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Clyman RI, Hills NK. Prophylactic indomethacin and the risk of serious pulmonary hemorrhages in preterm infants less than 28 weeks' gestation. J Perinatol 2024:10.1038/s41372-024-01971-x. [PMID: 38658692 DOI: 10.1038/s41372-024-01971-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 04/09/2024] [Accepted: 04/11/2024] [Indexed: 04/26/2024]
Abstract
OBJECTIVE To determine if prophylactic indomethacin (PINDO) decreases serious pulmonary hemorrhages in infants <28 weeks. STUDY DESIGN Intention-to-treat analysis of 615 consecutively admitted infants during four alternating protocol-driven epochs of PINDO or expectant patent ductus arteriosus (PDA) management. RESULTS 41/615 (6.7%) developed serious pulmonary hemorrhage at 2 (1, 3) days (median (IQR)). In unadjusted and adjusted multivariable models, infants born in a PINDO epoch had significantly lower incidences of pulmonary hemorrhage and pulmonary hemorrhage or death before 7 days. There were less moderate/large PDA during PINDO epochs. The associations between PINDO and pulmonary hemorrhage and pulmonary hemorrhage/death were no longer significant when presence of a PDA was included in the analyses. There was no apparent association between PINDO epochs and the incidence of serious intraventricular hemorrhages. CONCLUSION Even though PINDO no longer appears to affect the incidence of sIVH it still is associated with a lower incidence of pulmonary hemorrhage.
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Affiliation(s)
- Ronald I Clyman
- Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA.
- Department of Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, USA.
| | - Nancy K Hills
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
- Department of Neurology, University of California San Francisco, San Francisco, CA, USA
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2
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Clyman RI, Hills NK. Patent ductus arteriosus (PDA) and pulmonary morbidity: can early targeted pharmacologic PDA treatment decrease the risk of bronchopulmonary dysplasia? Semin Perinatol 2023; 47:151718. [PMID: 36882361 DOI: 10.1016/j.semperi.2023.151718] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
A persistent left-to-right shunt through a patent ductus arteriosus (PDA) increases the rate of pulmonary hydrostatic fluid filtration, impairs pulmonary mechanics, and prolongs the need for respiratory support. Infants with a moderate/large PDA shunt that persists for more than 7-14 days are at increased risk for developing bronchopulmonary dysplasia (BPD) if they also require invasive ventilation for more than 10 days. In contrast, infants who require invasive ventilation for less than 10 days have similar rates of BPD no matter how long they are exposed to a moderate/large PDA shunt. Although pharmacologic PDA closure decreases the risk of abnormal early alveolar development in preterm baboons that are ventilated for 2 weeks, the findings from recent randomized controlled trials, as well as a quality improvement project, suggest that routine early targeted pharmacologic treatments, as currently employed, do not appear to alter the incidence of BPD in human infants.
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Affiliation(s)
- Ronald I Clyman
- Departments of Pediatrics and the Cardiovascular Research Institute, Emeritus, Pediatrics, University of California San Francisco, 513 Parnassus Ave, San Francisco, CA 94143-0734, United States.
| | - Nancy K Hills
- Departments of Neurology and Epidemiology and Biostatistics, Neurology, University of California San Francisco, United States
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Backes CH, Hill KD, Shelton EL, Slaughter JL, Lewis TR, Weisz DE, Mah ML, Bhombal S, Smith CV, McNamara PJ, Benitz WE, Garg V. Patent Ductus Arteriosus: A Contemporary Perspective for the Pediatric and Adult Cardiac Care Provider. J Am Heart Assoc 2022; 11:e025784. [PMID: 36056734 PMCID: PMC9496432 DOI: 10.1161/jaha.122.025784] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The burden of patent ductus arteriosus (PDA) continues to be significant. In view of marked differences in preterm infants versus more mature, term counterparts (viewed on a continuum with adolescent and adult patients), mechanisms regulating ductal patency, genetic contributions, clinical consequences, and diagnostic and treatment thresholds are discussed separately, when appropriate. Among both preterm infants and older children and adults, a range of hemodynamic profiles highlighting the markedly variable consequences of the PDA are provided. In most contemporary settings, transcatheter closure is preferable over surgical ligation, but data on longer-term outcomes, particularly among preterm infants, are lacking. The present review provides recommendations to identify gaps in PDA diagnosis, management, and treatment on which subsequent research can be developed. Ultimately, the combination of refined diagnostic thresholds and expanded treatment options provides the best opportunities to address the burden of PDA. Although fundamental gaps remain unanswered, the present review provides pediatric and adult cardiac care providers with a contemporary framework in PDA care to support the practice of evidence-based medicine.
