1
|
Jaeger KM, Nissen M, Rahm S, Titzmann A, Fasching PA, Beilner J, Eskofier BM, Leutheuser H. Power-MF: robust fetal QRS detection from non-invasive fetal electrocardiogram recordings. Physiol Meas 2024; 45:055009. [PMID: 38722552 DOI: 10.1088/1361-6579/ad4952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 05/09/2024] [Indexed: 05/22/2024]
Abstract
Objective.Perinatal asphyxia poses a significant risk to neonatal health, necessitating accurate fetal heart rate monitoring for effective detection and management. The current gold standard, cardiotocography, has inherent limitations, highlighting the need for alternative approaches. The emerging technology of non-invasive fetal electrocardiography shows promise as a new sensing technology for fetal cardiac activity, offering potential advancements in the detection and management of perinatal asphyxia. Although algorithms for fetal QRS detection have been developed in the past, only a few of them demonstrate accurate performance in the presence of noise and artifacts.Approach.In this work, we proposePower-MF, a new algorithm for fetal QRS detection combining power spectral density and matched filter techniques. We benchmarkPower-MFagainst three open-source algorithms on two recently published datasets (Abdominal and Direct Fetal ECG Database: ADFECG, subsets B1 Pregnancy and B2 Labour; Non-invasive Multimodal Foetal ECG-Doppler Dataset for Antenatal Cardiology Research: NInFEA).Main results.Our results show thatPower-MFoutperforms state-of-the-art algorithms on ADFECG (B1 Pregnancy: 99.5% ± 0.5% F1-score, B2 Labour: 98.0% ± 3.0% F1-score) and on NInFEA in three of six electrode configurations by being more robust against noise.Significance.Through this work, we contribute to improving the accuracy and reliability of fetal cardiac monitoring, an essential step toward early detection of perinatal asphyxia with the long-term goal of reducing costs and making prenatal care more accessible.
Collapse
Affiliation(s)
- Katharina M Jaeger
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
| | - Michael Nissen
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
| | - Simone Rahm
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
| | - Adriana Titzmann
- Department of Gynecology and Obstetrics, Erlangen University Hospital, Universitätsstraße 21-23, 91054 Erlangen, Germany
| | - Peter A Fasching
- Department of Gynecology and Obstetrics, Erlangen University Hospital, Universitätsstraße 21-23, 91054 Erlangen, Germany
| | - Janina Beilner
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
| | - Bjoern M Eskofier
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
- Translational Digital Health Group, Institute of AI for Health, Helmholtz Zentrum München-German Research Center for Environmental Health, Neuherberg, Germany
| | - Heike Leutheuser
- Friedrich-Alexander-Universitat Erlangen-Nürnberg, Machine Learning and Data Analytics Lab, Carl-Thiersch-Straße 2b, 91052 Erlangen, Germany
| |
Collapse
|
2
|
Plunkett BA, Weiner SJ, Saade GR, Belfort MA, Blackwell SC, Thorp JM, Tita ATN, Miller RS, McKenna DS, Chien EKS, Rouse DJ, El-Sayed YY, Sorokin Y, Caritis SN. Maternal Diabetes and Intrapartum Fetal Electrocardiogram. Am J Perinatol 2024; 41:e14-e21. [PMID: 35381609 PMCID: PMC9532457 DOI: 10.1055/a-1817-5788] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
OBJECTIVE Fetal electrocardiogram (ECG) ST changes are associated with fetal cardiac hypoxia. Our objective was to evaluate ST changes by maternal diabetic status and stage of labor. METHODS This was a secondary analysis of a multicentered randomized-controlled trial in which laboring patients with singleton gestations underwent fetal ECG scalp electrode placement and were randomly assigned to masked or unmasked ST-segment readings. Our primary outcome was the frequency of fetal ECG tracings with ST changes by the stage of labor. ECG tracings were categorized into mutually exclusive groups (ST depression, ST elevation without ST depression, or no ST changes). We compared participants with DM, gestational diabetes mellitus (GDM), and no DM. RESULTS Of the 5,436 eligible individuals in the first stage of labor (95 with pregestational DM and 370 with GDM), 4,427 progressed to the second stage. ST depression occurred more frequently in the first stage of labor in participants with pregestational DM (15%, adjusted odds ratio [aOR] 2.20, 95% confidence interval [CI] 1.14-4.24) and with GDM (9.5%, aOR 1.51, 95% CI 1.02-2.25) as compared with participants without DM (5.7%). The frequency of ST elevation was similar in participants with pregestational DM (33%, aOR 0.79, 95% CI 0.48-1.30) and GDM (33.2%, aOR 0.91, 95% CI 0.71-1.17) as compared with those without DM (34.2%). In the second stage, ST depression did not occur in participants with pregestational DM (0%) and occurred more frequently in participants with GDM (3.5%, aOR 2.01, 95% CI 1.02-3.98) as compared with those without DM (2.0%). ST elevation occurred more frequently in participants with pregestational DM (30%, aOR 1.81, 95% CI 1.02-3.22) but not with GDM (19.0%, aOR 1.06, 95% CI 0.77-1.47) as compared with those without DM (17.8%). CONCLUSION ST changes in fetal ECG occur more frequently in fetuses of diabetic mothers during labor. CLINICALTRIALS gov number, NCT01131260. PRECIS ST changes in fetal ECG, a marker of fetal cardiac hypoxia, occur more frequently in fetuses of diabetic parturients. KEY POINTS · Fetal hypertrophic cardiomyopathy (HCM) and cardiac dysfunction occur frequently among fetuses of diabetic patients.. · Fetal ECG changes such as ST elevation and depression reflect cardiac hypoxia.. · Fetuses of diabetic patients demonstrate a higher prevalence of fetal ECG tracings with ST changes..
