rotterdam, the Netherlands.
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victory, Australia.
- Department of Obstetrics and Gynaecology, Erasmus MC University Medical Center, Rotterdam, the Netherlands.
| |
Collapse
|
6
|
Azman Z, Vidinopoulos K, Somers A, Hooper SB, Zahra VA, Thiel AM, Galinsky R, Tran NT, Allison BJ, Polglase GR. In utero ventilation induces lung parenchymal and vascular alterations in extremely preterm fetal sheep. Am J Physiol Lung Cell Mol Physiol 2024; 326:L330-L343. [PMID: 38252635 DOI: 10.1152/ajplung.00249.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 12/19/2023] [Accepted: 01/17/2024] [Indexed: 01/24/2024] Open
Abstract
Extremely preterm infants are often exposed to long durations of mechanical ventilation to facilitate gas exchange, resulting in ventilation-induced lung injury (VILI). New lung protective strategies utilizing noninvasive ventilation or low tidal volumes are now common but have not reduced rates of bronchopulmonary dysplasia. We aimed to determine the effect of 24 h of low tidal volume ventilation on the immature lung by ventilating preterm fetal sheep in utero. Preterm fetal sheep at 110 ± 1(SD) days' gestation underwent sterile surgery for instrumentation with a tracheal loop to enable in utero mechanical ventilation (IUV). At 112 ± 1 days' gestation, fetuses received either in utero mechanical ventilation (IUV, n = 10) targeting 3-5 mL/kg for 24 h, or no ventilation (CONT, n = 9). At necropsy, fetal lungs were collected to assess molecular and histological markers of lung inflammation and injury. IUV significantly increased lung mRNA expression of interleukin (IL)-1β, IL-6, IL-8, IL-10, and tumor necrosis factor (TNF) compared with CONT, and increased surfactant protein (SP)-A1, SP-B, and SP-C mRNA expression compared with CONT. IUV produced modest structural changes to the airways, including reduced parenchymal collagen and myofibroblast density. IUV increased pulmonary arteriole thickness compared with CONT but did not alter overall elastin or collagen content within the vasculature. In utero ventilation of an extremely preterm lung, even at low tidal volumes, induces lung inflammation and injury to the airways and vasculature. In utero ventilation may be an important model to isolate the confounding mechanisms of VILI to develop effective therapies for preterm infants requiring prolonged respiratory support.NEW & NOTEWORTHY Preterm infants often require prolonged respiratory support, but the relative contribution of ventilation to the development of lung injury is difficult to isolate. In utero mechanical ventilation allows for mechanistic investigations into ventilation-induced lung injury without confounding factors associated with sustaining extremely preterm lambs ex utero. Twenty-four hours of in utero ventilation, even at low tidal volumes, increased lung inflammation and surfactant protein expression and produced structural changes to the lung parenchyma and vasculature.
Collapse
Affiliation(s)
- Zahrah Azman
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Kayla Vidinopoulos
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Ainsley Somers
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Valerie A Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Alison M Thiel
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Nhi T Tran
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Beth J Allison
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| |
Collapse
|
7
|
Diedericks C, Crossley KJ, Davies IM, Riddington PJ, Cannata ER, Martinez OL, Thiel AM, Te Pas AB, Hooper SB. Influence of the chest wall on respiratory function at birth in near-term lambs. J Appl Physiol (1985) 2024; 136:630-642. [PMID: 38328823 DOI: 10.1152/japplphysiol.00496.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 01/29/2024] [Indexed: 02/09/2024] Open
Abstract
Airway liquid is cleared into lung tissue after birth, which becomes edematous and forces the chest wall to expand to accommodate both the cleared liquid and incoming air. This study investigated how changing chest wall mechanics affects respiratory function after birth in near-term lambs with different airway liquid volumes. Surgically instrumented near-term lambs (139 ± 2 days) were randomized into Control (n = 7) or Elevated Liquid (EL; n = 6) groups. Control lambs had lung liquid drained to simulate expected volumes following vaginal delivery. EL lambs had airway liquid drained and 30 mL/kg liquid returned to simulate expected airway liquid volumes after elective cesarean section. Lambs were delivered, transferred to a Perspex box, and ventilated (30 min). Pressure in the box was adjusted to apply positive (7-8 cmH2O above atmospheric pressure) or negative (7-8 cmH2O below atmospheric pressure) pressures for 30 min before pressures were reversed. External negative pressures expanded the chest wall, reduced chest wall compliance (CCW) and increased lung compliance (CL) in Control and EL lambs. External positive pressures compressed the chest wall, increased CCW and reduced CL in Control and EL lambs. External negative pressure improved pulmonary oxygen exchange, reducing the alveolar-arterial difference in oxygen (AaDO2) by 69 mmHg (95% CI [13, 125]; P = 0.016) in Control lambs and by 300 mmHg (95% CI [233, 367]; P < 0.001) in EL lambs. In contrast, external positive pressures impaired pulmonary gas exchange, increasing the AaDO2 by 179 mmHg (95% CI [73, 285]; P = 0.002) in Control and by 215 mmHg (95% CI [89, 343]; P < 0.001) in EL lambs. The application of external thoracic pressures influences respiratory function after birth.NEW & NOTEWORTHY This study investigated how changes in chest wall mechanics influence respiratory function after birth. Our data indicate that the application of continuous external subatmospheric pressure greatly improves respiratory function in near-term lambs with respiratory distress, whereas external positive pressures impair respiratory function. Our findings indicate that, during neonatal resuscitation at birth, the forces applied to the chest wall should not be ignored as they can have a major impact on neonatal respiratory function.
Collapse
Affiliation(s)
- Cailin Diedericks
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Indya M Davies
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Paige J Riddington
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Ebony R Cannata
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Olivia L Martinez
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Alison M Thiel
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| |
Collapse
|
8
|
Cramer SJE, Dekker J, Croughan MK, Lee KL, Crossley KJ, McGillick EV, Martherus T, Thio M, Wallace MJ, Kitchen MJ, Hooper SB, Te Pas AB. The effect of vibrotactile stimulation on hypoxia-induced irregular breathing and apnea in preterm rabbits. Pediatr Res 2024:10.1038/s41390-024-03061-2. [PMID: 38356025 DOI: 10.1038/s41390-024-03061-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 12/22/2023] [Accepted: 12/29/2023] [Indexed: 02/16/2024]
Abstract
BACKGROUND Manual tactile stimulation is used to counteract apnea in preterm infants, but it is unknown when this intervention should be applied. We compared an anticipatory to a reactive approach using vibrotactile stimulation to prevent hypoxia induced apneas. METHODS Preterm rabbit kittens were prematurely delivered and randomized to either group. All kittens breathed spontaneously with a positive airway pressure of 8 cmH2O while they were imaged using phase contrast X-ray. Irregular breathing (IB) was induced using gradual hypoxia. The anticipatory group received stimulation at the onset of IB and the reactive group if IB transitioned into apnea. Breathing rate (BR), heart rate (HR) and functional residual capacity (FRC) were compared. RESULTS Anticipatory stimulation significantly reduced apnea incidence and maximum inter-breath intervals and increased BR following IB, compared to reactive stimulation. Recovery in BR but not HR was more likely with anticipatory stimulation, although both BR and HR were significantly higher at 120 s after stimulation onset. FRC values and variability were not different. CONCLUSIONS Anticipated vibrotactile stimulation is more effective in preventing apnea and enhancing breathing when compared to reactive stimulation in preterm rabbits. Stimulation timing is likely to be a key factor in reducing the incidence and duration of apnea. IMPACT Anticipated vibrotactile stimulation can prevent apnea and stimulate breathing effort in preterm rabbits. Anticipated vibrotactile stimulation increases the likelihood of breathing rate recovery following hypoxia induced irregular breathing, when compared to reactive stimulation. Automated stimulation in combination with predictive algorithms may improve the treatment of apnea in preterm infants.
Collapse
Affiliation(s)
- Sophie J E Cramer
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, Leiden, the Netherlands.
| | - Janneke Dekker
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, Leiden, the Netherlands
| | - Michelle K Croughan
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
| | - Katie L Lee
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
- School of Earth and Environmental Science, University of Queensland, Brisbane, QLD, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynecology, Monash University, Melbourne, VIC, Australia
| | - Erin V McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynecology, Monash University, Melbourne, VIC, Australia
| | - Tessa Martherus
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, Leiden, the Netherlands
| | - Martha Thio
- Women's Newborn Research Centre, The Royal Women's Hospital, Melbourne, VIC, Australia
- Centre of Research Excellence in Newborn Medicine, Murdoch Children's Research Institute, Melbourne, VIC, Australia
- Department of Obstetrics and Gynecology, University of Melbourne, Melbourne, VIC, Australia
| | - Megan J Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynecology, Monash University, Melbourne, VIC, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynecology, Monash University, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, Leiden, the Netherlands
| |
Collapse
|
9
|
Hadley L, Flemmer AW, Kitchen MJ, Croughan MK, Crossley KJ, Lee KL, McGillick E, Wallace MJ, Pearson JT, DeKoninck P, Hodges R, Te Pas AB, Hooper SB, Thio M. Sustained inflation improves initial lung aeration in newborn rabbits with a diaphragmatic hernia. Pediatr Res 2024; 95:660-667. [PMID: 37952056 DOI: 10.1038/s41390-023-02874-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 10/06/2023] [Accepted: 10/12/2023] [Indexed: 11/14/2023]
Abstract
BACKGROUND Infants with a congenital diaphragmatic hernia (DH) have underdeveloped lungs and require mechanical ventilation after birth, but the optimal approach is unknown. We hypothesised that sustained inflation (SI) increases lung aeration in newborn kittens with a DH. METHODS In pregnant New Zealand white rabbits, a left-sided DH was induced in two fetal kittens per doe at 24-days gestation (term = 32 days); litter mates acted as controls. DH and control kittens were delivered by caesarean section at 30 days, intubated and mechanically ventilated (7-10 min) with either an SI followed by intermittent positive pressure ventilation (IPPV) or IPPV throughout. The rate and uniformity of lung aeration was measured using phase-contrast X-ray imaging. RESULTS Lung weights in DH kittens were ~57% of controls. An SI increased the rate and uniformity of lung aeration in DH kittens, compared to IPPV, and increased dynamic lung compliance in both control and DH kittens. However, this effect of the SI was lost when ventilation changed to IPPV. CONCLUSION While an SI improved the rate and uniformity of lung aeration in both DH and control kittens, greater consideration of the post-SI ventilation strategy is required to sustain this benefit. IMPACT Compared to intermittent positive pressure ventilation (IPPV), an initial sustained inflation (SI) increased the rate and uniformity of lung aeration after birth. However, this initial benefit is rapidly lost following the switch to IPPV. The optimal approach for ventilating CDH infants at birth is unknown. While an SI improves lung aeration in immature lungs, its effect on the hypoplastic lung is unknown. This study has shown that an SI greatly improves lung aeration in the hypoplastic lung. This study will guide future studies examining whether an SI can improve lung aeration in infants with a CDH.
Collapse
Affiliation(s)
- Lauren Hadley
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Andreas W Flemmer
- Division of Neonatology, University Children's Hospital and Perinatal Center, LMU Hospital, Munich, Germany
| | - Marcus J Kitchen
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
| | - Michelle K Croughan
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
| | - Kelly J Crossley
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Katie L Lee
- School of Physics and Astronomy, Monash University, Melbourne, VIC, Australia
| | - Erin McGillick
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Megan J Wallace
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - James T Pearson
- National Cerebral and Cardiovascular Center, Suita, Japan
- Department of Physiology, Victoria Heart Institute and Monash Biomedicine Institute, Monash University, Melbourne, VIC, Australia
| | - Philip DeKoninck
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Division of Obstetrics and Fetal Medicine, Erasmus MC University Medical Center - Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Ryan Hodges
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Willem Alexander Children's Hospital, Leiden University Medical Center, Leiden, The Netherlands
| | - Stuart B Hooper
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia.
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia.
| | - Marta Thio
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, VIC, Australia
- The Murdoch Children's Research Institute, Melbourne, VIC, Australia
| |
Collapse
|
10
|
Heesters V, Dekker J, Panneflek TJ, Kuypers KL, Hooper SB, Visser R, Te Pas AB. The vocal cords are predominantly closed in preterm infants <30 weeks gestation during transition after birth; an observational study. Resuscitation 2024; 194:110053. [PMID: 37979668 DOI: 10.1016/j.resuscitation.2023.110053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/06/2023] [Accepted: 11/12/2023] [Indexed: 11/20/2023]
Abstract
AIM Studies in animals have shown that vocal cords (VCs) close during apnoea before and after birth, thereby impairing the effect of non-invasive ventilation. We tested the feasibility of visualising VCs using ultrasonography (US) and investigated the position and movement of the VCs during non-invasive respiratory support of preterm infants at birth. METHODS In an observational study, VCs were visualised using US in infants <30 weeks gestation during both stabilisation after birth and at one hour after birth. Respiratory efforts were simultaneously recorded. The percentage of time the VCs were closed in the first ten minutes was determined from videoframes acquired at 15 Hz and compared with respiratory flow patterns measured using a respiratory function monitor. RESULTS US of the VCs could be performed in 20/20 infants included (median (IQR) gestational age 27+6 (27+1-28+6) weeks) without interfering with stabilisation, of whom 60% (12/20) were initially breathing and 40% (8/20) were apnoeic at birth. In breathing infants, the VCs closed between breaths and during breath holds, which accounted for 57% (49-66) of the time. In apnoeic infants receiving positive pressure ventilation, the VCs were closed for 93% (81-99) of the time. US at one hour after birth could be performed in 14/20 infants, VCs were closed between breaths and during breath holds, accounting for 46% (27-52) of the time. CONCLUSION Visualising VCs in preterm infants at birth using US is feasible. The VCs were closed during apnoea, in between breaths and during breath holds, impairing the effect of ventilation given.
Collapse
Affiliation(s)
- Veerle Heesters
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands.
| | - Janneke Dekker
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands
| | - Timothy Jr Panneflek
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands
| | - Kristel Lam Kuypers
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia; Department of Obstetrics and Gynecology, Monash University, Melbourne, VIC, Australia
| | - Remco Visser
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands
| | - Arjan B Te Pas
- Willem-Alexander Children's Hospital, Department of Pediatrics, Division of Neonatology, Leiden University Medical Center, the Netherlands
| |
Collapse
|
11
|
Kuypers KLAM, Cramer SJE, Dekker J, Visser R, Hooper SB, Te Pas AB. Exerted force on the face mask in preterm infants at birth is associated with apnoea and bradycardia. Resuscitation 2024; 194:110086. [PMID: 38097106 DOI: 10.1016/j.resuscitation.2023.110086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/05/2023] [Accepted: 12/06/2023] [Indexed: 12/24/2023]
Abstract
BACKGROUND During stabilisation of preterm infants at birth, a face mask is used to provide respiratory support. However, application of these masks may activate cutaneous stretch receptors of the trigeminal nerve, causing apnoea and bradycardia. This study investigated the amount of force exerted on the face mask during non-invasive ventilation of preterm infants at birth and whether the amount of exerted force is associated with apnoea and bradycardia. METHODS A prospective observational study was performed in preterm infants born <32 weeks of gestation who were stabilised at birth. During the first 10 minutes of respiratory support, we measured breathing and heart rate as well as the amount of force exerted on a face mask using a custom-made pressure sensor placed on top of the face mask. RESULTS Thirty infants were included (median (IQR) gestational age(GA) 28+3 (27+0-30+0) weeks, birthweight 1104 (878-1275) grams). The median exerted force measured was 297 (198-377) grams, ranging from 0 to 1455 grams. Significantly more force was exerted on the face mask during positive pressure ventilation when compared to CPAP (410 (256-556) vs 286 (190-373) grams, p = 0.009). In a binary logistic regression model, higher forces were associated with an increased risk of apnoea (OR = 1.607 (1.556-1.661), p < 0.001) and bradycardia (OR = 1.140 (1.102-1.180), p < 0.001) during the first 10 minutes of respiratory support at birth. CONCLUSION During mask ventilation, the median exerted force on a face mask was 297 grams with a maximum of 1455 grams. Higher exerted forces were associated apnoea and bradycardia during the first 10 minutes of respiratory support at birth.