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Affiliation(s)
- Carl H Backes
- Center for Perinatal Research The Abigail Wexner Research Institute at Nationwide Children's Hospital Columbus OH
- Division of Neonatology Nationwide Children's Hospital Columbus OH
- Department of Pediatrics The Ohio State University College of Medicine Columbus OH
- The Heart Center Nationwide Children's Hospital Columbus OH
| | - Kevin D Hill
- Duke University Pediatric and Congenital Heart Disease Center Durham NC
- Duke Clinical Research Institute Durham NC
| | - Elaine L Shelton
- Department of Pediatrics Vanderbilt University Medical Center Nashville TN
- Department of Pharmacology Vanderbilt University Medical Center Nashville TN
| | - Jonathan L Slaughter
- Center for Perinatal Research The Abigail Wexner Research Institute at Nationwide Children's Hospital Columbus OH
- Division of Neonatology Nationwide Children's Hospital Columbus OH
- Department of Pediatrics The Ohio State University College of Medicine Columbus OH
- Division of Epidemiology, College of Public Health The Ohio State University Columbus OH
| | - Tamorah R Lewis
- Division of Neonatology Children's Mercy-Kansas City Kansas City MO
- Division of Clinical Pharmacology, Toxicology and Therapeutic Innovation Children's Mercy-Kansas City Kansas City MO
- Department of Pediatrics University of Missouri-Kansas City School of Medicine Kansas City MO
| | - Dany E Weisz
- Department of Paediatrics University of Toronto Ontario Canada
- Department of Newborn and Developmental Paediatrics Sunnybrook Health Science Center Toronto Ontario Canada
| | - May Ling Mah
- Department of Pediatrics The Ohio State University College of Medicine Columbus OH
- The Heart Center Nationwide Children's Hospital Columbus OH
| | - Shazia Bhombal
- Division of Neonatal and Developmental Medicine, Department of Pediatrics Stanford University School of Medicine, Lucille Packard Children's Hospital Stanford CA
| | - Charles V Smith
- Center for Integrated Brain Research University of Washington School of Medicine Seattle WA
| | - Patrick J McNamara
- Department of Pediatrics University of Iowa Iowa City IA
- Department of Internal Medicine University of Iowa Iowa City IA
| | - William E Benitz
- Division of Neonatal and Developmental Medicine, Department of Pediatrics Stanford University School of Medicine, Lucille Packard Children's Hospital Stanford CA
| | - Vidu Garg
- Department of Pediatrics The Ohio State University College of Medicine Columbus OH
- The Heart Center Nationwide Children's Hospital Columbus OH
- Center for Cardiovascular Research The Abigail Wexner Research Institute at Nationwide Children's Hospital Columbus OH
- Department of Molecular Genetics The Ohio State University Columbus OH
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Spaziani G, Bennati E, Marrone C, Lucà F, Iorio A, Rao CM, Di Fusco SA, Russo MG, Colivicchi F, Gabrielli D, Santoro G, Favilli S, Gulizia MM. Pathophysiology and clinical presentation of paediatric heart failure related to congenital heart disease. Acta Paediatr 2021; 110:2336-2343. [PMID: 33948967 DOI: 10.1111/apa.15904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/26/2021] [Accepted: 04/30/2021] [Indexed: 11/30/2022]
Abstract
Congenital heart disease (CHD) and cardiomyopathies represent the two most important causes of paediatric heart failure (HF) in developed countries. We made a review of the literature on pathophysiology and clinical presentation of paediatric HF in children with CHD. Two main pathophysiologic models can be identified: the 'over-circulation failure', characterised by signs and symptoms of congestion or hypoperfusion, due respectively to volume or pressure overload, and the 'pump failure'. CONCLUSIONS: The comprehension of the HF pathophysiology in paediatric patients with CHD is of paramount importance for the optimal management and for addressing the best therapeutic choices.