Collapse
Affiliation(s)
- Beth A Plunkett
- Department of Obstetrics and Gynecology of Northwestern University, Chicago, Illinois
| | - Steven J Weiner
- the George Washington University Biostatistics Center, Washington, Dist. Of Columbia
| | | | | | - Sean C Blackwell
- University of Texas Health Science Center at Houston, McGovern Medical School-Children's Memorial Hermann Hospital, Houston, Texas
| | - John M Thorp
- University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Alan T N Tita
- University of Alabama at Birmingham, Birmingham, Alabama
| | | | | | - Edward K S Chien
- MetroHealth Medical Center-Case Western Reserve University, Cleveland, Ohio
| | | | | | | | | |
Collapse
|
3
|
Blix E, Brurberg KG, Reierth E, Reinar LM, Øian P. ST waveform analysis vs cardiotocography alone for intrapartum fetal monitoring: An updated systematic review and meta-analysis of randomized trials. Acta Obstet Gynecol Scand 2024; 103:437-448. [PMID: 38093630 PMCID: PMC10867373 DOI: 10.1111/aogs.14752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 10/25/2023] [Accepted: 11/23/2023] [Indexed: 02/16/2024]
Abstract
INTRODUCTION ST waveform analysis (STAN) was introduced as an adjunct to cardiotocography (CTG) to improve neonatal and maternal outcomes. The aim of the present study was to quantify the efficacy of STAN vs CTG and assess the quality of the evidence using GRADE. MATERIAL AND METHODS We performed systematic literature searches to identify randomized controlled trials and assessed included studies for risk of bias. We performed meta-analyses, calculating pooled risk ratio (RR) or Peto odds ratio (OR). We also performed post hoc trial sequential analyses for selected outcomes to assess the risk of false-positive results and the need for additional studies. RESULTS Nine randomized controlled trials including 28 729 women were included in the meta-analysis. There were no differences between the groups in operative deliveries for fetal distress (10.9 vs 11.1%; RR 0.96; 95% confidence interval [CI] 0.82-1.11). STAN was associated with a significantly lower rate of metabolic acidosis (0.45% vs 0.68%; Peto OR 0.66; 95% CI 0.48-0.90). Accordingly, 441 women need to be monitored with STAN instead of CTG alone to prevent one case of metabolic acidosis. Women allocated to STAN had a reduced risk of fetal blood sampling compared with women allocated to conventional CTG monitoring (12.5% vs 19.6%; RR 0.62; 95% CI 0.49-0.80). The quality of the evidence was high to moderate. CONCLUSIONS Absolute effects of STAN were minor and the clinical significance of the observed reduction in metabolic acidosis is questioned. There is insufficient evidence to state that STAN as an adjunct to CTG leads to important clinical benefits compared with CTG alone.
Collapse
Affiliation(s)
- Ellen Blix
- Faculty of Health SciencesOslo Metropolitan UniversityOsloNorway
| | - Kjetil Gundro Brurberg
- The Norwegian Institute of Public HealthOsloNorway
- Center for Evidence Based PracticeWestern Norway University of Applied SciencesBergenNorway
| | - Eirik Reierth
- Science and Health LibraryUniversity Library, UiT The Arctic University of NorwayTromsøNorway
| | | | - Pål Øian
- Department of Obstetrics and GynecologyUniversity Hospital of North NorwayTromsøNorway
| |
Collapse
|
4
|
Benton M, Salter A, Wilkinson C, Simpson B, Turnbull D. Psychosocial outcomes from one cohort participating in the STan Australian Randomised controlled Trial (START). Birth 2024. [PMID: 38305668 DOI: 10.1111/birt.12815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 02/03/2024]
Abstract
BACKGROUND In an Australian randomized controlled trial (RCT), two techniques for intrapartum fetal surveillance were compared: ST analysis (STan) as an adjunct to cardiotocography (CTG), compared with CTG alone. The aim was to determine whether CTG + STan could reduce emergency cesarean birth rates while maintaining or improving neonatal outcomes. Secondary aims were to compare clinical, economic, and psychosocial outcomes. The purpose of this paper was to present psychosocial outcomes from one cohort enrolled in the trial. METHODS The study was conducted at one tertiary referral hospital. Participants who had taken part in the trial from the outset were invited to complete a questionnaire between March 2018 and January 2020, approximately 8 weeks after giving birth. Outcomes included depression, psychological distress, health-related quality of life, and infant feeding practices. Analysis was by intention to treat. RESULTS N = 207/527 participants completed the questionnaire (n = 113, STan; n = 94, CTG alone). Overall, no statistically significant or clinically meaningful differences were found in the two groups for symptoms of depression, psychological distress, quality of life, or infant feeding. A statistically significant difference was observed for the subscale of pain-discomfort, where scores were higher on average in the CTG alone arm relative to that in the CTG + STan arm. CONCLUSIONS Although STan as an adjunct to CTG constitutes a different clinical technology from CTG alone, both monitoring types appeared to produce similar results in terms of postnatal psychosocial outcomes for women. Findings from this study provide service users and staff with a comprehensive assessment of STan that can be used to make evidence-informed decisions about monitoring options should STan become more widely available.
Collapse
Affiliation(s)
- Madeleine Benton
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia
| | - Amy Salter
- School of Public Health, University of Adelaide, Adelaide, South Australia, Australia
| | - Chris Wilkinson
- Maternal Fetal Medicine, Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Bronni Simpson
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Deborah Turnbull
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia
| |
Collapse
|
5
|
Kuah S, Simpson B, Salter A, Matthews G, Louise J, Bednarz J, Chandraharan E, Symonds I, McPhee A, Mol BW, Turnbull D, Wilkinson C. Comparison of effect of CTG + STan with CTG alone on emergency Cesarean section rate: STan Australian Randomized controlled Trial (START). ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2023; 62:462-470. [PMID: 37289946 PMCID: PMC10946943 DOI: 10.1002/uog.26279] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 05/11/2023] [Accepted: 05/24/2023] [Indexed: 06/10/2023]
Abstract
OBJECTIVE To investigate whether use of ST analysis of the fetal electrocardiogram (STan) as an adjunct to continuous cardiotocography (CTG) reduces the rate of emergency Cesarean section (EmCS) compared with CTG alone. METHODS This was a randomized controlled trial of patients with a singleton fetus in cephalic presentation at ≥ 36 weeks' gestation, requiring continuous electronic fetal monitoring during labor at a tertiary maternity hospital in Adelaide, Australia, between January 2018 and July 2021. Participants were randomized to undergo CTG + STan or CTG alone. The calculated sample size was 1818 participants. The primary outcome was EmCS. Secondary outcomes included metabolic acidosis, a composite adverse perinatal outcome, and other maternal and neonatal morbidity and safety outcomes. RESULTS The present study enrolled 970 women, of whom 967 were included in the primary analysis. EmCS occurred in 107/482 (22.2%) deliveries in the CTG + STan arm and in 107/485 (22.1%) in the CTG arm (adjusted relative risk, 1.02 (95% CI, 0.81-1.27); P = 0.89). There was no difference in the rate of adverse maternal or neonatal outcomes between arms. CONCLUSIONS The addition of STan as an adjunct to continuous CTG did not reduce the EmCS rate. The smaller-than-anticipated sample size meant that this study was underpowered to detect absolute differences of ≤ 5% and, therefore, this negative finding could be due to a Type-2 error. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