Collapse
Affiliation(s)
- K L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands.
| | - S J E Cramer
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - J Dekker
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - R Visser
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - S B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia; Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - A B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| |
Collapse
|
12
|
Polglase GR, Hwang C, Blank DA, Badurdeen S, Crossley KJ, Kluckow M, Gill AW, Camm E, Galinsky R, Brian Y, Hooper SB, Roberts CT. Assessing the influence of abdominal compression on time to return of circulation during resuscitation of asphyxiated newborn lambs: a randomised preclinical study. Arch Dis Child Fetal Neonatal Ed 2023:fetalneonatal-2023-326047. [PMID: 38123977 DOI: 10.1136/archdischild-2023-326047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023]
Abstract
OBJECTIVE During neonatal resuscitation, the return of spontaneous circulation (ROSC) can be achieved using epinephrine which optimises coronary perfusion by increasing diastolic pressure. Abdominal compression (AC) applied during resuscitation could potentially increase diastolic pressure and therefore help achieve ROSC. We assessed the use of AC during resuscitation of asystolic newborn lambs, with and without epinephrine. METHODS Near-term fetal lambs were instrumented for physiological monitoring and after delivery, asphyxiated until asystole. Resuscitation was commenced with ventilation followed by chest compressions. Lambs were randomly allocated to: intravenous epinephrine (20 µg/kg, n=9), intravenous epinephrine+continuous AC (n=8), intravenous saline placebo (5 mL/kg, n=6) and intravenous saline+AC (n=9). After three allocated treatment doses, rescue intravenous epinephrine was administered if ROSC had not occurred. Time to achieve ROSC was the primary outcome. Lambs achieving ROSC were ventilated and monitored for 60 min before euthanasia. Brain histology was assessed for micro-haemorrhage. RESULTS Use of AC did not influence mean time to achieve ROSC (epinephrine lambs 177 s vs epinephrine+AC lambs 179 s, saline lambs 602 s vs saline+AC lambs 585 s) or rate of ROSC (nine of nine lambs, eight of eight lambs, one of six lambs and two of eight lambs, respectively). Application of AC was associated with higher diastolic blood pressure (mean value >10 mm Hg), mean and systolic blood pressure and carotid blood flow during resuscitation. Cortex and deep grey matter micro-haemorrhage was more frequent in AC lambs. CONCLUSION Use of AC during resuscitation increased diastolic blood pressure, but did not impact time to ROSC.
Collapse
Affiliation(s)
- Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Colin Hwang
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Paediatrics, Monash University, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
| | - Shiraz Badurdeen
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Newborn Research Centre, The Royal Women's Hospital, Parkville, Victoria, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Martin Kluckow
- Department of Neonatology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Andrew W Gill
- Centre for Neonatal Research and Education, University of Western Australia, Perth, Western Australia, Australia
| | - Emily Camm
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Yoveena Brian
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Calum T Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Paediatrics, Monash University, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
| |
Collapse
|
13
|
Kuypers KLAM, Kashyap AJ, Cramer SJE, Hooper SB, Te Pas AB. The effect of imposed resistance in neonatal resuscitators on pressure stability and peak flows: a bench test. Pediatr Res 2023; 94:1929-1934. [PMID: 37460710 DOI: 10.1038/s41390-023-02715-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 06/01/2023] [Accepted: 06/14/2023] [Indexed: 11/24/2023]
Abstract
BACKGROUND The importance of neonatal resuscitator resistance is currently unknown. In this study we investigated peak flows and pressure stability resulting from differences in imposed resistance during positive pressure ventilation(PPV) and simulated spontaneous breathing (SSB) between the r-PAP, low-resistance resuscitator, and Neopuff™, high-resistance resuscitator. METHODS In a bench test, 20 inflations during PPV and 20 breaths during SSB were analysed on breath-by-breath basis to determine peak flow and pressure stability using the Neopuff™ with bias gas flow of 8, 12 or 15 L/min and the r-PAP with total gas flow of 15 L/min. RESULTS Imposed resistance of the Neopuff™ was significantly reduced when the bias gas flow was increased from 8 to 15 L/min, which resulted in higher peak flows during PPV and SSB. Peak flows in the r-PAP were, however, significantly higher and fluctuations in CPAP during SSB were significantly smaller in the r-PAP compared to the Neopuff™ for all bias gas flow levels. During PPV, a pressure overshoot of 3.2 cmH2O was observed in the r-PAP. CONCLUSIONS The r-PAP seemed to have a lower resistance than the Neopuff™ even when bias gas flows were increased. This resulted in more stable CPAP pressures with higher peak flows when using the r-PAP. IMPACT The traditional T-piece system (Neopuff™) has a higher imposed resistance compared to a new neonatal resuscitator (r-PAP). This study shows that reducing imposed resistance leads to smaller CPAP fluctuations and higher inspiratory and expiratory peak flows. High peak flows might negatively affect lung function and/or cause lung injury in preterm infants at birth. This study will form the rationale for further studies investigating these effects. A possible compromise might be to use the traditional T-piece system with a higher bias gas flow (12 L/min), thereby reducing the imposed resistance and generating more stable PEEP/CPAP pressures, while limiting potentially harmful peak flows.
Collapse
Affiliation(s)
- Kristel L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands.
| | - Aidan J Kashyap
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Sophie J E Cramer
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| |
Collapse
|
14
|
Oyang M, Piscopo BR, Zahra V, Malhotra A, Sutherland AE, Sehgal A, Hooper SB, Miller SL, Polglase GR, Allison BJ. Cardiovascular responses to mild perinatal asphyxia in growth-restricted preterm lambs. Am J Physiol Heart Circ Physiol 2023; 325:H1081-H1087. [PMID: 37656131 PMCID: PMC10908401 DOI: 10.1152/ajpheart.00485.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 08/29/2023] [Accepted: 08/30/2023] [Indexed: 09/02/2023]
Abstract
Growth-restricted neonates have worse outcomes after perinatal asphyxia, with more severe metabolic acidosis than appropriately grown neonates. The cardiovascular physiology associated with fetal growth restriction (FGR) may alter their response to asphyxia. However, research on asphyxia in FGR is limited. Here we compared cardiovascular hemodynamics in preterm FGR and control lambs during mild perinatal asphyxia. We induced FGR in one twin at 89 days gestation (term 148 days), while the other served as a control. At 126 days gestation, lambs were instrumented to allow arterial blood pressure and regional blood flow recording, and then mild perinatal asphyxia was induced by umbilical cord clamping, and resuscitation followed neonatal guidelines. FGR lambs maintained carotid blood flow (CBF) for 7 min, while control lambs rapidly decreased CBF (P < 0.05). Fewer growth-restricted lambs needed chest compressions for return of spontaneous circulation (ROSC) (17 vs. 83%, P = 0.02). The extent of blood pressure overshoot after ROSC was similar, but it took longer for MAP to return to baseline in FGR lambs (18.83 ± 0.00 vs. 47.67 ± 0.00 min, P = 0.003). Growth-restricted lambs had higher CBF after ROSC (P < 0.05) and displayed CBF overshoot, unlike control lambs (P < 0.03). In conclusion, preterm growth-restricted lambs show resilience during perinatal asphyxia based on prolonged CBF maintenance and reduced need for chest compressions during resuscitation. However, CBF overshoot after ROSC may increase the risk of cerebrovascular injury in FGR.NEW & NOTEWORTHY Preterm growth-restricted lambs maintain carotid blood flow for longer than control lambs during asphyxia and have a lower requirement for chest compressions than control lambs during resuscitation. Preterm growth-restricted, but not control, lambs displayed an overshoot in carotid blood flow following return of spontaneous circulation.
Collapse
Affiliation(s)
- Matthew Oyang
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Beth R Piscopo
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Valerie Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Atul Malhotra
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
- Department of Paediatrics, Monash University, Clayton, Victoria, Australia
| | - Amy E Sutherland
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Arvind Sehgal
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
- Department of Paediatrics, Monash University, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Suzanne L Miller
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Beth J Allison
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| |
Collapse
|
15
|
Kuypers KLAM, Hopman A, Cramer SJE, Dekker J, Visser R, Hooper SB, Te Pas AB. Effect of initial and subsequent mask applications on breathing and heart rate in preterm infants at birth. Arch Dis Child Fetal Neonatal Ed 2023; 108:594-598. [PMID: 37080734 DOI: 10.1136/archdischild-2022-324835] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 03/29/2023] [Indexed: 04/22/2023]
Abstract
OBJECTIVE Application of a face mask may provoke the trigeminocardiac reflex, leading to apnoea and bradycardia. This study investigates whether re-application of a face mask in preterm infants at birth alters the risk of apnoea compared with the initial application, and identify factors that influence this risk. METHODS Resuscitation videos and respiratory function monitor data collected from preterm infants <30 weeks gestation between 2018 and 2020 were reviewed. Breathing and heart rate before and after the initial and subsequent mask applications were analysed. RESULTS In total, 111 infants were included with 404 mask applications (102 initial and 302 subsequent mask applications). In 254/404 (63%) applications, infants were breathing prior to mask application, followed by apnoea after 67/254 (26%) mask applications. Apnoea and bradycardia occurred significantly more often after the initial mask application compared with subsequent applications (apnoea initial: 32/67 (48%) and subsequent: 44/187 (24%), p<0.001; bradycardia initial: 61% and subsequent 21%, p<0.001). Apnoea was followed by bradycardia in 73% and 71% of the initial and subsequent mask applications, respectively (p=0.607).In a logistic regression model, a lower breathing rate (OR 0.908 (95% CI 0.847 to 0.974), p=0.007) and heart rate (OR 0.935 (95% CI 0.901 to 0.970), p<0.001) prior to mask application were associated with an increased likelihood of becoming apnoeic following subsequent mask applications. CONCLUSION In preterm infants at birth, apnoea and bradycardia occurs more often after an initial mask application than subsequent applications, with lower heart and breathing rates increasing the risk of apnoea in subsequent applications.
Collapse
Affiliation(s)
- Kristel L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Anouk Hopman
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Sophie J E Cramer
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Janneke Dekker
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Remco Visser
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, The Hudson Institute for Medical Research, Clayton, Victoria, Australia
- Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| |
Collapse
|
16
|
Badurdeen S, Brooijmans E, Blank DA, Kuypers KLAM, Te Pas AB, Roberts C, Polglase GR, Hooper SB, Davis PG. Heart Rate Changes following Facemask Placement in Infants Born at ≥32+0 Weeks of Gestation. Neonatology 2023; 120:624-632. [PMID: 37531947 DOI: 10.1159/000531739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 06/23/2023] [Indexed: 08/04/2023]
Abstract
INTRODUCTION Recent reports have raised concerns of cardiorespiratory deterioration in some infants receiving respiratory support at birth. We aimed to independently determine whether respiratory support with a facemask is associated with a decrease in heart rate (HR) in some late-preterm and term infants. METHODS Secondary analysis of data from infants born at ≥32+0 weeks of gestation at 2 perinatal centres in Melbourne, Australia. Change in HR up to 120 s after facemask placement, measured using 3-lead electrocardiography, was assessed every 3 s until 60 s and every 5 s thereafter from video recordings. RESULTS In the 15 s after facemask placement, 10/68 (15%) infants had a decrease in mean HR by >10 beats per minute (bpm) compared with their individual baseline mean HR in the 15 s before facemask placement. In 4 (6%) infants, HR decreased to <100 bpm. Nine out of 68 (13%) infants had an increase in mean HR by >10 bpm; 7 of these infants had a baseline HR <120 bpm. In univariable comparisons, the following characteristics were found not to be risk factors for a decrease in HR by >10 bpm: prematurity; type of respiratory support; hypoxaemia; early cord clamping; mode of birth; HR <120 bpm before mask placement. Six out of 63 infants (10%) who had HR ≥120 bpm after facemask placement had a late decrease in HR to <100 bpm between 30 and 120 s after facemask placement. CONCLUSION Facemask respiratory support at birth is temporally associated with a decrease in HR in a subset of late-preterm and term infants.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Newborn Research Centre, The Royal Women's Hospital, Parkville, Victoria, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
- Department of Paediatrics, Mercy Hospital for Women, Melbourne, Victoria, Australia
| | - Elisa Brooijmans
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
| | - Kristel Leontina Anne Marie Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, The Netherlands
| | - Calum Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
- Monash Newborn, Monash Children's Hospital, Clayton, Victoria, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre, The Royal Women's Hospital, Parkville, Victoria, Australia
- Neonatal Research, Murdoch Children's Research Institute, Parkville, Victoria, Australia
- Department of Obstetrics and Gynaecology, The University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
17
|
Kelly SB, Dean JM, Zahra VA, Dudink I, Thiel A, Polglase GR, Miller SL, Hooper SB, Bennet L, Gunn AJ, Galinsky R. Progressive inflammation reduces high-frequency EEG activity and cortical dendritic arborisation in late gestation fetal sheep. J Neuroinflammation 2023; 20:124. [PMID: 37226206 DOI: 10.1186/s12974-023-02805-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 05/15/2023] [Indexed: 05/26/2023] Open
Abstract
BACKGROUND Antenatal infection/inflammation is associated with disturbances in neuronal connectivity, impaired cortical growth and poor neurodevelopmental outcomes. The pathophysiological substrate that underpins these changes is poorly understood. We tested the hypothesis that progressive inflammation in late gestation fetal sheep would alter cortical neuronal microstructure and neural function assessed using electroencephalogram band power analysis. METHODS Fetal sheep (0.85 of gestation) were surgically instrumented for continuous electroencephalogram (EEG) recording and randomly assigned to repeated saline (control; n = 9) or LPS (0 h = 300 ng, 24 h = 600 ng, 48 h = 1200 ng; n = 8) infusions to induce inflammation. Sheep were euthanised 4 days after the first LPS infusion for assessment of inflammatory gene expression, histopathology and neuronal dendritic morphology in the somatosensory cortex. RESULTS LPS infusions increased delta power between 8 and 50 h, with reduced beta power from 18 to 96 h (P < 0.05 vs. control). Basal dendritic length, numbers of dendritic terminals, dendritic arborisation and numbers of dendritic spines were reduced in LPS-exposed fetuses (P < 0.05 vs. control) within the somatosensory cortex. Numbers of microglia and interleukin (IL)-1β immunoreactivity were increased in LPS-exposed fetuses compared with controls (P < 0.05). There were no differences in total numbers of cortical NeuN + neurons or cortical area between the groups. CONCLUSIONS Exposure to antenatal infection/inflammation was associated with impaired dendritic arborisation, spine number and loss of high-frequency EEG activity, despite normal numbers of neurons, that may contribute to disturbed cortical development and connectivity.
Collapse
Affiliation(s)
- Sharmony B Kelly
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Justin M Dean
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Valerie A Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
| | - Ingrid Dudink
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Alison Thiel
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Suzanne L Miller
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Laura Bennet
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Alistair J Gunn
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright Street, Melbourne, VIC, 3168, Australia.