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Affiliation(s)
- Gaia Spaziani
- Pediatric Cardiology Azienda Ospedaliera Universitaria Meyer Florence Italy
| | - Elena Bennati
- Pediatric Cardiology Azienda Ospedaliera Universitaria Meyer Florence Italy
| | - Chiara Marrone
- Pediatric Cardiology Fondazione G. Monasterio CNR‐Regione Toscana Massa Italy
| | - Fabiana Lucà
- Division of Cardiology Big Metropolitan Hospital Reggio Calabria Italy
| | - Annamaria Iorio
- Division of Cardiology Azienda Ospedaliera Papa Giovanni XXIII Bergamo Italy
| | | | | | - Maria Giovanna Russo
- Pediatric Cardiology Department of Cardiology Monaldi Hospital, “L. Vanvitelli” University Naples Italy
| | - Furio Colivicchi
- UOC Cardiologia Clinica e Riabilitativa San Filippo Neri Hospital Rome Italy
| | | | - Giuseppe Santoro
- Pediatric Cardiology Fondazione G. Monasterio CNR‐Regione Toscana Massa Italy
| | - Silvia Favilli
- Pediatric Cardiology Azienda Ospedaliera Universitaria Meyer Florence Italy
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5
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Clyman RI, Liebowitz M, Kaempf J, Erdeve O, Bulbul A, Håkansson S, Lindqvist J, Farooqi A, Katheria A, Sauberan J, Singh J, Nelson K, Wickremasinghe A, Dong L, Hassinger DC, Aucott SW, Hayashi M, Heuchan AM, Carey WA, Derrick M, Fernandez E, Sankar M, Leone T, Perez J, Serize A. PDA-TOLERATE Trial: An Exploratory Randomized Controlled Trial of Treatment of Moderate-to-Large Patent Ductus Arteriosus at 1 Week of Age. J Pediatr 2019; 205:41-48.e6. [PMID: 30340932 PMCID: PMC6502709 DOI: 10.1016/j.jpeds.2018.09.012] [Citation(s) in RCA: 139] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 08/11/2018] [Accepted: 09/06/2018] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To compare early routine pharmacologic treatment of moderate-to-large patent ductus arteriosus (PDA) at the end of week 1 with a conservative approach that requires prespecified respiratory and hemodynamic criteria before treatment can be given. STUDY DESIGN A total of 202 neonates of <28 weeks of gestation age (mean, 25.8 ± 1.1 weeks) with moderate-to-large PDA shunts were enrolled between age 6 and 14 days (mean, 8.1 ± 2.2 days) into an exploratory randomized controlled trial. RESULTS At enrollment, 49% of the patients were intubated and 48% required nasal ventilation or continuous positive airway pressure. There were no differences between the groups in either our primary outcome of ligation or presence of a PDA at discharge (early routine treatment [ERT], 32%; conservative treatment [CT], 39%) or any of our prespecified secondary outcomes of necrotizing enterocolitis (ERT, 16%; CT, 19%), bronchopulmonary dysplasia (BPD) (ERT, 49%; CT, 53%), BPD/death (ERT, 58%; CT, 57%), death (ERT,19%; CT, 10%), and weekly need for respiratory support. Fewer infants in the ERT group met the rescue criteria (ERT, 31%; CT, 62%). In secondary exploratory analyses, infants receiving ERT had significantly less need for inotropic support (ERT, 13%; CT, 25%). However, among infants who were ≥26 weeks gestational age, those receiving ERT took significantly longer to achieve enteral feeding of 120 mL/kg/day (median: ERT, 14 days [range, 4.5-19 days]; CT, 6 days [range, 3-14 days]), and had significantly higher incidences of late-onset non-coagulase-negative Staphylococcus bacteremia (ERT, 24%; CT,6%) and death (ERT, 16%; CT, 2%). CONCLUSIONS In preterm infants age <28 weeks with moderate-to-large PDAs who were receiving respiratory support after the first week, ERT did not reduce PDA ligations or the presence of a PDA at discharge and did not improve any of the prespecified secondary outcomes, but delayed full feeding and was associated with higher rates of late-onset sepsis and death in infants born at ≥26 weeks of gestation. TRIAL REGISTRATION ClinicalTrials.gov: NCT01958320.