Collapse
Affiliation(s)
- S. Kuah
- Women's and Children's HospitalNorth AdelaideSAAustralia
| | - B. Simpson
- Women's and Children's HospitalNorth AdelaideSAAustralia
- Women's and Children's Health, Adelaide Medical SchoolUniversity of AdelaideNorth AdelaideSAAustralia
| | - A. Salter
- School of Public Health, Faculty of Health and Medical SciencesUniversity of AdelaideAdelaideSAAustralia
| | - G. Matthews
- Women's and Children's HospitalNorth AdelaideSAAustralia
| | - J. Louise
- Women's and Children's Hospital, Faculty of Health and Medical SciencesUniversity of AdelaideNorth AdelaideSAAustralia
| | - J. Bednarz
- School of Public Health, Faculty of Health and Medical SciencesUniversity of AdelaideAdelaideSAAustralia
- South Australian Health and Medical Research InstituteSAHMRI Women and KidsNorth AdelaideSAAustralia
| | - E. Chandraharan
- Global Academy of Medical Education and Training LtdLondonUK
| | - I. Symonds
- Adelaide Medical School, Faculty of Health and Medical SciencesUniversity of AdelaideAdelaideSAAustralia
| | - A. McPhee
- South Australian Health and Medical Research InstituteSAHMRI Women and KidsNorth AdelaideSAAustralia
| | - B. W. Mol
- Department of Obstetrics and GynaecologyMonash UniversityClaytonVICAustralia
- Aberdeen Centre for Women's Health Research, School of Medicine, Medical Sciences and NutritionUniversity of AberdeenAberdeenUK
| | - D. Turnbull
- School of Psychology, Faculty of Health and Medical SciencesUniversity of AdelaideAdelaideSAAustralia
| | - C. Wilkinson
- Women's and Children's HospitalNorth AdelaideSAAustralia
| |
Collapse
|
6
|
Blix E, Eskild A, Skau I, Grytten J. The impact of the introduction of intrapartum fetal ECG ST segment analysis. A population study. Acta Obstet Gynecol Scand 2022; 101:809-818. [PMID: 35288935 DOI: 10.1111/aogs.14347] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 02/17/2022] [Accepted: 02/25/2022] [Indexed: 11/29/2022]
Abstract
INTRODUCTION ST segment analysis (STAN) of the fetal electrocardiogram was introduced as an adjunct to cardiotocography for intrapartum fetal monitoring 30 years ago. We examined the impact of the introduction of STAN on changes in the occurrence of fetal and neonatal deaths, Apgar scores of <7 at 5 min, intrapartum cesarean sections, and instrumental vaginal deliveries while controlling for time- and hospital-specific trends and maternal risk factors. MATERIAL AND METHODS Data were retrieved from the Medical Birth Registry of Norway from 1985 to 2014. Individual data were linked to the Education Registry and the Central Person Registry. The study sample included 1 132 022 singleton births with a gestational age of 36 weeks or beyond. Information about the year of STAN introduction was collected from every birth unit in Norway using a questionnaire. Our data structure consisted of a hospital-year panel. We applied a linear probability model with hospital-fixed effects and with adjustment for potentially confounding factors. The prevalence of the outcomes before and after the introduction of STAN were compared within each birth unit. RESULTS In total, 23 birth units, representing 76% of all births in Norway, had introduced the STAN technology. During the study period, stillbirths declined from 2.6 to 1.9 per 1000 births, neonatal deaths declined from 1.7 to 0.7 per 1000 live births, babies with Apgar score <7 at 5 min after birth increased from 7.4 to 9.5 per 1000 births, intrapartum cesarean sections increased from 6.4% to 9.5%, and instrumental vaginal deliveries increased from 7.8% to 10.9%. Our analyses found that the introduction of STAN was not associated with the decline in proportion of stillbirths (p =0.76) and neonatal deaths (p =0.76) or with the increase in intrapartum cesarean sections (p =0.92) and instrumental vaginal deliveries (p =0.78). However, it was associated with the increased occurrence of Apgar score <7 at 5 min (p =0.01). CONCLUSIONS There is no evidence that the introduction of STAN contributed to changes in the rates of stillbirths, neonatal deaths, intrapartum cesarean sections, or instrumental vaginal deliveries. There was an association between the introduction of STAN and a small increase in neonates with low Apgar scores.
Collapse
Affiliation(s)
- Ellen Blix
- Faculty of Health Sciences, OsloMet - Oslo Metropolitan University, Oslo, Norway
| | - Anne Eskild
- Akershus University Hospital, Lørenskog, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Irene Skau
- Department of Community Dentistry, University of Oslo, Oslo, Norway
| | - Jostein Grytten
- Department of Community Dentistry, University of Oslo, Oslo, Norway
| |
Collapse
|
7
|
Victor SF, Bach DBB, Hvelplund AC, Nickelsen C, Lyndrup J, Wilken-Jensen C, Scharff LJ, Weber T, Secher NJ, Krebs L. Cardiotocography combined with ST analysis versus cardiotocography combined with fetal blood sampling in deliveries with abnormal CTG: a randomized trial. Arch Gynecol Obstet 2022; 307:1771-1780. [PMID: 35701639 DOI: 10.1007/s00404-022-06649-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 05/25/2022] [Indexed: 11/02/2022]
Abstract
PURPOSE The aim was to investigate if intrapartum monitoring with cardiotocography (CTG) in combination with ST analysis (STAN) results in an improved perinatal outcome. METHODS We performed a two-center randomized trial. 1013 women with term fetuses in cephalic presentation entered the trial. If a CTG showed intermediate or pathological abnormalities, they were offered fetal blood sampling (FBS) and inclusion if the pH value was above 7.25. They were randomized to either CTG + FBS or CTG + STAN. The primary outcome was neonatal metabolic acidosis, defined as umbilical cord arterial blood pH below 7.05, and base excess equal to or below -10. The secondary outcomes included operative vaginal delivery for fetal distress. RESULTS The rate of metabolic acidosis was 0.8% in the CTG + FBS group and 1.5% in women in the CTG + STAN (P = 0.338). More women in the CTG + STAN group delivered by operative vaginal delivery (25.6% vs 33.5%, P = 0.006). Significantly fewer women in the CTG + STAN group had three to five (28.8% vs 11.0%, P = < 0.001) and six to ten fetal blood samples taken (3.4% vs 0.4%, P = < 0.001). CONCLUSION CTG + STAN did not reduce the incidence of neonatal metabolic acidosis compared to CTG + FBS. CTG + STAN was, however, associated with an increased risk of operative vaginal delivery and a reduced use of FBS. If STAN is used for fetal surveillance, we recommend that it is combined with other methods, such as FBS, for confirmation of the need for operative delivery. CLINICALTRIALS gov ID: NCT01699646. Date of registration: October 4, 2012 (retrospectively registered). https://clinicaltrials.gov/ct2/show/NCT01699646?id=NCT01699646&draw=2&rank=1.