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia.
| |
Collapse
|
18
|
Santomartino GA, Blank DA, Heng A, Woodward A, Kane SC, Thio M, Polglase GR, Hooper SB, Davis PG, Badurdeen S. Perinatal predictors of clinical instability at birth in late-preterm and term infants. Eur J Pediatr 2023; 182:987-995. [PMID: 36418782 PMCID: PMC10023598 DOI: 10.1007/s00431-022-04684-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/22/2022] [Accepted: 10/28/2022] [Indexed: 11/25/2022]
Abstract
To identify characteristics associated with delivery room clinical instability in at-risk infants. Prospective cohort study. Two perinatal centres in Melbourne, Australia. Infants born at ≥ 35+0 weeks' gestation with a first-line paediatric doctor requested to attend. Clinical instability defined as any one of heart rate < 100 beats per minute for ≥ 20 s in the first 10 min after birth, maximum fraction of inspired oxygen of ≥ 0.70 in the first 10 min after birth, 5-min Apgar score of < 7, intubated in the delivery room or admitted to the neonatal unit for respiratory support. Four hundred and seventy-three infants were included. The median (IQR) gestational age at birth was 39+4 (38+4-40+4) weeks. Eighty (17%) infants met the criteria for clinical instability. Independent risk factors for clinical instability were labour without oxytocin administration, presence of a medical pregnancy complication, difficult extraction at birth and unplanned caesarean section in labour. Decision tree analysis determined that infants at highest risk were those whose mothers did not receive oxytocin during labour (25% risk). Infants at lowest risk were those whose mothers received oxytocin during labour and did not have a medical pregnancy complication (7% risk). CONCLUSIONS We identified characteristics associated with clinical instability that may be useful in alerting less experienced clinicians to call for senior assistance early. The decision trees provide intuitive visual aids but require prospective validation. WHAT IS KNOWN • First-line clinicians attending at-risk births may need to call senior colleagues for assistance depending on the infant's condition. • Delays in effectively supporting a compromised infant at birth is an important cause of neonatal morbidity and infant-mother separation. WHAT IS NEW • This study identifies risk factors for delivery room clinical instability in at-risk infants born at ≥ 35+0 weeks' gestation. • The decision trees presented provide intuitive visual tools to aid in determining the need for senior paediatric presence.
Collapse
Affiliation(s)
- Georgia A Santomartino
- Newborn Research Centre, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, 3052, Australia.
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright St, Clayton, VIC, Australia
- Department of Paediatrics, Monash University, Wellington Rd, Clayton, VIC, Australia
- Monash Newborn, Monash Children's Hospital, 246 Clayton Rd, Clayton, VIC, Australia
| | - Alissa Heng
- Faculty of Medicine, Nursing and Health Sciences, Monash University, 27 Rainforest Walk, Clayton, VIC, Australia
| | - Anthony Woodward
- Division of Maternity Services, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, Australia
| | - Stefan C Kane
- Division of Maternity Services, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, Australia
- Department of Maternal Fetal Medicine, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, Australia
- Department of Obstetrics and Gynaecology, The University of Melbourne, Parkville, VIC, Australia
| | - Marta Thio
- Newborn Research Centre, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, 3052, Australia
- Department of Obstetrics and Gynaecology, The University of Melbourne, Parkville, VIC, Australia
- Clinical Sciences Research, Murdoch Children's Research Institute, Flemington Rd, Parkville, VIC, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright St, Clayton, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright St, Clayton, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC, Australia
| | - Peter G Davis
- Newborn Research Centre, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, 3052, Australia
- Department of Obstetrics and Gynaecology, The University of Melbourne, Parkville, VIC, Australia
- Clinical Sciences Research, Murdoch Children's Research Institute, Flemington Rd, Parkville, VIC, Australia
| | - Shiraz Badurdeen
- Newborn Research Centre, The Royal Women's Hospital, 20 Flemington Rd, Parkville, VIC, 3052, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright St, Clayton, VIC, Australia
| |
Collapse
|
19
|
Stainsby AV, DeKoninck PLJ, Crossley KJ, Thiel A, Wallace MJ, Pearson JT, Kashyap AJ, Croughan MK, Allison BA, Hodges R, Thio M, Flemmer AW, McGillick EV, Te Pas AB, Hooper SB, Kitchen MJ. Effect of prenatal diaphragmatic hernia on pulmonary arterial morphology. Anat Rec (Hoboken) 2023. [PMID: 36688449 DOI: 10.1002/ar.25159] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 10/28/2022] [Accepted: 12/19/2022] [Indexed: 01/24/2023]
Abstract
Congenital diaphragmatic hernia (CDH) is a major cause of severe lung hypoplasia and pulmonary hypertension in the newborn. While the pulmonary hypertension is thought to result from abnormal vascular development and arterial vasoreactivity, the anatomical changes in vascular development are unclear. We have examined the 3D structure of the pulmonary arterial tree in rabbits with a surgically induced diaphragmatic hernia (DH). Fetal rabbits (n = 6) had a left-sided DH created at gestational day 23 (GD23), delivered at GD30, and briefly ventilated; sham-operated litter mates (n = 5) acted as controls. At postmortem the pulmonary arteries were filled with a radio-opaque resin before the lungs were scanned using computed tomography (CT). The 3D reconstructed images were analyzed based on vascular branching hierarchy using the software Avizo 2020.2. DH significantly reduced median number of arteries (2,579 (8440) versus 576 (442), p = .017), artery numbers per arterial generation, mean total arterial volume (43.5 ± 8.4 vs. 19.9 ± 3.1 μl, p = .020) and mean total arterial cross-sectional area (82.5 ± 2.3 vs. 28.2 ± 6.2 mm2 , p =.036). Mean arterial radius was increased in DH kittens between the eighth and sixth branching generation and mean arterial length between the sixth and 28th branching generation. A DH in kittens resulted in threefold reduction in pulmonary arterial cross-sectional area, primarily due to reduced arterial branching. Thus, the reduction in arterial cross-sectional area could be a major contributor to pulmonary hypertension infants with CDH.
Collapse
Affiliation(s)
- Andrew V Stainsby
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Philip L J DeKoninck
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Division of Obstetrics and Fetal Medicine, Department of Obstetrics and Gynaecology, Erasmus MC University Medical Center - Sophia Children's Hospital, Rotterdam, The Netherlands
| | - Kelly J Crossley
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Alison Thiel
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
| | - Megan J Wallace
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - James T Pearson
- National Cerebral and Cardiovascular Center, Suita, Japan
- Department of Physiology, Victoria Heart Institute and Monash Biomedicine Institute, Monash University, Melbourne, Australia
| | - Aidan J Kashyap
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | | | - Beth A Allison
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Ryan Hodges
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Marta Thio
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Australia
- The Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, Australia
| | - Andreas W Flemmer
- Division of Neonatology Dr. von Hauner Children's Hospital and Perinatal Center, LMU University Hospital, Munich, Germany
| | - Erin V McGillick
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Stuart B Hooper
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Marcus J Kitchen
- Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- School of Physics and Astronomy, Monash University, Melbourne, Australia
| |
Collapse
|
20
|
Chakkarapani AA, Roehr CC, Hooper SB, Te Pas AB, Gupta S. Transitional circulation and hemodynamic monitoring in newborn infants. Pediatr Res 2023:10.1038/s41390-022-02427-8. [PMID: 36593283 DOI: 10.1038/s41390-022-02427-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 11/14/2022] [Accepted: 11/21/2022] [Indexed: 01/03/2023]
Abstract
Transitional circulation is normally transient after birth but can vary markedly between infants. It is actually in a state of transition between fetal (in utero) and neonatal (postnatal) circulation. In the absence of definitive clinical trials, information from applied physiological studies can be used to facilitate clinical decision making in the presence of hemodynamic compromise. This review summarizes the peculiar physiological features of the circulation as it transitions from one phenotype into another in term and preterm infants. The common causes of hemodynamic compromise during transition, intact umbilical cord resuscitation, and advanced hemodynamic monitoring are discussed. IMPACT: Transitional circulation can vary markedly between infants. There are alterations in preload, contractility, and afterload during the transition of circulation after birth in term and preterm infants. Hemodynamic monitoring tools and technology during neonatal transition and utilization of bedside echocardiography during the neonatal transition are increasingly recognized. Understanding the cardiovascular physiology of transition can help clinicians in making better decisions while managing infants with hemodynamic compromise. The objective assessment of cardio-respiratory transition and understanding of physiology in normal and disease states have the potential of improving short- and long-term health outcomes.
Collapse
Affiliation(s)
| | - Charles C Roehr
- National Perinatal Epidemiology Unit, Nuffield Department of Population Health, Medical Sciences Division, University of Oxford, Oxford, UK
- Newborn Services, Southmead Hospital, North Bristol Trust, Bristol, UK
- Faculty of Health Sciences, University of Bristol, Bristol, UK
| | - Stuart B Hooper
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
- The Ritchie Centre, Hudson Institute for Medical Research, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Neonatology, Willem Alexander Children's Hospital, Leiden University Medical Center Leiden, Leiden, The Netherlands
| | - Samir Gupta
- Division of Neonatology, Sidra Medicine, Doha, Qatar.
- Durham University, Durham, UK.
| |
Collapse
|
21
|
Blank DA, Crossley KJ, Thiel A, Rodgers KA, Zahra V, Kluckow M, Gill AW, Polglase GR, Hooper SB. Lung aeration reduces blood pressure surges caused by umbilical cord milking in preterm lambs. Front Pediatr 2023; 11:1073904. [PMID: 37025294 PMCID: PMC10071016 DOI: 10.3389/fped.2023.1073904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 02/17/2023] [Indexed: 04/08/2023] Open
Abstract
Background Umbilical cord milking (UCM) at birth causes surges in arterial blood pressure and blood flow to the brain, which may explain the high risk of intraventricular haemorrhage (IVH) in extremely preterm infants receiving UCM. This high risk of IVH has not been reported in older infants. Objective We hypothesized that lung aeration before UCM, reduces the surge in blood pressure and blood flow induced by UCM. Methods At 126 days' gestation, fetal lambs (N = 8) were exteriorised, intubated and instrumented to measure umbilical, pulmonary, cerebral blood flows, and arterial pressures. Prior to ventilation onset, the umbilical cord was briefly (2-3 s) occluded (8 times), which was followed by 8 consecutive UCMs when all physiological parameters had returned to baseline. Lambs were then ventilated. After diastolic pulmonary blood flow markedly increased in response to ventilation, the lambs received a further 8 consecutive UCMs. Ovine umbilical cord is shorter than the human umbilical cord, with ∼10 cm available for UCMs. Therefore, 8 UCMs/occlusions were done to match the volume reported in the human studies. Umbilical cord clamping occurred after the final milk. Results Both umbilical cord occlusions and UCM caused significant increases in carotid arterial blood flow and pressure. However, the increases in systolic and mean arterial blood pressure (10 ± 3 mmHg vs. 3 ± 2 mmHg, p = 0.01 and 10 ± 4 mmHg vs. 6 ± 2 mmHg, p = 0.048, respectively) and carotid artery blood flow (17 ± 6 ml/min vs. 10 ± 6 ml/min, p = 0.02) were significantly greater when UCM occurred before ventilation onset compared with UCM after ventilation. Conclusions UCM after ventilation onset significantly reduces the increases in carotid blood flow and blood pressure caused by UCM.
Collapse
Affiliation(s)
- Douglas A. Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Monash Newborn, Monash Children's Hospital, Melbourne, VIC, Australia
- The Department of Paediatrics, Monash University, Melbourne, VIC, Australia
- Correspondence: Douglas A. Blank
| | - Kelly J. Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- The Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Alison Thiel
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Karyn A. Rodgers
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Valerie Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Martin Kluckow
- Department of Neonatology, Royal North Shore Hospital and University of Sydney, Sydney NSW, Australia
| | - Andrew W. Gill
- Centre for Neonatal Research and Education, University of Western Australia, Perth, WA, Australia
| | - Graeme R. Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- The Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Stuart B. Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- The Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| |
Collapse
|
22
|
Panneflek TJR, Kuypers KLAM, Polglase GR, Hooper SB, van den Akker T, Te Pas AB. Effect of clinical chorioamnionitis on breathing effort in premature infants at birth: a retrospective case-control study. Arch Dis Child Fetal Neonatal Ed 2022; 108:280-285. [PMID: 36418158 DOI: 10.1136/archdischild-2022-324695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 11/15/2022] [Indexed: 11/24/2022]
Abstract
RATIONALE Antenatal inflammation, usually associated with chorioamnionitis, is a major cause of premature birth. As inflammation could depress respiratory drive, we have examined the effect of clinical chorioamnionitis (CCA) on spontaneous breathing in premature infants at birth. METHODS Infants with CCA born <30 weeks' gestation were matched with control infants based on gestational age (±6 days), birth weight (±300 g), antenatal corticosteroids, sex and general anaesthesia. The primary outcome was breathing effort, assessed as minute volume (MV) of spontaneous breathing. We also measured tidal volume (Vt), respiratory rate (RR) and apnoea in the first 5 min and additional physiological parameters in the first 10 min after start of respiratory support. RESULTS Ninety-two infants were included (n=46 CCA infants vs n=46 controls; median (IQR) gestational age 26+4 (25+0-27+6) vs 26+6 (25+1-28+3) weeks). MV and Vt were significantly lower (MV: 43 (17-93) vs 70 (31-119) mL/kg/min, p=0.043; Vt: 2.6 (1.9-3.6) vs 2.9 (2.2-4.8) mL/kg/breath, p=0.046), whereas RR was similar in CCA infants compared with controls. Incidence of apnoea was higher (5 (2-6) vs 2 (1-4), p=0.002), and total duration of apnoea was longer (90 (21-139) vs 35 (12-98) s, p=0.025) in CCA infants. CCA infants took significantly longer to reach an oxygen saturation >80% (3:37 (2:10-4:29) vs 2:25 (1:06-3:52) min, p=0.016) and had a lower oxygen saturation at 5 min (77 (66-92) vs 91 (68-94) %, p=0.028), despite receiving more oxygen (62 (48-76) vs 54 (43-73) %, p=0.036). CONCLUSION CCA is associated with reduced breathing effort and oxygenation in premature infants at birth.
Collapse
Affiliation(s)
- Timothy J R Panneflek
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, the Netherlands
| | - Kristel L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, the Netherlands
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Thomas van den Akker
- Department of Obstetrics, Leids Universitair Medisch Centrum, Leiden, the Netherlands.,Athena Institute, VU University, Amsterdam, the Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, the Netherlands
| |
Collapse
|
23
|
Knol R, Brouwer E, van den Akker T, DeKoninck PLJ, Lopriore E, Onland W, Vermeulen MJ, van den Akker-van Marle ME, van Bodegom-Vos L, de Boode WP, van Kaam AH, Reiss IKM, Polglase GR, Hutten GJ, Prins SA, Mulder EEM, Hulzebos CV, van Sambeeck SJ, van der Putten ME, Zonnenberg IA, Hooper SB, Te Pas AB. Physiological-based cord clamping in very preterm infants: the Aeration, Breathing, Clamping 3 (ABC3) trial-study protocol for a multicentre randomised controlled trial. Trials 2022; 23:838. [PMID: 36183143 PMCID: PMC9526936 DOI: 10.1186/s13063-022-06789-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 09/26/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND International guidelines recommend delayed umbilical cord clamping (DCC) up to 1 min in preterm infants, unless the condition of the infant requires immediate resuscitation. However, clamping the cord prior to lung aeration may severely limit circulatory adaptation resulting in a reduction in cardiac output and hypoxia. Delaying cord clamping until lung aeration and ventilation have been established (physiological-based cord clamping, PBCC) allows for an adequately established pulmonary circulation and results in a more stable circulatory transition. The decline in cardiac output following time-based delayed cord clamping (TBCC) may thus be avoided. We hypothesise that PBCC, compared to TBCC, results in a more stable transition in very preterm infants, leading to improved clinical outcomes. The primary objective is to compare the effect of PBCC on intact survival with TBCC. METHODS The Aeriation, Breathing, Clamping 3 (ABC3) trial is a multicentre randomised controlled clinical trial. In the interventional PBCC group, the umbilical cord is clamped after the infant is stabilised, defined as reaching heart rate > 100 bpm and SpO2 > 85% while using supplemental oxygen < 40%. In the control TBCC group, cord clamping is time based at 30-60 s. The primary outcome is survival without major cerebral and/or intestinal injury. Preterm infants born before 30 weeks of gestation are included after prenatal parental informed consent. The required sample size is 660 infants. DISCUSSION The findings of this trial will provide evidence for future clinical guidelines on optimal cord clamping management in very preterm infants at birth. TRIAL REGISTRATION ClinicalTrials.gov NCT03808051. First registered on January 17, 2019.