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Affiliation(s)
- Ronald I. Clyman
- Department of Pediatrics, Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA,Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA
| | - Melissa Liebowitz
- Department of Pediatrics, Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA
| | - Joseph Kaempf
- Department of Pediatrics, Providence St. Vincent Medical Center, Portland, OR
| | - Omer Erdeve
- Department of Pediatrics, Ankara University School of Medicine Children’s Hospital, Ankara
| | - Ali Bulbul
- Department of Pediatrics, Sisli Hamidiye Etfal Training and Research Hospital, İstanbul, Turkey
| | | | | | - Aijaz Farooqi
- Department of Pediatrics, Umea University Hospital, Umea, Sweden
| | - Anup Katheria
- Department of Pediatrics, Sharp Mary Birch Hospital, San Diego, CA
| | - Jason Sauberan
- Department of Pediatrics, Sharp Mary Birch Hospital, San Diego, CA
| | - Jaideep Singh
- Department of Pediatrics, University of Chicago, Chicago, IL
| | - Kelly Nelson
- Department of Pediatrics, University of Chicago, Chicago, IL
| | - Andrea Wickremasinghe
- Department of Pediatrics, Kaiser Permanente Santa Clara Medical Center, Santa Clara, CA
| | - Lawrence Dong
- Department of Pediatrics, Kaiser Permanente Santa Clara Medical Center, Santa Clara, CA
| | | | - Susan W. Aucott
- Department of Pediatrics, Johns Hopkins University, Baltimore, MD
| | - Madoka Hayashi
- Department of Pediatrics, Johns Hopkins University, Baltimore, MD
| | - Anne Marie Heuchan
- Department of Pediatrics, University of Glasgow, Royal Hospital for Sick Children, Glasgow, Scotland, United Kingdom
| | | | - Matthew Derrick
- Department of Pediatrics, Northshore University Health System, Evanston, IL
| | - Erika Fernandez
- Department of Pediatrics, University of California San Diego and Rady Children’s Hospital, San Diego
| | - Meera Sankar
- Department of Pediatrics, Good Samaritan Hospital, San Jose, CA
| | - Tina Leone
- Department of Pediatrics, Columbia University Medical Center, New York, NY
| | - Jorge Perez
- Department of Pediatrics, South Miami Hospital/Baptist Health South Florida, Miami, FL
| | - Arturo Serize
- Department of Pediatrics, South Miami Hospital/Baptist Health South Florida, Miami, FL
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6
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Abstract
A persistent left-to-right shunt through a patent ductus arteriosus (PDA) increases the rate of hydrostatic fluid filtration into the lung's interstitium, impairs pulmonary mechanics, and prolongs the need for mechanical ventilation. In preclinical trials, pharmacologic PDA closure leads to improved alveolarization and minimizes the impaired postnatal alveolar development that is the pathologic hallmark of bronchopulmonary dysplasia (BPD). Although routine prophylactic treatment of a PDA on the day of birth does not appear to offer any more protection against BPD than delaying treatment for 2-3 days, recent evidence from quality improvement trials suggests that early pharmacologic treatment decreases the incidence of BPD compared with a treatment approach that exposes infants to a moderate-to-large PDA shunt for the first 7-10 days after birth. After the first week, routine pharmacologic treatment (compared with continued PDA exposure) no longer appears to alter the course of BPD development. Evidence from epidemiologic, preclinical, and randomized controlled trials demonstrate that early ductus ligation is an independent risk factor for the development of BPD.
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Affiliation(s)
- Ronald I Clyman
- Cardiovascular Research Institute, Departments of Pediatrics and the Cardiovascular Research Institute, University of California, San Francisco, UCSF Box 1346, HSW 1408, 513 Parnassus Ave, San Francisco, CA 94143-1346.
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7
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Treatment and Nontreatment of the Patent Ductus Arteriosus: Identifying Their Roles in Neonatal Morbidity. J Pediatr 2017; 189:13-17. [PMID: 28709633 PMCID: PMC5639904 DOI: 10.1016/j.jpeds.2017.06.054] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 06/22/2017] [Indexed: 11/23/2022]
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8
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Pharmacologic Treatment of Patent Ductus Arteriosus in the Preterm Infant. J Perinat Neonatal Nurs 2016; 30:6-8. [PMID: 26813387 DOI: 10.1097/jpn.0000000000000157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Abstract
A persistent left-to-right shunt through a patent ductus arteriosus (PDA) increases the rate of hydrostatic fluid filtration into the lung's interstitium, impairs pulmonary mechanics, and prolongs the need for mechanical ventilation. In preclinical trials, pharmacologic PDA closure leads to improved alveolarization and minimizes the impaired postnatal alveolar development that is the pathologic hallmark of the "new bronchopulmonary dysplasia (BPD)". Although early pharmacologic closure of the PDA decreases the incidence of pulmonary hemorrhage, intraventricular hemorrhage, and the need for PDA ligation, there is little evidence from controlled, clinical trials to support or refute a causal role for the PDA in the development of BPD. However, evidence from epidemiologic, preclinical, and randomized controlled clinical trials demonstrate that early ductus ligation is an independent risk factor for the development of BPD and may directly contribute to the neonatal morbidities it is trying to prevent.