Collapse
Affiliation(s)
- Simon Foged Victor
- Department of Obstetrics and Gynecology, Zealand University Hospital, Holbæk, Denmark.
| | - Diana Bøttcher Brøndum Bach
- Department of Gynecology and Obstetrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark
| | - Anna Carolina Hvelplund
- Department of Pediatrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark
| | - Carsten Nickelsen
- Department of Gynecology and Obstetrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark
| | - Jens Lyndrup
- Department of Gynecology and Obstetrics, Zealand University Hospital, Roskilde, Denmark
| | | | - Lise Jul Scharff
- Department of Gynecology and Obstetrics, Zealand University Hospital, Roskilde, Denmark
| | - Tom Weber
- Department of Gynecology and Obstetrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark
| | - Niels Jørgen Secher
- Department of Gynecology and Obstetrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark
| | - Lone Krebs
- Department of Gynecology and Obstetrics, Copenhagen University Hospital, Amager and Hvidovre Hospital, Copenhagen, Denmark.,Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
8
|
Hulsenboom ADJ, Van der Hout-van der Jagt MB, van den Akker ESA, Bakker PCAM, van Beek E, Drogtrop AP, Kwee A, Westerhuis MEMH, Rijnders RJP, Schuitemaker NWE, Willekes C, Vullings R, Oei SG, van Laar JOEH. New possibilities for ST analysis - A post-hoc analysis on the Dutch STAN RCT. Early Hum Dev 2022; 166:105537. [PMID: 35091162 DOI: 10.1016/j.earlhumdev.2021.105537] [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: 03/16/2021] [Revised: 12/17/2021] [Accepted: 12/29/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND The diagnostic value of ST analysis of the fetal electrocardiogram (fECG) during labor is uncertain. False alarms (ST events) may be explained by physiological variation of the fetal electrical heart axis. Adjusted ST events, based on a relative rather than an absolute rise from baseline, correct for this variation and may improve the diagnostic accuracy of ST analysis. AIMS Determine the optimal cut-off for relative ST events in fECG to detect fetal metabolic acidosis. STUDY DESIGN Post-hoc analysis on fECG tracings from the Dutch STAN trial (STAN+CTG branch). SUBJECTS 1328 term singleton fetuses with scalp ECG tracing during labor, including 10 cases of metabolic acidosis. OUTCOME MEASURES Cut-off value for relative ST events at the point closest to (0,1) in the receiver operating characteristic (ROC) curve with corresponding sensitivity and specificity. RESULTS Relative baseline ST events had an optimal cut-off at an increment of 85% from baseline. Relative ST events had a sensitivity of 90% and specificity of 80%. CONCLUSIONS Adjusting the current definition of ST events may improve ST analysis, making it independent of CTG interpretation.
Collapse
Affiliation(s)
- A D J Hulsenboom
- Department of Obstetrics and Gynecology, Máxima Medical Center, P.O. Box 7777, 5500 MB Veldhoven, the Netherlands.
| | - M B Van der Hout-van der Jagt
- Department of Obstetrics and Gynecology, Máxima Medical Center, P.O. Box 7777, 5500 MB Veldhoven, the Netherlands; Faculty of Electrical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, the Netherlands; Faculty of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, the Netherlands
| | - E S A van den Akker
- Department of Obstetrics and Gynecology, Onze Lieve Vrouwe Gasthuis, Oosterpark 9, 1091 AC Amsterdam, the Netherlands
| | - P C A M Bakker
- Department of Obstetrics and Gynecology, Amsterdam University Medical Center, location VUmc, P.O. Box 7057, 1007 MB Amsterdam, the Netherlands
| | - E van Beek
- Department of Obstetrics and Gynecology, St. Antonius Hospital, P.O. Box 2500, 3430 EM Nieuwegein, the Netherlands
| | - A P Drogtrop
- Department of Obstetrics and Gynecology, Elisabeth Tweesteden Hospital, P.O. Box 90151, LC 5000 Tilburg, the Netherlands
| | - A Kwee
- Department of Obstetrics and Gynecology, University Medical Center Utrecht, P.O. Box 85090, 3508 AB Utrecht, the Netherlands
| | - M E M H Westerhuis
- Department of Obstetrics and Gynecology, Catharina Hospital, P.O. Box 1350, ZA 5602 Eindhoven, the Netherlands
| | - R J P Rijnders
- Department of Obstetrics and Gynecology, Jeroen Bosch Hospital, P.O. Box 90153, 5200 ME Hertogenbosch, the Netherlands
| | - N W E Schuitemaker
- Department of Obstetrics and Gynecology, Diakonessenhuis, P.O. Box 80250, 3508 TG Utrecht, the Netherlands
| | - C Willekes
- Department of Obstetrics and Gynecology, Maastricht University Medical Center, P.O. Box 5800, 6202 AZ Maastricht, the Netherlands
| | - R Vullings
- Faculty of Electrical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, the Netherlands
| | - S G Oei
- Department of Obstetrics and Gynecology, Máxima Medical Center, P.O. Box 7777, 5500 MB Veldhoven, the Netherlands; Faculty of Electrical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, the Netherlands
| | - J O E H van Laar
- Department of Obstetrics and Gynecology, Máxima Medical Center, P.O. Box 7777, 5500 MB Veldhoven, the Netherlands
| |
Collapse
|
9
|
Al Wattar BH, Honess E, Bunnewell S, Welton NJ, Quenby S, Khan KS, Zamora J, Thangaratinam S. Effectiveness of intrapartum fetal surveillance to improve maternal and neonatal outcomes: a systematic review and network meta-analysis. CMAJ 2021; 193:E468-E477. [PMID: 33824144 PMCID: PMC8049638 DOI: 10.1503/cmaj.202538] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2021] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND: Cesarean delivery is the most common surgical procedure worldwide. Intrapartum fetal surveillance is routinely offered to improve neonatal outcomes, but the effects of different methods on the risk of emergency cesarean deliveries remains uncertain. We conducted a systematic review and network meta-analysis to evaluate the effectiveness of different types of fetal surveillance. METHODS: We searched MEDLINE, Embase and CENTRAL until June 1, 2020, for randomized trials evaluating any intrapartum fetal surveillance method. We performed a network meta-analysis within a frequentist framework. We assessed the quality and network inconsistency of trials. We reported primarily on intrapartum emergency cesarean deliveries and other secondary maternal and neonatal outcomes using risk ratios (RRs) and 95% confidence intervals (CIs). RESULTS: We included 33 trials (118 863 patients) evaluating intermittent auscultation with Pinard stethoscope/handheld Doppler (IA), cardiotocography (CTG), computerized cardiotocography (cCTG), CTG with fetal scalp lactate (CTG-lactate), CTG with fetal scalp pH analysis (CTG-FBS), CTG with fetal pulse oximetry (FPO-CTG), CTG with fetal heart electrocardiogram (CTG-STAN) and their combinations. Intermittent auscultation reduced the risk of emergency cesarean deliveries compared with other types of surveillance (IA v. CTG: RR 0.83, 95% CI 0.72–0.97; IA v. CTG-FBS: RR 0.71, 95% CI 0.63–0.80; IA v.CTG-lactate: RR 0.77, 95% CI 0.64–0.92; IA v. FPO-CTG: RR 0.75, 95% CI 0.65–0.87; IA v.FPO-CTG-FBS: RR 0.81, 95% CI 0.67–0.99; cCTG-FBS v. IA: RR 1.21, 95% CI 1.04–1.42), except STAN-CTG-FBS (RR 1.17, 95% CI 0.98–1.40). There was a similar reduction observed for emergency cesarean deliveries for fetal distress. None of the evaluated methods was associated with a reduced risk of neonatal acidemia, neonatal unit admissions, Apgar scores or perinatal death. INTERPRETATION: Compared with other types of fetal surveillance, intermittent auscultation seems to reduce emergency cesarean deliveries in labour without increasing adverse neonatal and maternal outcomes.