Collapse
Affiliation(s)
- Ronny Knol
- Division of Neonatology, Department of Paediatrics, Sophia Children's Hospital, Erasmus MC University Medical Center, P.O. Box 2060, 3000 CB, Rotterdam, The Netherlands. .,Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, The Netherlands.
| | - Emma Brouwer
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Thomas van den Akker
- Department of Obstetrics, Leiden University Medical Center, Leiden, The Netherlands.,Athena Institute, VU University, Amsterdam, The Netherlands
| | - Philip L J DeKoninck
- Department of Obstetrics and Gynaecology, Erasmus MC University Medical Center, Rotterdam, The Netherlands.,The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, VIC, Australia
| | - Enrico Lopriore
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Wes Onland
- Department of Neonatology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Marijn J Vermeulen
- Division of Neonatology, Department of Paediatrics, Sophia Children's Hospital, Erasmus MC University Medical Center, P.O. Box 2060, 3000 CB, Rotterdam, The Netherlands
| | | | - Leti van Bodegom-Vos
- Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands
| | - Willem P de Boode
- Division of Neonatology, Department of Paediatrics, Radboud University Medical Center, Radboud Institute for Health Sciences, Amalia Children's Hospital, Nijmegen, The Netherlands
| | - Anton H van Kaam
- Department of Neonatology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Irwin K M Reiss
- Division of Neonatology, Department of Paediatrics, Sophia Children's Hospital, Erasmus MC University Medical Center, P.O. Box 2060, 3000 CB, Rotterdam, The Netherlands
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, VIC, Australia
| | - G Jeroen Hutten
- Department of Neonatology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Sandra A Prins
- Department of Neonatology, Emma Children's Hospital, Amsterdam UMC, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Estelle E M Mulder
- Department of Neonatology, Isala Women and Children's Hospital, Zwolle, The Netherlands
| | - Christian V Hulzebos
- Department of Paediatrics, Beatrix Children's Hospital, University Medical Center Groningen, Groningen, The Netherlands
| | - Sam J van Sambeeck
- Department of Paediatrics, Maxima Medical Center, Veldhoven, The Netherlands
| | - Mayke E van der Putten
- Department of Paediatrics, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Inge A Zonnenberg
- Department of Neonatology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, VIC, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, The Netherlands
| |
Collapse
|
24
|
O'Connell DW, Morgan KS, Ruben G, Croton LCP, Pollock JA, Croughan MK, McGillick EV, Wallace MJ, Crossley KJ, Pryor EJ, Lewis RA, Hooper SB, Kitchen MJ. Accurate measures of changes in regional lung air volumes from chest x-rays of small animals. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac934d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 09/20/2022] [Indexed: 11/11/2022]
Abstract
Abstract
Objective. To develop a robust technique for calculating regional volume changes within the lung from X-ray radiograph sequences captured during ventilation, without the use of computed tomography (CT). Approach. This technique is based on the change in transmitted X-ray intensity that occurs for each lung region as air displaces the attenuating lung tissue. Main results. Lung air volumes calculated from X-ray intensity changes showed a strong correlation (R
2=0.98) against the true volumes, measured from high-resolution CT. This correlation enables us to accurately convert projected intensity data into relative changes in lung air volume. We have applied this technique to measure changes in regional lung volumes from X-ray image sequences of mechanically ventilated, recently-deceased newborn rabbits, without the use of CT. Significance. This method is suitable for biomedical research studies and shows potential for clinical application, whilst also allowing for high temporal and regional calculation of lung air volumes.
Collapse
|
25
|
Gaertner VD, Rüegger CM, Bassler D, O'Currain E, Kamlin COF, Hooper SB, Davis PG, Springer L. Effects of tactile stimulation on spontaneous breathing during face mask ventilation. Arch Dis Child Fetal Neonatal Ed 2022; 107:508-512. [PMID: 34862191 DOI: 10.1136/archdischild-2021-322989] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 11/16/2021] [Indexed: 02/06/2023]
Abstract
OBJECTIVE We sought to determine the effect of stimulation during positive pressure ventilation (PPV) on the number of spontaneous breaths, exhaled tidal volume (VTe), mask leak and obstruction. DESIGN Secondary analysis of a prospective, randomised trial comparing two face masks. SETTING Single-centre delivery room study. PATIENTS Newborn infants ≥34 weeks' gestation at birth. METHODS Resuscitations were video recorded. Tactile stimulations during PPV were noted and the timing, duration and surface area of applied stimulus were recorded. Respiratory flow waveforms were evaluated to determine the number of spontaneous breaths, VTe, leak and obstruction. Variables were recorded throughout each tactile stimulation episode and compared with those recorded in the same time period immediately before stimulation. RESULTS Twenty of 40 infants received tactile stimulation during PPV and we recorded 57 stimulations during PPV. During stimulation, the number of spontaneous breaths increased (median difference (IQR): 1 breath (0-3); padj<0.001) and VTe increased (0.5 mL/kg (-0.5 to 1.7), padj=0.028), whereas mask leak (0% (-20 to 1), padj=0.12) and percentage of obstructed inflations (0% (0-0), padj=0.14) did not change, compared with the period immediately prior to stimulation. Increased duration of stimulation (padj<0.001) and surface area of applied stimulus (padj=0.026) were associated with a larger increase in spontaneous breaths in response to tactile stimulation. CONCLUSIONS Tactile stimulation during PPV was associated with an increase in the number of spontaneous breaths compared with immediately before stimulation without a change in mask leak and obstruction. These data inform the discussion on continuing stimulation during PPV in term infants. TRIAL REGISTRATION NUMBER Australian and New Zealand Clinical Trial Registry (ACTRN12616000768493).
Collapse
Affiliation(s)
- Vincent D Gaertner
- Newborn Research, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Christoph Martin Rüegger
- Newborn Research, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Dirk Bassler
- Newborn Research, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Eoin O'Currain
- School of Medicine, University College Dublin and National Maternity Hospital Dublin, Dublin, Ireland
| | - C Omar Farouk Kamlin
- Newborn Research Centre and Neonatal Services, The Royal Women's Hospital, Melbourne, Victoria, Australia.,The University of Melbourne, Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Melbourne, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre and Neonatal Services, The Royal Women's Hospital, Melbourne, Victoria, Australia.,The University of Melbourne, Melbourne, Victoria, Australia.,Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Laila Springer
- Department of Neonatology, University Clinic Tubingen, Tubingen, Germany
| |
Collapse
|
26
|
Schmölzer GM, Roberts CT, Blank DA, Badurdeen S, Miller SL, Crossley KJ, Stojanovska V, Galinsky R, Kluckow M, Gill AW, Hooper SB, Polglase GR. Single versus continuous sustained inflations during chest compressions and physiological-based cord clamping in asystolic lambs. Arch Dis Child Fetal Neonatal Ed 2022; 107:488-494. [PMID: 34844983 PMCID: PMC9411918 DOI: 10.1136/archdischild-2021-322881] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 11/03/2021] [Indexed: 11/23/2022]
Abstract
BACKGROUND The feasibility and benefits of continuous sustained inflations (SIs) during chest compressions (CCs) during delayed cord clamping (physiological-based cord clamping; PBCC) are not known. We aimed to determine whether continuous SIs during CCs would reduce the time to return of spontaneous circulation (ROSC) and improve post-asphyxial blood pressures and flows in asystolic newborn lambs. METHODS Fetal sheep were surgically instrumented immediately prior to delivery at ~139 days' gestation and asphyxia induced until lambs reached asystole. Lambs were randomised to either immediate cord clamping (ICC) or PBCC. Lambs then received a single SI (SIsing; 30 s at 30 cmH2O) followed by intermittent positive pressure ventilation, or continuous SIs (SIcont: 30 s duration with 1 s break). We thus examined 4 groups: ICC +SIsing, ICC +SIcont, PBCC +SIsing, and PBCC +SIcont. Chest compressions and epinephrine administration followed international guidelines. PBCC lambs underwent cord clamping 10 min after ROSC. Physiological and oxygenation variables were measured throughout. RESULTS The time taken to achieve ROSC was not different between groups (mean (SD) 4.3±2.9 min). Mean and diastolic blood pressure was higher during chest compressions in PBCC lambs compared with ICC lambs, but no effect of SIs was observed. SIcont significantly reduced pulmonary blood flow, diastolic blood pressure and oxygenation after ROSC compared with SIsing. CONCLUSION We found no significant benefit of SIcont over SIsing during CPR on the time to ROSC or on post-ROSC haemodynamics, but did demonstrate the feasibility of continuous SIs during advanced CPR on an intact umbilical cord. Longer-term studies are recommended before this technique is used routinely in clinical practice.
Collapse
Affiliation(s)
| | - Calum T Roberts
- Department of Paediatrics, Monash University Faculty of Medicine Nursing and Health Sciences, Clayton, Victoria, Australia
| | - Douglas A Blank
- Monash Newborn, Monash Health, Clayton, Victoria, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Shiraz Badurdeen
- Newborn Research Centre, Royal Women's Hospital, Parkville, Victoria, Australia
| | - Suzanne L Miller
- The Ritchie Centre, Monash University, Clayton, Victoria, Australia
| | - Kelly J Crossley
- Hudson Institute of Medical Research, Ritchie Centre, Monash University, Melbourne, Victoria, Australia
| | | | - Robert Galinsky
- The Ritchie Centre, Monash University, Clayton, Victoria, Australia
| | - Martin Kluckow
- Department of Neonatology, St Leonards, New South Wales, Australia
| | - Andrew W Gill
- Centre for Neonatal Research and Education, University of Western Australia, Perth, Western Australia, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
- Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Graeme R Polglase
- Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
- Hudson Institute of Medical Research, Clayton, Victoria, Australia
| |
Collapse
|
27
|
Hooper SB, Te Pas AB, Blank DA, Polglase GR. The physiology of delayed umbilical cord clamping at birth: let's not add to the confusion. J Physiol 2022; 600:3625-3626. [PMID: 35819854 DOI: 10.1113/jp283359] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Stuart B Hooper
- The Ritchie Centre, The Hudson, Institute for Medical Research, Melbourne, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Douglas A Blank
- The Ritchie Centre, The Hudson, Institute for Medical Research, Melbourne, Australia.,The Department of Paediatrics, Monash University, Melbourne, Australia
| | - Graeme R Polglase
- The Ritchie Centre, The Hudson, Institute for Medical Research, Melbourne, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| |
Collapse
|
28
|
Badurdeen S, Davis PG, Hooper SB, Donath S, Santomartino GA, Heng A, Zannino D, Hoq M, Omar F Kamlin C, Kane SC, Woodward A, Roberts CT, Polglase GR, Blank DA. Physiologically based cord clamping for infants ≥32+0 weeks gestation: A randomised clinical trial and reference percentiles for heart rate and oxygen saturation for infants ≥35+0 weeks gestation. PLoS Med 2022; 19:e1004029. [PMID: 35737735 PMCID: PMC9269938 DOI: 10.1371/journal.pmed.1004029] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 07/08/2022] [Accepted: 05/25/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Globally, the majority of newborns requiring resuscitation at birth are full term or late-preterm infants. These infants typically have their umbilical cord clamped early (ECC) before moving to a resuscitation platform, losing the potential support of the placental circulation. Physiologically based cord clamping (PBCC) is clamping the umbilical cord after establishing lung aeration and holds promise as a readily available means of improving early newborn outcomes. In mechanically ventilated lambs, PBCC improved cardiovascular stability and reduced hypoxia. We hypothesised that PBCC compared to ECC would result in higher heart rate (HR) in infants needing resuscitation, without compromising safety. METHODS AND FINDINGS Between 4 July 2018 and 18 May 2021, infants born at ≥32+0 weeks' gestation with a paediatrician called to attend were enrolled in a parallel-arm randomised trial at 2 Australian perinatal centres. Following initial stimulation, infants requiring further resuscitation were randomised within 60 seconds of birth using a smartphone-accessible web link. The intervention (PBCC) was to establish lung aeration, either via positive pressure ventilation (PPV) or effective spontaneous breathing, prior to cord clamping. The comparator was early cord clamping (ECC) prior to resuscitation. The primary outcome was mean HR between 60 to 120 seconds after birth, measured using 3-lead electrocardiogram, extracted from video recordings blinded to group allocation. Nonrandomised infants had deferred cord clamping (DCC) ≥120 seconds in the observational study arm. Among 508 at-risk infants enrolled, 123 were randomised (n = 63 to PBCC, n = 60 to ECC). Median (interquartile range, IQR) for gestational age was 39.9 (38.3 to 40.7) weeks in PBCC infants and 39.6 (38.4 to 40.4) weeks in ECC infants. Approximately 49% and 50% of the PBCC and ECC infants were female, respectively. Five infants (PBCC = 2, ECC = 3, 4% total) had missing primary outcome data. Cord clamping occurred at a median (IQR) of 136 (126 to 150) seconds in the PBCC arm and 37 (27 to 51) seconds in the ECC arm. Mean HR between 60 to 120 seconds after birth was 154 bpm (beats per minute) for PBCC versus 158 bpm for ECC (adjusted mean difference -6 bpm, 95% confidence interval (CI) -17 to 5 bpm, P = 0.39). Among 31 secondary outcomes, postpartum haemorrhage ≥500 ml occurred in 34% and 32% of mothers in the PBCC and ECC arms, respectively. Two hundred ninety-five nonrandomised infants (55% female) with median (IQR) gestational age of 39.6 (38.6 to 40.6) weeks received DCC. Data from these infants was used to create percentile charts of expected HR and oxygen saturation in vigorous infants receiving DCC. The trial was limited by the small number of infants requiring prolonged or advanced resuscitation. PBCC may provide other important benefits we did not measure, including improved maternal-infant bonding and higher iron stores. CONCLUSIONS In this study, we observed that PBCC resulted in similar mean HR compared to infants receiving ECC. The findings suggest that for infants ≥32+0 weeks' gestation who receive brief, effective resuscitation at closely monitored births, PBCC does not provide additional benefit over ECC (performed after initial drying and stimulation) in terms of key physiological markers of transition. PBCC was feasible using a simple, low-cost strategy at both cesarean and vaginal births. The percentile charts of HR and oxygen saturation may guide clinicians monitoring the transition of at-risk infants who receive DCC. TRIAL REGISTRATION Australian New Zealand Clinical Trials Registry (ANZCTR) ACTRN12618000621213.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Newborn Research Centre, The Royal Women’s Hospital, Melbourne, Australia
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- * E-mail:
| | - Peter G. Davis
- Newborn Research Centre, The Royal Women’s Hospital, Melbourne, Australia
- Clinical Epidemiology and Biostatistics Unit and Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
- The University of Melbourne, Department of Obstetrics and Gynaecology, Melbourne, Australia
| | - Stuart B. Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Departments of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Susan Donath
- Clinical Epidemiology and Biostatistics Unit and Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
| | | | - Alissa Heng
- Departments of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Diana Zannino
- Clinical Epidemiology and Biostatistics Unit and Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
| | - Monsurul Hoq
- Clinical Epidemiology and Biostatistics Unit and Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
| | - C. Omar F Kamlin
- Newborn Research Centre, The Royal Women’s Hospital, Melbourne, Australia
| | - Stefan C. Kane
- The University of Melbourne, Department of Obstetrics and Gynaecology, Melbourne, Australia
- Division of Maternity Services and Department of Maternal Fetal Medicine, The Royal Women’s Hospital, Melbourne, Australia
| | - Anthony Woodward
- Division of Maternity Services and Department of Maternal Fetal Medicine, The Royal Women’s Hospital, Melbourne, Australia
| | - Calum T. Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Paediatrics, Monash University, Melbourne, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, Australia
| | - Graeme R. Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Departments of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Douglas A. Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Paediatrics, Monash University, Melbourne, Australia
- Monash Newborn, Monash Children’s Hospital, Melbourne, Australia
| | | |
Collapse
|
29
|
Roberts CT, Klink S, Schmölzer GM, Blank DA, Badurdeen S, Crossley KJ, Rodgers K, Zahra V, Moxham A, Roehr CC, Kluckow M, Gill AW, Hooper SB, Polglase GR. Comparison of intraosseous and intravenous epinephrine administration during resuscitation of asphyxiated newborn lambs. Arch Dis Child Fetal Neonatal Ed 2022; 107:311-316. [PMID: 34462318 DOI: 10.1136/archdischild-2021-322638] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/12/2021] [Indexed: 11/03/2022]
Abstract
OBJECTIVE Intraosseous access is recommended as a reasonable alternative for vascular access during newborn resuscitation if umbilical access is unavailable, but there are minimal reported data in newborns. We compared intraosseous with intravenous epinephrine administration during resuscitation of severely asphyxiated lambs at birth. METHODS Near-term lambs (139 days' gestation) were instrumented antenatally for measurement of carotid and pulmonary blood flow and systemic blood pressure. Intrapartum asphyxia was induced by umbilical cord clamping until asystole. Resuscitation commenced with positive pressure ventilation followed by chest compressions and the lambs received either intraosseous or central intravenous epinephrine (10 μg/kg); epinephrine administration was repeated every 3 min until return of spontaneous circulation (ROSC). The lambs were maintained for 30 min after ROSC. Plasma epinephrine levels were measured before cord clamping, at end asphyxia, and at 3 and 15 min post-ROSC. RESULTS ROSC was successful in 7 of 9 intraosseous epinephrine lambs and in 10 of 12 intravenous epinephrine lambs. The time and number of epinephrine doses required to achieve ROSC were similar between the groups, as were the achieved plasma epinephrine levels. Lambs in both groups displayed a similar marked overshoot in systemic blood pressure and carotid blood flow after ROSC. Blood gas parameters improved more quickly in the intraosseous lambs in the first 3 min, but were otherwise similar over the 30 min after ROSC. CONCLUSIONS Intraosseous epinephrine administration results in similar outcomes to intravenous epinephrine during resuscitation of asphyxiated newborn lambs. These findings support the inclusion of intraosseous access as a route for epinephrine administration in current guidelines.