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Affiliation(s)
- Ronald I Clyman
- Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA.
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10
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Chiruvolu A, Jaleel MA. Pathophysiology of patent ductus arteriosus in premature neonates. Early Hum Dev 2009; 85:143-6. [PMID: 19223128 DOI: 10.1016/j.earlhumdev.2008.12.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Accepted: 12/11/2008] [Indexed: 11/28/2022]
Abstract
Failure of complete postnatal closure of the ductus arteriosus is associated with various neonatal morbidities. Functional closure resulting from smooth muscle constriction and permanent anatomic closure due to vascular remodeling are the results of a complex interaction of different mechanisms. Prostaglandins, oxygen, nitric oxide and various other factors play a key role in ductal closure. An understanding of the role of these factors, involved both in maintenance of vascular tone of the ductus in fetal life as well as stimulation of ductal closure in postnatal life, and the cardiovascular and respiratory consequences of a patent ductus arteriosus, is important for the clinician involved in management of premature neonates.
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Affiliation(s)
- Arpitha Chiruvolu
- Department of Pediatrics, Division of Neonatology, Baylor University Medical Center, Dallas, Texas 75246, USA.
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11
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Abstract
Bronchopulmonary dysplasia (BPD), initially described 40 years ago, is a dynamic clinical entity that continues to affect tens of thousands of premature infants each year. BPD was first characterized as a fibrotic pulmonary endpoint following severe Respiratory Distress Syndrome (RDS). It was the result of pulmonary healing after RDS, high oxygen exposure, positive pressure ventilation, and poor bronchial drainage secondary to endotracheal intubation in premature infants. With improved treatment for RDS, including surfactant replacement, oxygen saturation monitoring, improved modes of mechanical ventilation, antibiotic therapies, nutritional support, and infants surviving at younger gestations, the clinical picture of BPD has changed. In the following pages, we will summarize the multifaceted pathophysiologic factors leading to the pulmonary changes in "new" BPD, which is primarily characterized by disordered or delayed development. The contribution of hyperoxia and hypoxia, mechanical forces, vascular maldevelopment, inflammation, fluid management, patent ductus arteriosus (PDA), nutrition, and genetics will be discussed.
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Affiliation(s)
- Patricia R Chess
- Department of Pediatrics, University of Rochester, Rochester, NY 14642, USA.
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12
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Abstract
A patent ductus arteriosus (PDA) results in increased pulmonary blood flow and redistribution of flow to other organs. Several co-morbidities (i.e., necrotizing enterocolitis, intracranial hemorrhage, pulmonary edema/hemorrhage, bronchopulmonary dysplasia, and retinopathy) are associated with the presence of a PDA, but whether or not a PDA is responsible for their development is still unclear. In this review, comparative physiology between the full term and preterm newborn and the barriers preventing the necessary cascade of events leading to permanent constriction of the PDA are reviewed.
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Affiliation(s)
- Ronald I Clyman
- School of Medicine, Cardiovascular Research Institute, University of California, San Francisco, Calif., USA.
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13
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Abstract
A persistent ductus arteriosus is a common event in preterm infants. The systemic-to-pulmonary shunting that occurs as the pulmonary vascular resistance decreases after birth can have significant cardiovascular and respiratory consequences. Acute pulmonary effects include pulmonary edema and hemorrhage, worsened lung mechanics and deterioration in gas exchange with hypoxemia and hypercapnia. The increased pulmonary blood flow can also produce damage to the capillary endothelium and trigger an inflammatory cascade. This, plus the need for longer and more aggressive mechanical ventilation, can explain the association between patent ductus arteriosus and an increased risk for bronchopulmonary dysplasia in extremely premature infants.
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Affiliation(s)
- Eduardo Bancalari
- Division of Newborn Medicine, Department of Pediatrics, University Miami Miller School of Medicine, Miami, Florida 33101, USA.