Collapse
Affiliation(s)
- Bassel H Al Wattar
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Emma Honess
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Sarah Bunnewell
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Nicky J Welton
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Siobhan Quenby
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Khalid S Khan
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Javier Zamora
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| | - Shakila Thangaratinam
- Warwick Medical School (Al Wattar, Honess, Bunnewell, Quenby), University of Warwick, Coventry, UK; Reproductive Medicine Unit (Al Wattar), University College London Hospitals, London, UK; Population Health Sciences (Welton), Bristol Medical School, University of Bristol, Bristol, UK; University Hospital of Coventry and Warwickshire (Quenby), Coventry, UK; Department of Preventive Medicine and Public Health (Khan), University of Granada, Granada, Spain; Clinical Biostatistics Unit, Ramon y Cajal Hospital (IRYCIS) and CIBER Epidemiology and Public Health (Khan, Zamora), Madrid, Spain; CIBER of Epidemiology and Public Health (CIBERESP) (Zamora), Madrid, Spain; WHO Collaborating Centre for Global Women's Health, Institute of Metabolism and Systems Research (Thangaratinam), University of Birmingham; Birmingham Women's and Children's NHS Foundation Trust (Thangaratinam), Birmingham, UK
| |
Collapse
|
10
|
Cagninelli G, Dall'asta A, DI Pasquo E, Morganelli G, Degennaro VA, Fieni S, Frusca T, Ghi T. STAN: a reappraisal of its clinical usefulness. Minerva Obstet Gynecol 2021; 73:34-44. [PMID: 33249820 DOI: 10.23736/s2724-606x.20.04690-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The automatic analysis of fetal ECG in labor has been introduced as an adjunct of traditional cardiotocography with the aim to improve the identification of fetuses with intrapartum hypoxia. Several randomized controlled trials and meta-analyses have produced conflicting results, with the most recent randomized controlled trial not demonstrating any improvement in either neonatal outcomes or reduction in operative birth rates. The objective of this review article is to present the state of art about the use of STAN technology in labor ward.
Collapse
Affiliation(s)
- Greta Cagninelli
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Andrea Dall'asta
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Elvira DI Pasquo
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | | | | | - Stefania Fieni
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Tiziana Frusca
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Tullio Ghi
- Department of Medicine and Surgery, University of Parma, Parma, Italy -
| |
Collapse
|
11
|
Benton M, Salter A, Simpson B, Wilkinson C, Turnbull D. A qualitative study of a sample of women participating in an Australian randomised controlled trial of intrapartum fetal surveillance. Midwifery 2020; 83:102655. [PMID: 32036193 DOI: 10.1016/j.midw.2020.102655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/24/2020] [Accepted: 01/26/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND The STan Australian Randomised controlled Trial (START), the first of its kind in Australia, compares two techniques of intrapartum fetal surveillance (cardiotocographic electronic fetal monitoring (CTG) plus analysis of the ST segment of the fetal electrocardiogram (STan+CTG) with CTG alone) with the aim of reducing unnecessary obstetric intervention. It is also the first comprehensive intrapartum fetal surveillance (IFS) trial worldwide, including qualitative examination of psychosocial outcomes and cost-effectiveness. In evaluating and implementing healthcare interventions, the perspectives and experiences of individuals directly receiving them is an integral part of a comprehensive assessment. Furthermore, the added value of using qualitative research alongside randomised controlled trials (RCTs) is becoming widely acknowledged. OBJECTIVE This study aimed to examine women's experiences with the type of IFS they received in the START trial. METHODS Using a qualitative research design, a sample of thirty-two women were interviewed about their experiences with the fetal monitoring they received. Data were analysed using thematic analysis. FINDINGS Six themes emerged from analysis: reassurance, mobility, discomfort, perception of the fetal Scalp Electrode (FSE), and overall positive experience. CONCLUSION Interestingly, it was found that women who had an FSE in the CTG alone arm of the trial reported very similar experiences to women in the STan+CTG arm of the trial. Despite STan and CTG differing clinically, from women's perspectives, the primary difference between the two techniques was the utilisation (or not) of the FSE. Women were very accepting of STan+CTG as it was perceived and experienced as a more accurate form of monitoring than CTG alone. Findings from this study have significant implications for health professionals including midwives and obstetricians and implications for standard practice and care. The study has demonstrated the importance and significance of incorporating qualitative enquiry within RCTs.
Collapse
Affiliation(s)
- Madeleine Benton
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia.
| | - Amy Salter
- School of Public Health, University of Adelaide, Adelaide, South Australia, Australia
| | - Bronni Simpson
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Chris Wilkinson
- Maternal Fetal Medicine, Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - Deborah Turnbull
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia
| |
Collapse
|
12
|
Amer-Wåhlin I, Ugwumadu A, Yli BM, Kwee A, Timonen S, Cole V, Ayres-de-Campos D, Roth GE, Schwarz C, Ramenghi LA, Todros T, Ehlinger V, Vayssiere C. Fetal electrocardiography ST-segment analysis for intrapartum monitoring: a critical appraisal of conflicting evidence and a way forward. Am J Obstet Gynecol 2019; 221:577-601.e11. [PMID: 30980794 DOI: 10.1016/j.ajog.2019.04.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 03/31/2019] [Accepted: 04/01/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND In the past century, some areas of obstetric including intrapartum care have been slow to benefit from the dramatic advances in technology and medical care. Although fetal heart rate monitoring (cardiotocography) became available a half century ago, its interpretation often differs between institutions and countries, its diagnostic accuracy needs improvement, and a technology to help reduce the unnecessary obstetric interventions that have accompanied the cardiotocography is urgently needed. STUDY DESIGN During the second half of the 20th century, key findings in animal experiments captured the close relationship between myocardial glycogenolysis, myocardial workload, and ST changes, thus demonstrating that ST waveform analysis of the fetal electrocardiogram can provide information on oxygenation of the fetal myocardium and establishing the physiological basis for the use of electrocardiogram in intrapartum fetal surveillance. RESULTS Six randomized controlled trials, 10 meta-analyses, and more than 20 observational studies have evaluated the technology developed based on this principle. Nonetheless, despite this intensive assessment, differences in study protocols, inclusion criteria, enrollment rates, clinical guidelines, use of fetal blood sampling, and definitions of key outcome parameters, as well as inconsistencies in randomized controlled trial data handling and statistical methodology, have made this voluminous evidence difficult to interpret. Enormous resources spent on randomized controlled trials have failed to guarantee the generalizability of their results to other settings or their ability to reflect everyday clinical practice. CONCLUSION The latest meta-analysis used revised data from primary randomized controlled trials and data from the largest randomized controlled trials from the United States to demonstrate a significant reduction of metabolic acidosis rates by 36% (odds ratio, 0.64; 95% confidence interval, 0.46-0.88) and operative vaginal delivery rates by 8% (relative risk, 0.92; 95% confidence interval, 0.86-0.99), compared with cardiotocography alone.