Collapse
Affiliation(s)
- Calum T Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia .,Department of Paediatrics, Monash University, Clayton, Victoria, Australia.,Monash Newborn, Monash Health, Clayton, Victoria, Australia
| | - Sarah Klink
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Georg M Schmölzer
- Centre for the Studies of Asphyxia and Resuscitation, University of Alberta, Royal Alexandra Hospital, Edmonton, Alberta, Canada
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Paediatrics, Monash University, Clayton, Victoria, Australia.,Monash Newborn, Monash Health, Clayton, Victoria, Australia
| | - Shiraz Badurdeen
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Newborn Research Centre, Royal Women's Hospital, Parkville, Victoria, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Karyn Rodgers
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Valerie Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Alison Moxham
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Charles Christoph Roehr
- National Perinatal Epidemiology Unit, Nuffield Department of Population Health, Medical Sciences Division, University of Oxford, Oxford, UK.,Newborn Care, Division of Women and Children, University of Bristol, Southmead Hospital, North Bristol NHS Trust, Bristol, UK.,Newborn Care, Southmead Hospital, North Bristol NHS Trust, Bristol, UK
| | - Martin Kluckow
- Department of Neonatology, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Andrew William Gill
- Centre for Neonatal Research and Education, University of Western Australia, Perth, Western Australia, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| |
Collapse
|
30
|
Van Calster B, Benachi A, Nicolaides KH, Gratacos E, Berg C, Persico N, Gardener GJ, Belfort M, Ville Y, Ryan G, Johnson A, Sago H, Kosiński P, Bagolan P, Van Mieghem T, DeKoninck PLJ, Russo FM, Hooper SB, Deprest JA. The randomized Tracheal Occlusion To Accelerate Lung growth (TOTAL)-trials on fetal surgery for congenital diaphragmatic hernia: reanalysis using pooled data. Am J Obstet Gynecol 2022; 226:560.e1-560.e24. [PMID: 34808130 DOI: 10.1016/j.ajog.2021.11.1351] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/15/2021] [Accepted: 11/15/2021] [Indexed: 11/15/2022]
Abstract
BACKGROUND Two randomized controlled trials compared the neonatal and infant outcomes after fetoscopic endoluminal tracheal occlusion with expectant prenatal management in fetuses with severe and moderate isolated congenital diaphragmatic hernia, respectively. Fetoscopic endoluminal tracheal occlusion was carried out at 27+0 to 29+6 weeks' gestation (referred to as "early") for severe and at 30+0 to 31+6 weeks ("late") for moderate hypoplasia. The reported absolute increase in the survival to discharge was 13% (95% confidence interval, -1 to 28; P=.059) and 25% (95% confidence interval, 6-46; P=.0091) for moderate and severe hypoplasia. OBJECTIVE Data from the 2 trials were pooled to study the heterogeneity of the treatment effect by observed over expected lung-to-head ratio and explore the effect of gestational age at balloon insertion. STUDY DESIGN Individual participant data from the 2 trials were reanalyzed. Women were assessed between 2008 and 2020 at 14 experienced fetoscopic endoluminal tracheal occlusion centers and were randomized in a 1:1 ratio to either expectant management or fetoscopic endoluminal tracheal occlusion. All received standardized postnatal management. The combined data involved 287 patients (196 with moderate hypoplasia and 91 with severe hypoplasia). The primary endpoint was survival to discharge from the neonatal intensive care unit. The secondary endpoints were survival to 6 months of age, survival to 6 months without oxygen supplementation, and gestational age at live birth. Penalized regression was used with the following covariates: intervention (fetoscopic endoluminal tracheal occlusion vs expectant), early balloon insertion (yes vs no), observed over expected lung-to-head ratio, liver herniation (yes vs no), and trial (severe vs moderate). The interaction between intervention and the observed over expected lung-to-head ratio was evaluated to study treatment effect heterogeneity. RESULTS For survival to discharge, the adjusted odds ratio of fetoscopic endoluminal tracheal occlusion was 1.78 (95% confidence interval, 1.05-3.01; P=.031). The additional effect of early balloon insertion was highly uncertain (adjusted odds ratio, 1.53; 95% confidence interval, 0.60-3.91; P=.370). When combining these 2 effects, the adjusted odds ratio of fetoscopic endoluminal tracheal occlusion with early balloon insertion was 2.73 (95% confidence interval, 1.15-6.49). The results for survival to 6 months and survival to 6 months without oxygen dependence were comparable. The gestational age at delivery was on average 1.7 weeks earlier (95% confidence interval, 1.1-2.3) following fetoscopic endoluminal tracheal occlusion with late insertion and 3.2 weeks earlier (95% confidence interval, 2.3-4.1) following fetoscopic endoluminal tracheal occlusion with early insertion compared with expectant management. There was no evidence that the effect of fetoscopic endoluminal tracheal occlusion depended on the observed over expected lung-to-head ratio for any of the endpoints. CONCLUSION This analysis suggests that fetoscopic endoluminal tracheal occlusion increases survival for both moderate and severe lung hypoplasia. The difference between the results for the Tracheal Occlusion To Accelerate Lung growth trials, when considered apart, may be because of the difference in the time point of balloon insertion. However, the effect of the time point of balloon insertion could not be robustly assessed because of a small sample size and the confounding effect of disease severity. Fetoscopic endoluminal tracheal occlusion with early balloon insertion in particular strongly increases the risk for preterm delivery.
Collapse
Affiliation(s)
- Ben Van Calster
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven, Leuven, Belgium; Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, The Netherlands; EPI-center, Department of Public Health and Primary Care, KU Leuven, Leuven, Belgium
| | - Alexandra Benachi
- Department of Obstetrics and Gynaecology of the Hospital Antoine Béclère, Université Paris Saclay, Clamart, France
| | | | | | | | - Nicola Persico
- Hospital Maggiore Policlinico IRCCS, University of Milan, Milan, Italy
| | | | - Michael Belfort
- Texas Children's Hospital, Baylor College of Medicine Houston, TX
| | | | - Greg Ryan
- Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | | | - Haruhiko Sago
- National Center for Child Health and Development, Tokyo, Japan
| | - Przemysław Kosiński
- First Department of Obstetrics and Gynecology, Medical University of Warsaw, Warsaw, Poland
| | - Pietro Bagolan
- Medical and Surgical Department of the Fetus-Newborn-Infant, Bambino Gesù Children's Hospital, Research Institute, Rome, Italy
| | - Tim Van Mieghem
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven, Leuven, Belgium; Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Philip L J DeKoninck
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven, Leuven, Belgium; Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Francesca M Russo
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven, Leuven, Belgium; Clinical Department of Obstetrics and Gynaecology, University Hospitals Leuven, Leuven, Belgium
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute for Medical Research, Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Jan A Deprest
- Department of Development and Regeneration, Cluster Woman and Child, KU Leuven, Leuven, Belgium; Clinical Department of Obstetrics and Gynaecology, University Hospitals Leuven, Leuven, Belgium; Institute for Women's Health, University College London Hospital, London, United Kingdom.
| |
Collapse
|
31
|
Horn-Oudshoorn EJJ, Knol R, Vermeulen MJ, Te Pas AB, Hooper SB, Cochius-den Otter SCM, Wijnen RMH, Crossley KJ, Rafat N, Schaible T, de Boode WP, Debeer A, Urlesberger B, Roberts CT, Kipfmueller F, Reiss IKM, DeKoninck PLJ. Physiological-based cord clamping versus immediate cord clamping for infants born with a congenital diaphragmatic hernia (PinC): study protocol for a multicentre, randomised controlled trial. BMJ Open 2022; 12:e054808. [PMID: 35304395 PMCID: PMC8935184 DOI: 10.1136/bmjopen-2021-054808] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
INTRODUCTION Pulmonary hypertension is a major determinant of postnatal survival in infants with a congenital diaphragmatic hernia (CDH). The current care during the perinatal stabilisation period in these infants might contribute to the development of pulmonary hypertension after birth-in particular umbilical cord clamping before lung aeration. An ovine model of diaphragmatic hernia demonstrated that cord clamping after lung aeration, called physiological-based cord clamping (PBCC), avoided the initial high pressures in the lung vasculature while maintaining adequate blood flow, thereby avoiding vascular remodelling and aggravation of pulmonary hypertension. We aim to investigate if the implementation of PBCC in the perinatal stabilisation period of infants born with a CDH could reduce the incidence of pulmonary hypertension in the first 24 hours after birth. METHODS AND ANALYSIS We will perform a multicentre, randomised controlled trial in infants with an isolated left-sided CDH, born at ≥35.0 weeks. Before birth, infants will be randomised to either PBCC or immediate cord clamping, stratified by treatment centre and severity of pulmonary hypoplasia on antenatal ultrasound. PBCC will be performed using a purpose-built resuscitation trolley. Cord clamping will be performed when the infant is considered respiratory stable, defined as a heart rate >100 bpm, preductal oxygen saturation >85%, while using a fraction of inspired oxygen of <0.5. The primary outcome is pulmonary hypertension diagnosed in the first 24 hours after birth, based on clinical and echocardiographic parameters. Secondary outcomes include neonatal as well as maternal outcomes. ETHICS AND DISSEMINATION Central ethical approval was obtained from the Medical Ethical Committee of the Erasmus MC, Rotterdam, The Netherlands (METC 2019-0414). Local ethical approval will be obtained by submitting the protocol to the regulatory bodies and local institutional review boards. TRIAL REGISTRATION NUMBER NCT04373902.
Collapse
Affiliation(s)
- Emily J J Horn-Oudshoorn
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Ronny Knol
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Marijn J Vermeulen
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victoria, Australia
| | - Suzan C M Cochius-den Otter
- Department of Paediatric Surgery and Intensive Care, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Rene M H Wijnen
- Department of Paediatric Surgery and Intensive Care, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victoria, Australia
| | - Neysan Rafat
- Department of Neonatology, University Medical Centre Mannheim, Mannheim, Germany
| | - Thomas Schaible
- Department of Neonatology, University Medical Centre Mannheim, Mannheim, Germany
| | - Willem P de Boode
- Division of Neonatology, Department of Paediatrics, Radboudumc University Medical Center, Nijmegen, The Netherlands
| | - Anne Debeer
- Department of Neonatology, University Hospitals Leuven, Leuven, Belgium
| | - Berndt Urlesberger
- Division of Neonatology, Department of Paediatrics and Adolescent Medicine, Medical University of Graz, Graz, Austria
| | - Calum T Roberts
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victoria, Australia
- Department of Paediatrics, Monash University, Melbourne, Victoria, Australia
| | - Florian Kipfmueller
- Department of Neonatology and Paediatric Intensive Care Medicine, University of Bonn Children's Hospital, Bonn, Germany
| | - Irwin K M Reiss
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Philip L J DeKoninck
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, Victoria, Australia
- Division of Obstetrics and Fetal Medicine, Department of Obstetrics and Gynaecology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| |
Collapse
|
32
|
Yamaoka S, Crossley KJ, McDougall AR, Rodgers K, Zahra VA, Moxham A, Te Pas AB, McGillick EV, Hooper SB. Increased airway liquid volumes at birth impairs cardiorespiratory function in preterm and near-term lambs. J Appl Physiol (1985) 2022; 132:1080-1090. [PMID: 35271407 DOI: 10.1152/japplphysiol.00640.2021] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Respiratory distress is relatively common in infants born at or near-term, particularly in infants delivered following elective cesarean section. The pathophysiology underlying respiratory distress at term has largely been explained by a failure to clear airway liquid, but recent physiological evidence has indicated that it results from elevated airway liquid at the onset of air-breathing. We have investigated the effect of elevated airway liquid volumes at birth on cardiorespiratory function in preterm and near-term lambs. Preterm (130 ± 0 days gestation, term ~147 days gestation; n=13) and near-term (139 ± 1 days gestation; n=13) lambs were instrumented (to measure blood pressure, blood flow and blood gas status) and at delivery airway liquid volumes were adjusted to mimic levels expected following vaginal delivery (Controls; ~7mL/kg) or elective caesarean section with no labour (elevated liquid; EL; 37mL/kg). Lambs were delivered, mechanically ventilated and monitored for blood gas status, oxygenation, ventilator requirements, blood flows (carotid artery and pulmonary artery) and blood pressure during the first few hours of life. Preterm and near-term EL lambs had poorer gas exchange and required greater ventilatory support to maintain adequate oxygenation. Pulmonary blood flow was reduced and carotid artery blood flow, mean arterial blood pressure and heart rate were reduced in EL near-term but not preterm lambs. These data provide further evidence that greater airway liquid volumes at birth adversely effects newborn cardiorespiratory function, with the effects being greater in near-term newborns.