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Ikegami M, Jobe AH, Tabor BL, Rider ED, Lewis JF. Lung albumin recovery in surfactant-treated preterm ventilated lambs. THE AMERICAN REVIEW OF RESPIRATORY DISEASE 1992; 145:1005-8. [PMID: 1586040 DOI: 10.1164/ajrccm/145.5.1005] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Preterm ventilated animals and infants with respiratory distress syndrome (RDS) develop proteinaceous alveolar edema. To study the effect of postnatal age on intravascular radiolabeled albumin accumulation into lungs, preterm lambs at 132 days gestational age were ventilated after treatment with sheep surfactant or cow surfactant extract for periods as long as 24 h. Lambs not treated with surfactant were studied for only 5 h because of severe respiratory failure. All lambs were given radiolabeled albumin by intravascular injection 1 h before they were killed, and the net recovery of the labeled albumin was measured in the lung tissue and air space as quantified by alveolar lavage. Net 1-h radiolabeled albumin recoveries in the lungs decreased from 5 to 6% soon after birth to 0.9% at 24 h in the surfactant-treated groups (p less than 0.01). At 3 h there was less labeled albumin recovery by alveolar lavages in lambs treated with sheep surfactant than in control lambs and lambs treated with cow surfactant extract (p less than 0.05). Protein in alveolar washes from lambs treated with cow surfactant extract exceeded that in lambs treated with sheep surfactant at 3 h (p less than 0.05), but protein recoveries had decreased to similar values by 24 h, indicating a net clearance of air-space protein. These studies demonstrate a sixfold decrease in net albumin accumulation from birth to 24 h of age despite continued ventilation and oxygen exposure of the premature lamb lungs.
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Affiliation(s)
- M Ikegami
- Harbor-UCLA Medical Center, Department of Pediatrics, Torrance
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16
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Clyman RI. Persistent patent ductus arteriosus. Int J Technol Assess Health Care 1991; 7 Suppl 1:70-8. [PMID: 2037442 DOI: 10.1017/s026646230001254x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Two observations about the ductus arteriosus are established: most normally developed infants will have a patent ductus arteriosus (PDA) at the time of delivery, and most fullterm infants will have anatomic obliteration of the ductus lumen by 3–6 months of age. Studies designed to determine how a PDA contributes to an infant's morbidity or when a PDA becomes a persistently patent ductus arteriosus have been hampered by the lack of consistent diagnostic criteria for defining the condition. Ellison et al. (22) attempted to evaluate several commonly used criteria for diagnosing a large leftto-right shunt through the ductus arteriosus by noting the occurrence of each sign both before and 36–48 hours after surgical ligation. No single criterion sufficed as an indicator of PDA. Certain signs, such as continuous murmur or hyperactive left ventricular impulse, were specific for a PDA, but lacked sensitivity; conversely, M-mode echocardiography and ventilatory support criteria were very sensitive but lacked specificity.
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Affiliation(s)
- R I Clyman
- Mt. Zion Hospital and Medical Center, San Francisco
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17
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Balsan MJ, Jones JG, Guthrie RD. Effects of a clinically detectable PDA on pulmonary mechanics measures in VLBW infants with RDS. Pediatr Pulmonol 1991; 11:161-5. [PMID: 1758734 DOI: 10.1002/ppul.1950110214] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We examined the effect of a clinically detectable patent ductus arteriosus (PDA) and its successful treatment with indomethacin on serial measures of pulmonary mechanics in 10 very-low-birthweight (VLBW) intubated infants with respiratory distress syndrome (RDS). Pulmonary mechanics were measured by the passive expiratory flow technique. Total respiratory system compliance (Crs) gradually improved as RDS resolved. However, a significant decrease in mean Crs was associated with the development of a clinically detectable PDA, ranging from 1.51 +/- 0.21 to 0.90 +/- 0.08 mL/cmH2O/m (P less than 0.05). We also noted an increase in mean Crs, from 0.90 +/- 0.08 to 1.49 +/- 0.21 mL/cmH2O/m (P less than 0.05), after successful treatment of a PDA with indomethacin. Total respiratory system resistance (Rrs) did not change. We conclude that a clinically significant PDA is associated with a decreased Crs and that successful treatment of a PDA with indomethacin is associated with an improvement in lung compliance. These findings imply that the development of a clinically detectable PDA and its subsequent treatment complicates the interpretation of pulmonary mechanics data in VLBW infants with RDS.
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Affiliation(s)
- M J Balsan
- Department of Pediatrics, Magee Womens Hospital, University of Pittsburgh School of Medicine, PA 15213
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