Collapse
|
13
|
Liston R, Sawchuck D, Young D. No. 197b-Fetal Health Surveillance: Intrapartum Consensus Guideline. JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA 2019; 40:e298-e322. [PMID: 29680084 DOI: 10.1016/j.jogc.2018.02.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE This guideline provides new recommendations pertaining to the application and documentation of fetal surveillance in the intrapartum period that will decrease the incidence of birth asphyxia while maintaining the lowest possible rate of obstetrical intervention. Pregnancies with and without risk factors for adverse perinatal outcomes are considered. This guideline presents an alternative classification system for antenatal fetal non-stress testing and intrapartum electronic fetal surveillance to what has been used previously. This guideline is intended for use by all health professionals who provide intrapartum care in Canada. OPTIONS Consideration has been given to all methods of fetal surveillance currently available in Canada. OUTCOMES Short- and long-term outcomes that may indicate the presence of birth asphyxia were considered. The associated rates of operative and other labour interventions were also considered. EVIDENCE A comprehensive review of randomized controlled trials published between January 1996 and March 2007 was undertaken, and MEDLINE and the Cochrane Database were used to search the literature for all new studies on fetal surveillance antepartum. The level of evidence has been determined using the criteria and classifications of the Canadian Task Force on Preventive Health Care (Table 1). SPONSOR This consensus guideline was jointly developed by the Society of Obstetricians and Gynaecologists of Canada and the British Columbia Perinatal Health Program (formerly the British Columbia Reproductive Care Program or BCRCP) and was partly supported by an unrestricted educational grant from the British Columbia Perinatal Health Program. RECOMMENDATION 1: LABOUR SUPPORT DURING ACTIVE LABOUR: RECOMMENDATION 2: PROFESSIONAL ONE-TO ONE CARE AND INTRAPARTUM FETAL SURVEILLANCE: RECOMMENDATION 3: INTERMITTENT AUSCULTATION IN LABOUR: RECOMMENDATION 4: ADMISSION FETAL HEART TEST: RECOMMENDATION 5: INTRAPARTUM FETAL SURVEILLANCE FOR WOMEN WITH RISK FACTORS FOR ADVERSE PERINATAL OUTCOME: When a normal tracing is identified, it may be appropriate to interrupt the electronic fetal monitoring tracing for up to 30 minutes to facilitate periods of ambulation, bathing, or position change, providing that (1) the maternal-fetal condition is stable and (2) if oxytocin is being administered, the infusion rate is not increased (III-B). RECOMMENDATION 6: DIGITAL FETAL SCALP STIMULATION: RECOMMENDATION 7: FETAL SCALP BLOOD SAMPLING: RECOMMENDATION 8: UMBILICAL CORD BLOOD GASES: RECOMMENDATION 9: FETAL PULSE OXIMETRY: RECOMMENDATION 10: ST WAVEFORM ANALYSIS: RECOMMENDATION 11: INTRAPARTUM FETAL SCALP LACTATE TESTING.
Collapse
|
14
|
Liston R, Sawchuck D, Young D. N° 197b-Surveillance du bien-être fœtal : Directive consensus d'intrapartum. JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA 2019; 40:e323-e352. [PMID: 29680085 DOI: 10.1016/j.jogc.2018.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
15
|
Turnbull D, Salter A, Simpson B, Mol BW, Chandraharan E, McPhee A, Symonds I, Benton M, Kuah S, Matthews G, Howard K, Wilkinson C. Comparing the effect of STan (cardiotocographic electronic fetal monitoring (CTG) plus analysis of the ST segment of the fetal electrocardiogram) with CTG alone on emergency caesarean section rates: study protocol for the STan Australian Randomised controlled Trial (START). Trials 2019; 20:539. [PMID: 31464638 PMCID: PMC6716809 DOI: 10.1186/s13063-019-3640-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Accepted: 08/08/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Cardiotocography is almost ubiquitous in its use in intrapartum care. Although it has been demonstrated that there is some benefit from continuous intrapartum fetal monitoring using cardiotocography, there is also an increased risk of caesarean section which is accompanied by short-term and long-term risks to the mother and child. There is considerable potential to reduce unnecessary operative delivery with up to a 60% false positive diagnosis of fetal distress using cardiotocography alone. ST analysis of the fetal electrocardiogram is a promising adjunct to cardiotocography alone, and permits detection of metabolic acidosis of the fetus, potentially reducing false positive diagnosis of fetal distress. METHODS This study will be a single-centre, parallel-group, randomised controlled trial, conducted over 3 years. The primary hypothesis will be that the proportion of women with an emergency caesarean section on ST analysis will not equal that for women on cardiotocography monitoring alone. Participants will be recruited at the Women's and Children's Hospital, a high-risk specialty facility with approximately 5000 deliveries per annum. A total of 1818 women will be randomised to the treatment or conventional arm with an allocation ratio of 1:1, stratified by parity. The primary outcome is emergency caesarean section (yes/no). Statistical analysis will follow standard methods for randomised trials and will be performed on an intention-to-treat basis. Secondary maternal and neonatal outcomes will also be analysed. Additional study outcomes include psychosocial outcomes, patient preferences and cost-effectiveness. DISCUSSION Approximately 20% of Australian babies are delivered by emergency caesarean section. This will be the first Australian trial to examine ST analysis of the fetal electrocardiogram as an adjunct to cardiotocography as a potential method for reducing this proportion. The trial will be among the first to comprehensively examine ST analysis, taking into account the impact on psychosocial well-being as well as cost-effectiveness. This research will provide Australian evidence for clinical practice and guideline development as well as for policy-makers and consumers to make informed, evidence-based choices about care in labour. TRIAL REGISTRATION ANZCTR, ACTRN1261800006268 . Registered on 19 January 2018.