Collapse
Affiliation(s)
- Shigeo Yamaoka
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,Division of Neonatology, Department of Pediatrics, Osaka Medical and Pharmaceutical University, Takatsuki, Osaka, Japan
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Annie Ra McDougall
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Karyn Rodgers
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Valerie A Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Alison Moxham
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Erin Victoria McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| |
Collapse
|
33
|
Stojanovska V, Atta J, Kelly SB, Zahra VA, Matthews-Staindl E, Nitsos I, Moxham A, Pham Y, Hooper SB, Herlenius E, Galinsky R, Polglase GR. Increased Prostaglandin E2 in Brainstem Respiratory Centers Is Associated With Inhibition of Breathing Movements in Fetal Sheep Exposed to Progressive Systemic Inflammation. Front Physiol 2022; 13:841229. [PMID: 35309054 PMCID: PMC8928579 DOI: 10.3389/fphys.2022.841229] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/08/2022] [Indexed: 12/11/2022] Open
Abstract
Background Preterm newborns commonly experience apnoeas after birth and require respiratory stimulants and support. Antenatal inflammation is a common antecedent of preterm birth and inflammatory mediators, particularly prostaglandin E2 (PGE2), are associated with inhibition of vital brainstem respiratory centers. In this study, we tested the hypothesis that exposure to antenatal inflammation inhibits fetal breathing movements (FBMs) and increases inflammation and PGE2 levels in brainstem respiratory centers, cerebrospinal fluid (CSF) and blood plasma. Methods Chronically instrumented late preterm fetal sheep at 0.85 of gestation were randomly assigned to receive repeated intravenous saline (n = 8) or lipopolysaccharide (LPS) infusions (experimental day 1 = 300 ng, day 2 = 600 ng, day 3 = 1200 ng, n = 8). Fetal breathing movements were recorded throughout the experimental period. Sheep were euthanized 4 days after starting infusions for assessment of brainstem respiratory center histology. Results LPS infusions increased circulating and cerebrospinal fluid PGE2 levels, decreased arterial oxygen saturation, increased the partial pressure of carbon dioxide and lactate concentration, and decreased pH (p < 0.05 for all) compared to controls. LPS infusions caused transient reductions in the % of time fetuses spent breathing and the proportion of vigorous fetal breathing movements (P < 0.05 vs. control). LPS-exposure increased PGE2 expression in the RTN/pFRG (P < 0.05 vs. control) but not the pBÖTC (P < 0.07 vs. control) of the brainstem. No significant changes in gene expression were observed for PGE2 enzymes or caspase 3. LPS-exposure reduced the numbers of GFAP-immunoreactive astrocytes in the RTN/pFRG, NTS and XII of the brainstem (P < 0.05 vs. control for all) and increased microglial activation in the RTN/pFRG, preBÖTC, NTS, and XII brainstem respiratory centers (P < 0.05 vs. control for all). Conclusion Chronic LPS-exposure in late preterm fetal sheep increased PGE2 levels within the brainstem, CSF and plasma, and was associated with inhibition of FBMs, astrocyte loss and microglial activation within the brainstem respiratory centers. Further studies are needed to determine whether the inflammation-induced increase in PGE2 levels plays a key role in depressing respiratory drive in the perinatal period.
Collapse
Affiliation(s)
- Vanesa Stojanovska
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - John Atta
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Sharmony B. Kelly
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Valerie A. Zahra
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Eva Matthews-Staindl
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Ilias Nitsos
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Alison Moxham
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Yen Pham
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
| | - Stuart B. Hooper
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Eric Herlenius
- Department of Women’s and Children’s Health, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
- Astrid Lindgren Childrens Hospital, Karolinska University Hospital, Stockholm, Sweden
| | - Robert Galinsky
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
- *Correspondence: Robert Galinsky,
| | - Graeme R. Polglase
- The Ritchie Center, Hudson Institute of Medical Research, Melbourne, VIC, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
- Graeme R. Polglase,
| |
Collapse
|
34
|
Joyeux L, Basurto D, Bleeser T, Van der Veeken L, Vergote S, Kunpalin Y, Trigo L, Corno E, De Bie FR, De Coppi P, Ourselin S, Van Calenbergh F, Hooper SB, Rex S, Deprest J. Fetoscopic insufflation of heated-humidified carbon dioxide during simulated spina bifida repair is safe under controlled anesthesia in the fetal lamb. Prenat Diagn 2022; 42:180-191. [PMID: 35032031 DOI: 10.1002/pd.6093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 12/22/2021] [Accepted: 01/08/2022] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To assess the safety of Partial-Amniotic-Insufflation-of-heated-humidified-CO2 (hPACI) during fetoscopic spina bifida repair (fSB-repair). METHOD A simulated fSB-repair through an exteriorized uterus under hPACI was performed in 100-day fetal lambs (term = 145 days) under a laboratory anesthesia protocol (n = 5; group 1) which is known to induce maternal-fetal acidosis and hypercapnia. Since these may not occur clinically, we applied a clinical anesthesia protocol (n = 5; group 2), keeping maternal parameters within physiological conditions, that is, controlled maternal arterial carbon dioxide (CO2) pressure (pCO2 = 30 mmHg), blood pressure (≥67 mmHg), and temperature (37.1-39.8°C). Our superiority study used fetal pH as the primary outcome. RESULTS Compared to group 1, controlled anesthesia normalized fetal pH (7.23 ± 0.02 vs. 7.36 ± 0.02, p < 0.001), pCO2 (70.0 ± 9.1 vs. 43.0 ± 1.0 mmHg, p = 0.011) and bicarbonate (27.8 ± 1.1 vs. 24.0 ± 0.9 mmol/L, p = 0.071) at baseline. It kept them within clinically acceptable limits (pH ≥ 7.23, pCO2 ≤ 70 mmHg, bicarbonate ≤ 30 mm/L) for ≥120 min of hPACI as opposed to ≤30 min in group one. Fetal pO2 and lactate were comparable between groups and generally within normal range. Fetal brain histology demonstrated fewer apoptotic cells and higher neuronal density in the prefrontal cortex in group two. There was no difference in fetal membrane inflammation, which was mild. CONCLUSION Fetoscopic insufflation of heated-humidified CO2 during simulated fSB-repair through an exteriorized uterus can be done safely under controlled anesthesia.
Collapse
Affiliation(s)
- Luc Joyeux
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium
| | - David Basurto
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium
| | - Tom Bleeser
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Anesthesiology, University Hospitals Leuven, Leuven, Belgium
| | - Lennart Van der Veeken
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium
| | - Simen Vergote
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium
| | - Yada Kunpalin
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Institute of Women's Health, University College London Hospitals, London, UK
| | - Lucas Trigo
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,BCNatal, Fetal Medicine Research Center, Hospital Clinic and Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain.,Institut d'Investigacions Biomediques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Enrico Corno
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium
| | - Felix R De Bie
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Center for Fetal Diagnosis and Treatment, The Children's Hospital of Philadelphia, and the Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Paolo De Coppi
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium.,Specialist Neonatal and Pediatric Surgery Unit, Great Ormond Street Hospital, University College London Hospitals, NHS Trust, London, UK
| | - Sebastien Ourselin
- School of Biomedical Engineering & Imaging Sciences, King's College London, London, UK
| | | | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Steffen Rex
- Department of Anesthesiology, University Hospitals Leuven, Leuven, Belgium
| | - Jan Deprest
- My FetUZ Fetal Research Center, Department of Development and Regeneration, Biomedical Sciences, KU Leuven, Leuven, Belgium.,Center for Surgical Technologies, Faculty of Medicine, KU Leuven, Leuven, Belgium.,Department of Obstetrics & Gynecology, University Hospitals Leuven, Leuven, Belgium.,Institute of Women's Health, University College London Hospitals, London, UK
| |
Collapse
|
35
|
Pryor EJ, Blank DA, Hooper SB, Crossley KJ, Badurdeen S, Pollock JA, Stainsby AV, Croton LCP, O'Connell DW, Hall CJ, Maksimenko A, Hausermann D, Davis PG, Kitchen MJ. Quantifying lung aeration in neonatal lambs at birth using lung ultrasound. Front Pediatr 2022; 10:990923. [PMID: 36245717 PMCID: PMC9554403 DOI: 10.3389/fped.2022.990923] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/07/2022] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND Lung ultrasound (LUS) is a safe and non-invasive tool that can potentially assess regional lung aeration in newborn infants and reduce the need for X-ray imaging. LUS produces images with characteristic artifacts caused by the presence of air in the lung, but it is unknown if LUS can accurately detect changes in lung air volumes after birth. This study compared LUS images with lung volume measurements from high-resolution computed tomography (CT) scans to determine if LUS can accurately provide relative measures of lung aeration. METHODS Deceased near-term newborn lambs (139 days gestation, term ∼148 days) were intubated and the chest imaged using LUS (bilaterally) and phase contrast x-ray CT scans at increasing static airway pressures (0-50 cmH2O). CT scans were analyzed to calculate regional air volumes and correlated with measures from LUS images. These measures included (i) LUS grade; (ii) brightness (mean and coefficient of variation); and (iii) area under the Fourier power spectra within defined frequency ranges. RESULTS All LUS image analysis techniques correlated strongly with air volumes measured by CT (p < 0.01). When imaging statistics were combined in a multivariate linear regression model, LUS predicted the proportion of air in the underlying lung with moderate accuracy (95% prediction interval ± 22.15%, r 2 = 0.71). CONCLUSION LUS can provide relative measures of lung aeration after birth in neonatal lambs. Future studies are needed to determine if LUS can also provide a simple means to assess air volumes and individualize aeration strategies for critically ill newborns in real time.
Collapse
Affiliation(s)
- Emily J Pryor
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynecology, Monash University, Clayton, VIC, Australia
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Monash Newborn, Monash Children's Hospital, Clayton, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynecology, Monash University, Clayton, VIC, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynecology, Monash University, Clayton, VIC, Australia
| | - Shiraz Badurdeen
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Newborn Research Centre, The Royal Women's Hospital, Parkville, VIC, Australia
| | - James A Pollock
- School of Physics and Astronomy, Monash University, Clayton, VIC, Australia
| | - Andrew V Stainsby
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,Department of Obstetrics and Gynecology, Monash University, Clayton, VIC, Australia
| | - Linda C P Croton
- School of Physics and Astronomy, Monash University, Clayton, VIC, Australia
| | - Dylan W O'Connell
- School of Physics and Astronomy, Monash University, Clayton, VIC, Australia
| | | | | | | | - Peter G Davis
- Newborn Research Centre, The Royal Women's Hospital, Parkville, VIC, Australia
| | - Marcus J Kitchen
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC, Australia.,School of Physics and Astronomy, Monash University, Clayton, VIC, Australia
| |
Collapse
|
36
|
Brouwer E, Knol R, Kroushev A, Van Den Akker T, Hooper SB, Roest AA, te Pas AB. Effect of breathing on venous return during delayed cord clamping: an observational study. Arch Dis Child Fetal Neonatal Ed 2022; 107:65-69. [PMID: 34108193 PMCID: PMC8685611 DOI: 10.1136/archdischild-2020-321431] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 05/06/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVE To investigate the effect of spontaneous breathing on venous return in term infants during delayed cord clamping at birth. METHODS Echocardiographic ultrasound recordings were obtained directly after birth in healthy term-born infants. A subcostal view was used to obtain an optimal view of the inferior vena cava (IVC) entering the right atrium, including both the ductus venosus (DV) and the hepatic vein (HV). Colour Doppler was used to assess flow direction and flow velocity. Recordings continued until the umbilical cord was clamped and were stored in digital format for offline analyses. RESULTS Ultrasound recordings were obtained in 15 infants, with a median (IQR) gestational age of 39.6 (39.0-40.9) weeks and a birth weight of 3560 (3195-4205) g. Flow was observed to be antegrade in the DV and HV in 98% and 82% of inspirations, respectively, with flow velocity increasing in 74% of inspirations. Retrograde flow in the DV was observed sporadically and only occurred during expiration. Collapse of the IVC occurred during 58% of inspirations and all occurred caudal to the DV inlet (100%). CONCLUSION Spontaneous breathing was associated with collapse of the IVC and increased antegrade DV and HV flow velocity during inspiration. Therefore, inspiration appears to preferentially direct blood flow from the DV into the right atrium. This indicates that inspiration could be a factor driving placental transfusion in infants.
Collapse
Affiliation(s)
- Emma Brouwer
- Neonatology, Leiden University Medical Center Willem Alexander Children's Hospital, Leiden, The Netherlands
| | - Ronny Knol
- Neonatology, Leiden University Medical Center Willem Alexander Children's Hospital, Leiden, The Netherlands,Neonatology, Erasmus MC, Rotterdam, The Netherlands
| | - Annie Kroushev
- Monash Women's, Monash Health, Clayton, Victoria, Australia
| | | | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia,Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
| | - Arno A Roest
- Pediatric Cardiology, Leiden University Medical Center Willem Alexander Children’s Hospital, Leiden, The Netherlands
| | - Arjan B te Pas
- Neonatology, Leiden University Medical Center Willem Alexander Children's Hospital, Leiden, The Netherlands
| |
Collapse
|
37
|
Horn-Oudshoorn EJJ, Knol R, Cochius-den Otter SCM, Te Pas AB, Hooper SB, Roberts CT, Rafat N, Schaible T, de Boode WP, van der Lee R, Debeer A, Kipfmueller F, Roehr CC, Reiss IKM, DeKoninck PLJ. Spontaneous breathing approach in mild congenital diaphragmatic hernia: A resuscitation algorithm. Front Pediatr 2022; 10:945090. [PMID: 35923783 PMCID: PMC9339647 DOI: 10.3389/fped.2022.945090] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Infants with a congenital diaphragmatic hernia (CDH) and expected mild pulmonary hypoplasia have an estimated survival rate of 90%. Current guidelines for delivery room management do not consider the individual patient's disease severity, but an individualized approach with spontaneous breathing instead of routine mechanical ventilation could be beneficial for the mildest cases. We developed a resuscitation algorithm for this individualized approach serving two purposes: improving the success rate by structuring the approach and providing a guideline for other centers. METHODS An initial algorithm was discussed with all local stakeholders. Afterwards, the resulting algorithm was refined using input from international experts. RESULTS Eligible CDH infants: left-sided defect, observed to expected lung-to-head ratio ≥50%, gestational age at birth ≥37.0 weeks, and no major associated structural or genetic abnormalities. To facilitate fetal-to-neonatal transition, we propose to start stabilization with non-invasive respiratory support and to adjust this individually. CONCLUSIONS Infants with mild CDH might benefit from an individualized approach for neonatal resuscitation. Herein, we present an algorithm that could serve as guidance for centers implementing this.
Collapse
Affiliation(s)
- Emily J J Horn-Oudshoorn
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Ronny Knol
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Suzan C M Cochius-den Otter
- Intensive Care and Department of Paediatric Surgery, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, VIC, Australia
| | - Calum T Roberts
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, VIC, Australia.,Department of Paediatrics, Monash University, Melbourne, VIC, Australia
| | - Neysan Rafat
- Department of Neonatology, University Medical Center Mannheim, Mannheim, Germany
| | - Thomas Schaible
- Department of Neonatology, University Medical Center Mannheim, Mannheim, Germany
| | - Willem P de Boode
- Division of Neonatology, Department of Paediatrics, Radboud Institute for Health Sciences, Radboudumc Amalia Children's Hospital, Nijmegen, Netherlands
| | - Robin van der Lee
- Division of Neonatology, Department of Paediatrics, Radboud Institute for Health Sciences, Radboudumc Amalia Children's Hospital, Nijmegen, Netherlands
| | - Anne Debeer
- Department of Neonatology, University Hospitals Leuven, Leuven, Belgium
| | - Florian Kipfmueller
- Department of Neonatology and Paediatric Critical Care Medicine, University of Bonn Children's Hospital, Bonn, Germany
| | - Charles C Roehr
- National Perinatal Epidemiology Unit, Medical Sciences Division, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom.,Newborn Services Southmead Hospital, North Bristol Trust, Bristol, United Kingdom.,Faculty of Health Sciences, University of Bristol, Bristol, United Kingdom
| | - Irwin K M Reiss
- Division of Neonatology, Department of Paediatrics, Erasmus MC University Medical Center, Rotterdam, Netherlands
| | - Philip L J DeKoninck
- The Ritchie Centre, Hudson Institute for Medical Research, Monash University, Melbourne, VIC, Australia.,Division of Obstetrics and Fetal Medicine, Department of Obstetrics and Gynaecology, Erasmus MC University Medical Center, Rotterdam, Netherlands
| |
Collapse
|
38
|
Badurdeen S, Hodgson KA, Santomartino GA, Stevens L, Donath S, Roberts CT, Manley BJ, Polglase GR, Hooper SB, Davis PG, Blank DA. Rapid centralised randomisation in emergency setting trials using a smartphone. Eur J Pediatr 2022; 181:3207-3210. [PMID: 35579708 PMCID: PMC9352638 DOI: 10.1007/s00431-022-04475-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/04/2022] [Accepted: 04/09/2022] [Indexed: 12/29/2022]
Abstract
Randomised trials in emergency settings must quickly confirm eligibility and allocate participants to an intervention group without delaying treatment. We report rapid randomisation during two neonatal resuscitation trials using the non-commercial REDCap platform accessed via smartphone. This simple, reliable method has wide applicability for trials in emergency settings. What is Known: • Randomised trials in emergency settings need to rapidly allocate participants to an intervention group. • This process should not delay treatment. What is New: • This non-commercial, smartphone-accessible application enabled rapid, accurate randomisation at the bedside. • This has broad applicability for emergency setting trials.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Newborn Research Centre, The Royal Women’s Hospital, 20 Flemington Rd, Parkville, VIC 3052 Australia ,The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC Australia
| | - Kate A. Hodgson
- Newborn Research Centre, The Royal Women’s Hospital, 20 Flemington Rd, Parkville, VIC 3052 Australia ,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, VIC Australia
| | - Georgia A. Santomartino
- Newborn Research Centre, The Royal Women’s Hospital, 20 Flemington Rd, Parkville, VIC 3052 Australia
| | - Luke Stevens
- Clinical Epidemiology and Biostatistics Unit, Murdoch Children’s Research Institute, Parkville, VIC Australia
| | - Susan Donath
- Clinical Epidemiology and Biostatistics Unit, Murdoch Children’s Research Institute, Parkville, VIC Australia
| | - Calum T. Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC Australia ,Department of Paediatrics, Monash University, Wellington Rd, Clayton, VIC Australia ,Monash Newborn, Monash Children’s Hospital, Clayton, VIC Australia
| | - Brett J. Manley
- Newborn Research Centre, The Royal Women’s Hospital, 20 Flemington Rd, Parkville, VIC 3052 Australia ,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, VIC Australia ,Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
| | - Graeme R. Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC Australia ,Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC Australia
| | - Stuart B. Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC Australia ,Department of Obstetrics and Gynaecology, Monash University, Wellington Rd, Clayton, VIC Australia
| | - Peter G. Davis
- Newborn Research Centre, The Royal Women’s Hospital, 20 Flemington Rd, Parkville, VIC 3052 Australia ,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, VIC Australia ,Clinical Sciences Research, Murdoch Children’s Research Institute, Melbourne, Australia
| | - Douglas A. Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, VIC Australia ,Monash Newborn, Monash Children’s Hospital, Clayton, VIC Australia
| |
Collapse
|
39
|
McGillick EV, Te Pas AB, van den Akker T, Keus JMH, Thio M, Hooper SB. Evaluating Clinical Outcomes and Physiological Perspectives in Studies Investigating Respiratory Support for Babies Born at Term With or at Risk of Transient Tachypnea: A Narrative Review. Front Pediatr 2022; 10:878536. [PMID: 35813383 PMCID: PMC9260080 DOI: 10.3389/fped.2022.878536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 05/09/2022] [Indexed: 12/02/2022] Open
Abstract
Respiratory distress in the first few hours of life is a growing disease burden in otherwise healthy babies born at term (>37 weeks gestation). Babies born by cesarean section without labor (i.e., elective cesarean section) are at greater risk of developing respiratory distress due to elevated airway liquid volumes at birth. These babies are commonly diagnosed with transient tachypnea of the newborn (TTN) and historically treatments have mostly focused on enhancing airway liquid clearance pharmacologically or restricting fluid intake with limited success. Alternatively, a number of clinical studies have investigated the potential benefits of respiratory support in newborns with or at risk of TTN, but there is considerable heterogeneity in study designs and outcome measures. A literature search identified eight clinical studies investigating use of respiratory support on outcomes related to TTN in babies born at term. Study demographics including gestational age, mode of birth, antenatal corticosteroid exposure, TTN diagnosis, timing of intervention (prophylactic/interventional), respiratory support (type/interface/device/pressure), and study outcomes were compared. This narrative review provides an overview of factors within and between studies assessing respiratory support for preventing and/or treating TTN. In addition, we discuss the physiological understanding of how respiratory support aids lung function in newborns with elevated airway liquid volumes at birth. However, many questions remain regarding the timing of onset, pressure delivered, device/interface used and duration, and weaning of support. Future studies are required to address these gaps in knowledge to provide evidenced based recommendations for management of newborns with or at risk of TTN.
Collapse
Affiliation(s)
- Erin V McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Thomas van den Akker
- Department of Obstetrics and Gynaecology, Leiden University Medical Center, Leiden, Netherlands.,Athena Institute, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - J M H Keus
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Marta Thio
- Newborn Research, The Royal Women's Hospital, Melbourne, VIC, Australia.,The Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Obstetrics and Gynaecology, University of Melbourne, Melbourne, VIC, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| |
Collapse
|
40
|
Kuypers KLAM, Willemsen LA, Cramer SJE, Kashyap AJ, Drevhammar T, Hooper SB, Te Pas AB. The Effect of a Higher Bias Gas Flow on Imposed T-Piece Resistance and Breathing in Preterm Infants at Birth. Front Pediatr 2022; 10:817010. [PMID: 35372143 PMCID: PMC8968754 DOI: 10.3389/fped.2022.817010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 02/21/2022] [Indexed: 11/14/2022] Open
Abstract
OBJECTIVE The resistance created by the PEEP-valve of a T-piece resuscitator is bias gas flow dependent and might affect breathing in preterm infants. In this study we investigated the effect of a higher bias gas flow on the imposed inspiratory and expiratory T-piece resistance and expiratory breaking manoeuvres (EBM) in preterm infants during spontaneous breathing on CPAP at birth. METHODS In a retrospective pre-post implementation study of preterm infants <32 weeks gestation, who were stabilised with a T-piece resuscitator, a bias gas flow of 12 L/min was compared to 8 L/min. All spontaneous breaths on CPAP within the first 10 min of starting respiratory support were analysed on a breath-by-breath basis to determine the breathing pattern of each breath and to calculate the imposed inspiratory and expiratory T-piece resistance (Ri, Re), flow rates and tidal volume. RESULTS In total, 54 infants were included (bias gas flow 12 L/min: n = 27, 8 L/min: n = 27) with a median GA of 29+6 (28+4-30+3) and 28+5 (25+6-30+3), respectively (p = 0.182). Ri and Re were significantly lower in the 12 L/min compared to 8 L/min bias flow group [Ri: 29.6 (26.1-33.6) vs. 46.4 (43.0-54.1) cm H2O/L/s, p < 0.001; Re: 32.0 (30.0-35.1) vs. 48.0 (46.3-53.9) cm H2O/L/s, p < 0.001], while the incidence of EBM [77% (53-88) vs. 77% (58-90), p = 0.586] was similar. CONCLUSION During stabilisation of preterm infants at birth with a T-piece resuscitator, the use of a higher bias gas flow reduced both the imposed inspiratory and expiratory T-piece resistance for the infant, but this did not influence the incidence of EBMs.
Collapse
Affiliation(s)
- Kristel L A M Kuypers
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - Lieve A Willemsen
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - Sophie J E Cramer
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| | - Aidan J Kashyap
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Thomas Drevhammar
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden.,Department of Anaesthesiology, Östersund Hospital, Östersund, Sweden
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, VIC, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, VIC, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Paediatrics, Willem-Alexander Children's Hospital, Leiden University Medical Centre, Leiden, Netherlands
| |
Collapse
|
41
|
Gaertner VD, Waldmann AD, Bassler D, Hooper SB, Rüegger CM. Intrapulmonary Volume Changes during Hiccups versus Spontaneous Breaths in a Preterm Infant. Neonatology 2022; 119:525-529. [PMID: 35398844 DOI: 10.1159/000524194] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 03/16/2022] [Indexed: 11/19/2022]
Abstract
Hiccups occur at all ages but are most common during fetal development, and accordingly, they are seen regularly in preterm infants. However, the physiologic correlate of hiccups has never been established. We present the case of a preterm infant who developed a spell of hiccups and compared lung volume changes during hiccups with spontaneous breaths using electrical impedance tomography. Hiccups mostly occurred during the expiratory phase of breathing and were associated with a shorter inspiratory time and a larger tidal volume compared with spontaneous breaths. The center of ventilation was shifted toward the ventral (non-gravity-dependent) part of the lung during hiccups and volume changes were mainly restricted to the larger airways, but some gas flow also reached the lung parenchyma. Our observations shed new light on this phenomenon, which is well known but little researched, and our findings may imply a physiological impact of hiccups during fetal development.
Collapse
Affiliation(s)
- Vincent D Gaertner
- Newborn Research Zurich, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Andreas D Waldmann
- Department of Anesthesiology and Intensive Care Medicine, Rostock University Medical Center, Rostock, Germany
| | - Dirk Bassler
- Newborn Research Zurich, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Melbourne, Victoria, Australia
| | - Christoph M Rüegger
- Newborn Research Zurich, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| |
Collapse
|
42
|
Liley HG, Hooper SB, Nakwa FL. Worldwide success of CPAP in the delivery room - Still a work in progress. Resuscitation 2021; 170:264-265. [PMID: 34826579 DOI: 10.1016/j.resuscitation.2021.11.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 11/16/2021] [Indexed: 11/30/2022]
Affiliation(s)
- Helen G Liley
- Faculty of Medicine and Mater Research, The University of Queensland, Australia.
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Firdose L Nakwa
- School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| |
Collapse
|
43
|
Badurdeen S, Santomartino GA, Thio M, Heng A, Woodward A, Polglase GR, Hooper SB, Blank DA, Davis PG. Respiratory support after delayed cord clamping: a prospective cohort study of at-risk births at ≥35 +0 weeks gestation. Arch Dis Child Fetal Neonatal Ed 2021; 106:627-634. [PMID: 34112723 PMCID: PMC8543210 DOI: 10.1136/archdischild-2020-321503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 03/30/2021] [Accepted: 04/12/2021] [Indexed: 01/14/2023]
Abstract
OBJECTIVE To identify risk factors associated with delivery room respiratory support in at-risk infants who are initially vigorous and received delayed cord clamping (DCC). DESIGN Prospective cohort study. SETTING Two perinatal centres in Melbourne, Australia. PATIENTS At-risk infants born at ≥35+0 weeks gestation with a paediatric doctor in attendance who were initially vigorous and received DCC for >60 s. MAIN OUTCOME MEASURES Delivery room respiratory support defined as facemask positive pressure ventilation, continuous positive airway pressure and/or supplemental oxygen within 10 min of birth. RESULTS Two hundred and ninety-eight infants born at a median (IQR) gestational age of 39+3 (38+2-40+2) weeks were included. Cord clamping occurred at a median (IQR) of 128 (123-145) s. Forty-four (15%) infants received respiratory support at a median of 214 (IQR 156-326) s after birth. Neonatal unit admission for respiratory distress occurred in 32% of infants receiving delivery room respiratory support vs 1% of infants who did not receive delivery room respiratory support (p<0.001). Risk factors independently associated with delivery room respiratory support were average heart rate (HR) at 90-120 s after birth (determined using three-lead ECG), mode of birth and time to establish regular cries. Decision tree analysis identified that infants at highest risk had an average HR of <165 beats per minute at 90-120 s after birth following caesarean section (risk of 39%). Infants with an average HR of ≥165 beats per minute at 90-120 s after birth were at low risk (5%). CONCLUSIONS We present a clinical decision pathway for at-risk infants who may benefit from close observation following DCC. Our findings provide a novel perspective of HR beyond the traditional threshold of 100 beats per minute.
Collapse
Affiliation(s)
- Shiraz Badurdeen
- Newborn Research Centre, Royal Women's Hospital, Parkville, Victoria, Australia .,The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | | | - Marta Thio
- Newborn Research Centre, Royal Women's Hospital, Parkville, Victoria, Australia
| | - Alissa Heng
- Monash University Faculty of Medicine, Nursing and Health Sciences, Clayton, Victoria, Australia
| | - Anthony Woodward
- Department of Obstetrics, Royal Women's Hospital Department of Obstetrics and Gynaecology, Melbourne, Victoria, Australia
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia,Obstetrics and Gynaecology, Monash University Faculty of Medicine, Nursing and Health Sciences, Clayton, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia,Obstetrics and Gynaecology, Monash University Faculty of Medicine, Nursing and Health Sciences, Clayton, Victoria, Australia
| | - Douglas A Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia,Monash Newborn, Monash Health, Clayton, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre, Royal Women's Hospital, Parkville, Victoria, Australia
| |
Collapse
|
44
|
Kelly SB, Stojanovska V, Zahra VA, Moxham A, Miller SL, Moss TJM, Hooper SB, Nold MF, Nold-Petry CA, Dean JM, Bennet L, Polglase GR, Gunn AJ, Galinsky R. Interleukin-1 blockade attenuates white matter inflammation and oligodendrocyte loss after progressive systemic lipopolysaccharide exposure in near-term fetal sheep. J Neuroinflammation 2021; 18:189. [PMID: 34465372 PMCID: PMC8408978 DOI: 10.1186/s12974-021-02238-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 08/11/2021] [Indexed: 12/14/2022] Open
Abstract
Background Increased systemic and tissue levels of interleukin (IL)-1β are associated with greater risk of impaired neurodevelopment after birth. In this study, we tested the hypothesis that systemic IL-1 receptor antagonist (Ra) administration would attenuate brain inflammation and injury in near-term fetal sheep exposed to lipopolysaccharide (LPS). Methods Chronically instrumented near-term fetal sheep at 0.85 of gestation were randomly assigned to saline infusion (control, n = 9), repeated LPS infusions (0 h = 300 ng, 24 h = 600 ng, 48 h = 1200 ng, n = 8) or repeated LPS plus IL-1Ra infusions (13 mg/kg infused over 4 h) started 1 h after each LPS infusion (n = 9). Sheep were euthanized 4 days after starting infusions for histology. Results LPS infusions increased circulating cytokines and were associated with electroencephalogram (EEG) suppression with transiently reduced mean arterial blood pressure, and increased carotid artery perfusion and fetal heart rate (P < 0.05 vs. control for all). In the periventricular and intragyral white matter, LPS-exposure increased IL-1β immunoreactivity, numbers of caspase 3+ cells and microglia, reduced astrocyte and olig-2+ oligodendrocyte survival but did not change numbers of mature CC1+ oligodendrocytes, myelin expression or numbers of neurons in the cortex and subcortical regions. IL-1Ra infusions reduced circulating cytokines and improved recovery of EEG activity and carotid artery perfusion. Histologically, IL-1Ra reduced microgliosis, IL-1β expression and caspase-3+ cells, and improved olig-2+ oligodendrocyte survival. Conclusion IL-1Ra improved EEG activity and markedly attenuated systemic inflammation, microgliosis and oligodendrocyte loss following LPS exposure in near-term fetal sheep. Further studies examining the long-term effects on brain maturation are now needed. Supplementary Information The online version contains supplementary material available at 10.1186/s12974-021-02238-4.
Collapse
Affiliation(s)
- Sharmony B Kelly
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Vanesa Stojanovska
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia
| | - Valerie A Zahra
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia
| | - Alison Moxham
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia
| | - Suzanne L Miller
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Timothy J M Moss
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Marcel F Nold
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Paediatrics, Monash University, Melbourne, Victoria, Australia.,Monash Newborn, Monash Children's Hospital, Melbourne, Australia
| | - Claudia A Nold-Petry
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Paediatrics, Monash University, Melbourne, Victoria, Australia
| | - Justin M Dean
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Laura Bennet
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Graeme R Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia.,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Alistair J Gunn
- Department of Physiology, The University of Auckland, Auckland, New Zealand
| | - Robert Galinsky
- The Ritchie Centre, Hudson Institute of Medical Research, 27-31 Wright street, Melbourne, Victoria, 3168, Australia. .,Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia.
| |
Collapse
|
45
|
Amberg BJ, Hodges RJ, Rodgers KA, Crossley KJ, Hooper SB, DeKoninck PLJ. Why Do the Fetal Membranes Rupture Early after Fetoscopy? A Review. Fetal Diagn Ther 2021; 48:493-503. [PMID: 34404043 DOI: 10.1159/000517151] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 05/03/2021] [Indexed: 11/19/2022]
Abstract
Iatrogenic preterm premature rupture of the fetal membranes (iPPROM) remains the Achilles' heel of keyhole fetal surgery (fetoscopy) despite significant efforts in preclinical models to develop new therapies. This limited success is partially due to incomplete understanding why the fetal membranes rupture early after fetoscopy and notable differences in membrane physiology between humans and domestic species. In this review, we summarize aspects of fetoscopy that may contribute to iPPROM, the previous efforts to develop new therapies, and limitations of preclinical models commonly used in fetal membrane research.