Collapse
Affiliation(s)
- D Turnbull
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia
| | - A Salter
- School of Public Health, University of Adelaide, Adelaide, South Australia, Australia
| | - B Simpson
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - B W Mol
- Department of Obstetrics and Gynaecology, Monash University, Melbourne, Victoria, Australia
| | - E Chandraharan
- NHS Foundation Trust, St George's University Hospitals, London, UK
| | - A McPhee
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - I Symonds
- Adelaide Medical School, University of Adelaide, Adelaide, South Australia, Australia
| | - M Benton
- School of Psychology, University of Adelaide, Adelaide, South Australia, Australia
| | - S Kuah
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - G Matthews
- Women's and Children's Hospital, Adelaide, South Australia, Australia
| | - K Howard
- School of Public Health, The University of Sydney, Sydney, New South Wales, Australia
| | - C Wilkinson
- Women's and Children's Hospital, Adelaide, South Australia, Australia.
| |
Collapse
|
16
|
Significant reduction in umbilical artery metabolic acidosis after implementation of intrapartum ST waveform analysis of the fetal electrocardiogram. Am J Obstet Gynecol 2019; 221:63.e1-63.e13. [PMID: 30826340 DOI: 10.1016/j.ajog.2019.02.049] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 01/17/2019] [Accepted: 02/22/2019] [Indexed: 11/24/2022]
Abstract
BACKGROUND Although the evidence regarding the benefit of using ST waveform analysis of the fetal electrocardiogram is conflicting, ST waveform analysis is considered as adjunct to identify fetuses at risk for asphyxia in our center. Most randomized controlled trials and meta-analyses have not shown a significant decrease in umbilical metabolic acidosis, while some observational studies have shown a gradual decrease of this outcome over a longer period of time. Observational studies can give more insight into the effect of implementation of the ST technology in daily clinical practice. OBJECTIVE To evaluate the change in frequency of perinatal intervention and adverse neonatal outcome after the implementation of ST waveform analysis of the fetal electrocardiogram from 2000 to 2013. STUDY DESIGN This retrospective longitudinal study was conducted in a tertiary referral center. A total of 19,664 medium- and high-risk singleton pregnancies with fetuses in cephalic presentation, a gestational age of ≥36 weeks, and the intention to deliver vaginally were included. ST waveform analysis of the fetal electrocardiogram was implemented in the year 2000 and by 2010 all deliveries were monitored using this technology. Data were collected on the following perinatal outcomes: fetal blood sampling, mode of delivery, umbilical cord blood gases, Apgar scores, neonatal encephalopathy, and perinatal death. Longitudinal trend analysis was used to detect changes over time in all deliveries monitored by cardiotocography either alone or in adjunct to ST waveform analysis of the fetal electrocardiogram. Logistic regression was used to correct for possible confounders. RESULTS The umbilical artery metabolic acidosis rate declined from 2.5% (average rate of 2000 + 2001 + 2002) to 0.4% (average of 2011 + 2012 + 2013) (P < .001), which represents an 84% decrease. This decrease largely occurred between 2006 and 2008, during the Dutch randomized trial on fetal electrocardiogram ST waveform analysis. At this time, approximately 20% of deliveries were monitored using this method. Furthermore, there were significant reductions in fetal blood sampling rate (P < .001). Overall cesarean and vaginal instrumental deliveries decreased significantly (P < .001), but not for fetal distress. There were no changes in the Apgar scores. The incidence of neonatal encephalopathy was significantly lower in the second part of the study (odds ratio 0.39, 95% confidence interval 0.17-0.89). CONCLUSION There was an 84% decrease in the incidence of umbilical artery metabolic acidosis in all deliveries between 2000 and 2013. The neonatal encephalopathy rate, fetal blood sampling rate, and the total number of cesarean and vaginal instrumental deliveries also decreased.
Collapse
|
17
|
Hulsenboom ADJ, Verdurmen KMJ, Vullings R, van der Hout–van der Jagt MB, Kwee A, van Laar JOEH, Oei SG. Relative versus absolute rises in T/QRS ratio by ST analysis of fetal electrocardiograms in labour: A case-control pilot study. PLoS One 2019; 14:e0214357. [PMID: 30913253 PMCID: PMC6435156 DOI: 10.1371/journal.pone.0214357] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 03/12/2019] [Indexed: 11/18/2022] Open
Abstract
Introduction The additional value of ST analysis during labour is uncertain. In ST analysis, a T/QRS baseline value is calculated from the fetal electrocardiogram and successive T/QRS ratios are compared to this baseline. However, variation in the orientation of the electrical heart axis between fetuses may yield different T/QRS baseline values. In case of a higher T/QRS baseline value more ST events are encountered, although not always related to perinatal outcome. We hypothesised that we can partly correct for this effect by analysing T/QRS rises as a percentage from baseline (relative ST analysis). This study aimed to explore whether relative ST analysis has better diagnostic value for cord acidaemia compared to conventional ST analysis, where predefined fixed T/QRS ratios are used. Methods and materials A case-control study was performed in 20 term human fetuses during labour; 10 cases (umbilical cord artery pH <7.05 at birth, defining acidaemia) and 10 controls (pH >7.20) were included. The fetal electrocardiogram was recorded using a STAN monitor. We electronically extracted all T/QRS values, baseline and episodic ST events from the STAN monitor and calculated the relative T/QRS changes. The cut-off for relative ST events was determined in a receiver operator characteristic (ROC) curve at optimal specificity for cord acidaemia. Parameters of interest were area under the curve (AUC) of the ROC curve for relative ST events and test performance of both conventional and relative ST analysis. Results Relative ST analysis showed an AUC of 0.99. The optimal cut-off value for relative T/QRS rise was determined at 0.70. Relative vs conventional (absolute) ST analysis showed a specificity of 100% vs 40% (p = 0.031); sensitivity 90% vs 90%; positive likelihood ratio infinity vs 1.5; negative likelihood ratio 0.10 vs 0.25, respectively. Conclusion Relative ST analysis seems to be a promising method to detect impending fetal acidaemia during labour. Further studies are required to determine the diagnostic accuracy.
Collapse
Affiliation(s)
| | - Kim M. J. Verdurmen
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
| | - Rik Vullings
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | | | - Anneke Kwee
- Department of Obstetrics and Gynaecology, University Medical Centre Utrecht, Utrecht, the Netherlands
| | | | - S. Guid Oei
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| |
Collapse
|
18
|
Puertas A, Góngora J, Valverde M, Revelles L, Manzanares S, Carrillo MP. Cardiotocography alone vs. cardiotocography with ST segment analysis for intrapartum fetal monitoring in women with late-term pregnancy. A randomized controlled trial. Eur J Obstet Gynecol Reprod Biol 2019; 234:213-217. [PMID: 30731334 DOI: 10.1016/j.ejogrb.2019.01.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 01/17/2019] [Accepted: 01/18/2019] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Randomized studies have obtained conflicting results regarding the usefulness of fetal electrocardiographic (ECG) ST-segment analysis, possibly because these studies included non-homogeneous populations. We designed a study to determine whether this monitoring technique is potentially useful for populations at risk for fetal heart rate alterations during labor, i.e. groups of women who share late-term pregnancy as a risk factor. STUDY DESIGN This randomized clinical trial recruited women whose pregnancy had lasted more than 290 days. The participants were randomly assigned to continuous fetal cardiotocographic monitoring alone (CTG group) or with fetal ECG ST-segment analysis (ECG-F group). In the CTG group fetal heart rate was interpreted according to guidelines from the National Institute of Child Health and Human Development, whereas in the ECG-F group the tracings were interpreted according the original International Federation of Gynecology and Obstetrics (FIGO) guidelines. The primary outcome measure was neonatal outcome, evaluated as arterial blood pH in neonates after abdominal or vaginal operative delivery indicated because of nonreassuring fetal status. RESULTS A total of 237 women were randomized, of whom 200 were included in the final analysis (100 in each group). The rate of cesarean delivery was the same in both groups (26%), and the rate of operative delivery due to nonreassuring fetal status did not differ significantly (38% in the CTG group vs. 39% in the ECG-F group). Regarding neonatal outcomes, there was no significant difference between groups in neonatal pH (7.27 [7.23-7.29] and 7.25 [7.21-7.27]). CONCLUSIONS In a population comprising only late-term pregnancies, fetal ECG monitoring had no benefits for the mother or fetus. Additional studies are needed of protocols for using ST waveform analysis in selected population groups.