Collapse
Affiliation(s)
- Benjamin J Amberg
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia, .,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia,
| | - Ryan J Hodges
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Karyn A Rodgers
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Kelly J Crossley
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
| | - Philip L J DeKoninck
- The Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia.,Department of Obstetrics and Gynaecology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| |
Collapse
|
46
|
McGillick EV, Te Pas AB, Croughan MK, Crossley KJ, Wallace MJ, Lee K, Thio M, DeKoninck PLJ, Dekker J, Flemmer AW, Cramer SJE, Hooper SB, Kitchen MJ. Increased end-expiratory pressures improve lung function in near-term newborn rabbits with elevated airway liquid volume at birth. J Appl Physiol (1985) 2021; 131:997-1008. [PMID: 34351817 DOI: 10.1152/japplphysiol.00918.2020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Approximately 53% of near-term newborns admitted to intensive care experience respiratory distress. These newborns are commonly delivered by cesarean section and have elevated airway liquid volumes at birth, which can cause respiratory morbidity. We investigated the effect of providing respiratory support with a positive end-expiratory pressure (PEEP) of 8 cmH2O on lung function in newborn rabbit kittens with elevated airway liquid volumes at birth. Near-term rabbits (30 days; term = 32 days) with airway liquid volumes that corresponded to vaginal delivery (∼7 mL/kg, control, n = 11) or cesarean section [∼37 mL/kg; elevated liquid (EL), n = 11] were mechanically ventilated (tidal volume = 8 mL/kg). The PEEP was changed after lung aeration from 0 to 8 to 0 cmH2O (control, n = 6; EL, n = 6), and in a separate group of kittens, PEEP was changed after lung aeration from 8 to 0 to 8 cmH2O (control, n = 5; EL, n = 5). Lung function (ventilator parameters, compliance, lung gas volumes, and distribution of gas within the lung) was evaluated using plethysmography and synchrotron-based phase-contrast X-ray imaging. EL kittens initially receiving 0 cmH2O PEEP had reduced functional residual capacities and lung compliance, requiring higher inflation pressures to aerate the lung compared with control kittens. Commencing ventilation with 8 cmH2O PEEP mitigated the adverse effects of EL, increasing lung compliance, functional residual capacity, and the uniformity and distribution of lung aeration, but did not normalize aeration of the distal airways. Respiratory support with PEEP supports lung function in near-term newborn rabbits with elevated airway liquid volumes at birth who are at a greater risk of suffering respiratory distress.NEW & NOTEWORTHY Term babies born by cesarean section have elevated airway liquid volumes, which predisposes them to respiratory distress. Treatments targeting molecular mechanisms to clear lung liquid are ineffective for term newborn respiratory distress. We showed that respiratory support with an end-expiratory pressure supports lung function in near-term rabbits with elevated airway liquid volumes at birth. This study provides further physiological understanding of lung function in newborns with elevated airway liquid volumes at risk of respiratory distress.
Collapse
Affiliation(s)
- Erin V McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Arjan B Te Pas
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Michelle K Croughan
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | - Kelly J Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Megan J Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Katie Lee
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | - Marta Thio
- Newborn Research, The Royal Women's Hospital, Melbourne, Victoria, Australia.,The Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, Victoria, Australia
| | - Philip L J DeKoninck
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia.,Division of Obstetrics and Fetal Medicine, Department of Obstetrics and Gynecology, Erasmus Medical Center University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Janneke Dekker
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Andreas W Flemmer
- Division of Neonatology, University Children's Hospital and Perinatal Centre, Ludwig-Maximilians University, Munich, Germany
| | - Sophie J E Cramer
- Division of Neonatology, Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,The Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| |
Collapse
|
47
|
Gaertner VD, Rüegger CM, O'Currain E, Kamlin COF, Hooper SB, Davis PG, Springer L. Physiological responses to facemask application in newborns immediately after birth. Arch Dis Child Fetal Neonatal Ed 2021; 106:381-385. [PMID: 33298407 DOI: 10.1136/archdischild-2020-320198] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 11/10/2020] [Accepted: 11/16/2020] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Application of a face mask may induce apnoea and bradycardia, possibly via the trigeminocardiac reflex (TCR). We aimed to describe rates of apnoea and bradycardia in term and late-preterm infants following facemask application during neonatal stabilisation and compare the effects of first facemask application with subsequent applications. DESIGN Subgroup analysis of a prospective, randomised trial comparing two face masks. SETTING Single-centre study in the delivery room PATIENTS: Infants>34 weeks gestational age at birth METHODS: Resuscitations were video recorded. Airway flow and pressure were measured using a flow sensor. The effect of first and subsequent facemask applications on spontaneously breathing infants were noted. When available, flow waveforms as well as heart rate (HR) were assessed 20 s before and 30 s after each facemask application. RESULTS In total, 128 facemask applications were evaluated. In eleven percent of facemask applications infants stopped breathing. The first application was associated with a higher rate of apnoea than subsequent applications (29% vs 8%, OR (95% CI)=4.76 (1.41-16.67), p=0.012). On aggregate, there was no change in median HR over time. In the interventions associated with apnoea, HR dropped by 38bpm [median (IQR) at time of facemask application: 134bpm (134-150) vs 96bpm (94-102) 20 s after application; p=0.25] and recovered within 30 s. CONCLUSIONS Facemask applications in term and late-preterm infants during neonatal stabilisation are associated with apnoea and this effect is more pronounced after the first compared with subsequent applications. Healthcare providers should be aware of the TCR and vigilant when applying a face mask to newborn infants. TRIAL REGISTRATION NUMBER ACTRN12616000768493.
Collapse
Affiliation(s)
- Vincent D Gaertner
- Newborn Research, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Christoph Martin Rüegger
- Newborn Research, Department of Neonatology, University Hospital and University of Zurich, Zurich, Switzerland
| | - Eoin O'Currain
- School of Medicine and National Maternity Hospital, University College Dublin, Dublin, Ireland
| | - C Omar Farouk Kamlin
- Newborn Research Centre and Neonatal Services, Royal Womens Hospital, Melbourne, Victoria, Australia.,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, Victoria, Australia.,Clinical Sciences Research, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Monash University, Clayton, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre and Neonatal Services, Royal Womens Hospital, Melbourne, Victoria, Australia.,Department of Obstetrics and Gynaecology, The University of Melbourne, Melbourne, Victoria, Australia.,Clinical Sciences Research, Murdoch Children's Research Institute, Melbourne, Victoria, Australia
| | - Laila Springer
- Department of Neonatology, University Clinic Tübingen, Tübingen, Baden-Württemberg, Germany
| |
Collapse
|
48
|
Stenning FJ, Polglase GR, te Pas AB, Crossley KJ, Kluckow M, Gill AW, Wallace EM, McGillick EV, Binder C, Blank DA, Roberts C, Hooper SB. Effect of maternal oxytocin on umbilical venous and arterial blood flows during physiological-based cord clamping in preterm lambs. PLoS One 2021; 16:e0253306. [PMID: 34138957 PMCID: PMC8211207 DOI: 10.1371/journal.pone.0253306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2020] [Accepted: 06/03/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Delayed umbilical cord clamping (UCC) after birth is thought to cause placental to infant blood transfusion, but the mechanisms are unknown. It has been suggested that uterine contractions force blood out of the placenta and into the infant during delayed cord clamping. We have investigated the effect of uterine contractions, induced by maternal oxytocin administration, on umbilical artery (UA) and venous (UV) blood flows before and after ventilation onset to determine whether uterine contractions cause placental transfusion in preterm lambs. METHODS AND FINDINGS At ~128 days of gestation, UA and UV blood flows, pulmonary arterial blood flow (PBF) and carotid arterial (CA) pressures and blood flows were measured in three groups of fetal sheep during delayed UCC; maternal oxytocin following mifepristone, mifepristone alone, and saline controls. Each successive uterine contraction significantly (p<0.05) decreased UV (26.2±6.0 to 14.1±4.5 mL.min-1.kg-1) and UA (41.2±6.3 to 20.7 ± 4.0 mL.min-1.kg-1) flows and increased CA pressure and flow (47.1±3.4 to 52.8±3.5 mmHg and 29.4±2.6 to 37.3±3.4 mL.min-1.kg-1). These flows and pressures were partially restored between contractions, but did not return to pre-oxytocin administration levels. Ventilation onset during DCC increased the effects of uterine contractions on UA and UV flows, with retrograde UA flow (away from the placenta) commonly occurring during diastole. CONCLUSIONS We found no evidence that amplification of uterine contractions with oxytocin increase placental transfusion during DCC. Instead they decreased both UA and UV flow and caused a net loss of blood from the lamb. Uterine contractions did, however, have significant cardiovascular effects and reduced systemic and cerebral oxygenation.
Collapse
Affiliation(s)
- Fiona J. Stenning
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Graeme R. Polglase
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Arjan B. te Pas
- Division of Neonatology, Department of Paediatrics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Kelly J. Crossley
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Martin Kluckow
- Department of Neonatalogy, Royal North Shore Hospital and University of Sydney, Sydney, New South Wales, Australia
| | - Andrew W. Gill
- Centre for Neonatal Research and Education, The University of Western Australia, Perth, Western Australia, Australia
| | - Euan M. Wallace
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Erin V. McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
| | - Corinna Binder
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
| | - Douglas A. Blank
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Newborn Research, The Royal Women’s Hospital, Melbourne, Australia
| | - Calum Roberts
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Paediatrics, Monash University, Melbourne, Australia
| | - Stuart B. Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Australia
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Australia
- * E-mail:
| |
Collapse
|
49
|
Selvaratnam RJ, Wallace EM, Treleaven S, Hooper SB, Davis PG, Davey MA. Does detection of fetal growth restriction improve neonatal outcomes? J Paediatr Child Health 2021; 57:677-683. [PMID: 33314475 DOI: 10.1111/jpc.15310] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/19/2020] [Accepted: 11/25/2020] [Indexed: 11/28/2022]
Abstract
AIM Timely delivery of fetal growth restriction (FGR) is a balance between avoiding stillbirth and minimising prematurity. We sought to assess the neonatal outcomes for babies suspected of FGR, both true and false positives. METHODS This population cohort study examined all singleton births in Victoria, Australia from 2000 to 2017 (n = 1 231 415). Neonatal morbidities associated with neonatal intensive care unit (NICU) admission were assessed for babies born ≥32 weeks' with severe FGR (<3rd centile) and babies with birthweight ≥10th centile who were iatrogenically delivered for suspected FGR. RESULTS Babies with severe FGR iatrogenically delivered for suspected FGR were more likely to require NICU admission than babies with severe FGR who were not detected (3.0% vs. 1.1%, P < 0.001). After adjusting for potential confounders, the odds of NICU admission were increased (adjusted odds ratio (aOR) = 3.00, 95% confidence interval = 2.45-3.67; P < 0.001). Rates of NICU admission were also higher in ≥10th centile babies iatrogenically delivered for suspected FGR than for ≥10th centile babies who entered labour spontaneously (1.8% vs. 0.5%, P < 0.001). After adjustments, the odds of NICU admission were increased (aOR = 3.91, 95% confidence interval = 3.40-4.49; P < 0.001). NICU admissions were associated with morbidities related to iatrogenic prematurity. CONCLUSIONS Detection and planned delivery of FGR reduces stillbirth but may be associated with increased neonatal morbidity related to iatrogenic prematurity.
Collapse
Affiliation(s)
- Roshan J Selvaratnam
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia.,Safer Care Victoria, Department of Health and Human Services, Victorian Government, Melbourne, Victoria, Australia
| | - Euan M Wallace
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia.,Safer Care Victoria, Department of Health and Human Services, Victorian Government, Melbourne, Victoria, Australia
| | - Sophie Treleaven
- Safer Care Victoria, Department of Health and Human Services, Victorian Government, Melbourne, Victoria, Australia
| | - Stuart B Hooper
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - Peter G Davis
- Newborn Research Centre, The Royal Women's Hospital, Melbourne, Victoria, Australia
| | - Mary-Ann Davey
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia.,Safer Care Victoria, Department of Health and Human Services, Victorian Government, Melbourne, Victoria, Australia
| |
Collapse
|
50
|
Morrison JL, Ayonrinde OT, Care AS, Clarke GD, Darby JRT, David AL, Dean JM, Hooper SB, Kitchen MJ, Macgowan CK, Melbourne A, McGillick EV, McKenzie CA, Michael N, Mohammed N, Sadananthan SA, Schrauben E, Regnault TRH, Velan SS. Seeing the fetus from a DOHaD perspective: discussion paper from the advanced imaging techniques of DOHaD applications workshop held at the 2019 DOHaD World Congress. J Dev Orig Health Dis 2021; 12:153-167. [PMID: 32955011 DOI: 10.1017/s2040174420000884] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Advanced imaging techniques are enhancing research capacity focussed on the developmental origins of adult health and disease (DOHaD) hypothesis, and consequently increasing awareness of future health risks across various subareas of DOHaD research themes. Understanding how these advanced imaging techniques in animal models and human population studies can be both additively and synergistically used alongside traditional techniques in DOHaD-focussed laboratories is therefore of great interest. Global experts in advanced imaging techniques congregated at the advanced imaging workshop at the 2019 DOHaD World Congress in Melbourne, Australia. This review summarizes the presentations of new imaging modalities and novel applications to DOHaD research and discussions had by DOHaD researchers that are currently utilizing advanced imaging techniques including MRI, hyperpolarized MRI, ultrasound, and synchrotron-based techniques to aid their DOHaD research focus.
Collapse
Affiliation(s)
- Janna L Morrison
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
| | - Oyekoya T Ayonrinde
- Fiona Stanley Hospital, Murdoch, WA, Australia
- Medical School, The University of Western Australia, Perth, WA, Australia
| | - Alison S Care
- The Robinson Research Institute and Adelaide Medical School, University of Adelaide, Adelaide, SA, Australia
| | - Geoffrey D Clarke
- Department of Radiology, University of Texas Health Science Center, San Antonio, TX, USA
| | - Jack R T Darby
- Early Origins of Adult Health Research Group, Health and Biomedical Innovation, UniSA: Clinical and Health Sciences, University of South Australia, Adelaide, SA, Australia
| | - Anna L David
- Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK
| | - Justin M Dean
- Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Stuart B Hooper
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- The Department of Obstetrics and Gynecology, Monash University, Melbourne, Victoria, Australia
| | - Marcus J Kitchen
- School of Physics and Astronomy, Monash University, Melbourne, Victoria, Australia
| | | | - Andrew Melbourne
- School of Biomedical Engineering and Imaging Sciences, Kings College London, London, UK
| | - Erin V McGillick
- The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
- The Department of Obstetrics and Gynecology, Monash University, Melbourne, Victoria, Australia
| | - Charles A McKenzie
- Department of Medical Biophysics, Western University, London, ON, Canada
- Lawson Health Research Institute and Children's Health Research Institute, London, ON, Canada
| | - Navin Michael
- Singapore Institute for Clinical Sciences, Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Nuruddin Mohammed
- Maternal Fetal Medicine Unit, Department of Obstetrics and Gynecology, Aga Khan University Hospital, Karachi, Pakistan
| | - Suresh Anand Sadananthan
- Singapore Institute for Clinical Sciences, Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| | - Eric Schrauben
- Translational Medicine, Hospital for Sick Children, Toronto, ON, Canada
| | - Timothy R H Regnault
- Lawson Health Research Institute and Children's Health Research Institute, London, ON, Canada
- Department of Obstetrics and Gynecology, Western University, London, ON, Canada
- Department of Physiology and Pharmacology, Western University, London, ON, Canada
| | - S Sendhil Velan
- Singapore Bioimaging Consortium, Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
- Singapore Institute for Clinical Sciences, Agency for Science, Technology, and Research (A*STAR), Singapore, Singapore
| |
Collapse
|