Collapse
Affiliation(s)
- Alberto Puertas
- Department of Obstetrics and Gynecology, Virgen de las Nieves University Hospital of Granada, Avda. Fuerzas Armadas s/n, 18014 Granada, Spain.
| | - Javier Góngora
- Department of Obstetrics and Gynecology, Hospital de Poniente, Almería, Spain
| | - Mercedes Valverde
- Department of Obstetrics and Gynecology, Hospital "Santa Ana", Motril, Spain
| | - Laura Revelles
- Department of Obstetrics and Gynecology, Virgen de las Nieves University Hospital of Granada, Avda. Fuerzas Armadas s/n, 18014 Granada, Spain
| | - Sebastian Manzanares
- Department of Obstetrics and Gynecology, Virgen de las Nieves University Hospital of Granada, Avda. Fuerzas Armadas s/n, 18014 Granada, Spain
| | - M Paz Carrillo
- Department of Obstetrics and Gynecology, Virgen de las Nieves University Hospital of Granada, Avda. Fuerzas Armadas s/n, 18014 Granada, Spain
| |
Collapse
|
19
|
Cummins G, Kremer J, Bernassau A, Brown A, Bridle HL, Schulze H, Bachmann TT, Crichton M, Denison FC, Desmulliez MPY. Sensors for Fetal Hypoxia and Metabolic Acidosis: A Review. SENSORS (BASEL, SWITZERLAND) 2018; 18:E2648. [PMID: 30104478 PMCID: PMC6111374 DOI: 10.3390/s18082648] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 07/30/2018] [Accepted: 08/02/2018] [Indexed: 12/11/2022]
Abstract
This article reviews existing clinical practices and sensor research undertaken to monitor fetal well-being during labour. Current clinical practices that include fetal heart rate monitoring and fetal scalp blood sampling are shown to be either inadequate or time-consuming. Monitoring of lactate in blood is identified as a potential alternative for intrapartum fetal monitoring due to its ability to distinguish between different types of acidosis. A literature review from a medical and technical perspective is presented to identify the current advancements in the field of lactate sensors for this application. It is concluded that a less invasive and a more continuous monitoring device is required to fulfill the clinical needs of intrapartum fetal monitoring. Potential specifications for such a system are also presented in this paper.
Collapse
Affiliation(s)
- Gerard Cummins
- Institute of Sensors, Signals and Systems, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| | - Jessica Kremer
- Institute of Sensors, Signals and Systems, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| | - Anne Bernassau
- Institute of Sensors, Signals and Systems, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| | - Andrew Brown
- MRC Centre for Reproductive Health, Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, Scotland, UK.
| | - Helen L Bridle
- Institute of Sensors, Signals and Systems, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| | - Holger Schulze
- Division of Infection and Pathway Medicine, Edinburgh Medical School, The Chancellor's Building, The University of Edinburgh, Edinburgh EH16 4SB, Scotland, UK.
| | - Till T Bachmann
- Division of Infection and Pathway Medicine, Edinburgh Medical School, The Chancellor's Building, The University of Edinburgh, Edinburgh EH16 4SB, Scotland, UK.
| | - Michael Crichton
- Institute of Mechanical, Processing and Energy Engineering, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| | - Fiona C Denison
- MRC Centre for Reproductive Health, Queen's Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, Scotland, UK.
| | - Marc P Y Desmulliez
- Institute of Sensors, Signals and Systems, Heriot-Watt University, Riccarton EH14 4AS, Scotland, UK.
| |
Collapse
|
20
|
Timonen S, Holmberg K. The importance of the learning process in ST analysis interpretation and its impact in improving clinical and neonatal outcomes. Am J Obstet Gynecol 2018; 218:620.e1-620.e7. [PMID: 29577914 DOI: 10.1016/j.ajog.2018.03.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 03/06/2018] [Accepted: 03/16/2018] [Indexed: 11/24/2022]
Abstract
BACKGROUND Intrapartum fetal heart rate monitoring was introduced with the goal to reduce fetal hypoxia and deaths. However, continuous fetal heart rate monitoring has been shown to have a high sensitivity but also a high false-positive rate. To improve specificity, adjunctive technologies have been developed to identify fetuses at risk for intrapartum asphyxia. Intensive research on the value of ST-segment analysis of the fetal electrocardiogram as an adjunct to standard electronic fetal monitoring in lowering the rates of fetal metabolic acidosis and operative deliveries has been ongoing. The conflicting results in randomized and observational studies may partly be due to differences in study design. OBJECTIVE This study aims to determine the significance of the learning process for the introduction of ST analysis into clinical practice and its impact on initial and subsequent obstetric outcomes. STUDY DESIGN This was a prospective observational study with the primary objective to evaluate the importance of the learning period on the rates of metabolic acidosis and operative deliveries after the implementation of ST analysis. The study was conducted at the Turku University Hospital, Turku, Finland, with 3400-4200 annual deliveries. The whole study population consisted of all 42,146 deliveries during the study period 2001 through 2011. The ST analysis usage rate was 18%. The data were collected prospectively from labors monitored with ST analysis as an adjunct to conventional intrapartum fetal heart rate monitoring. Primary endpoints were the rates of metabolic acidosis (cord artery pH <7.05 and an extracellular fluid compartment base deficit >12.0 mmol/L), fetal scalp blood sampling, and operative deliveries. Comparisons of these outcomes were made between the initiation period (the first 2 years) and the subsequent usage period (the next 9 years). RESULTS In the whole study population the prevalence of cord pH <7.05 decreased from 1.5-0.81% (relative risk, 0.54; 95% confidence interval, 0.43-0.67), the rate of cesarean deliveries from 17.2-14.1% (relative risk, 0.82; 95% confidence interval, 0.89-0.97), and the rate of fetal scalp blood sampling from 1.75-0.82% (relative risk, 0.47; 95% confidence interval, 0.38-0.58) when the 2 study periods were compared. In the ST analysis group, the frequency of cord metabolic acidosis rate was reduced from 1.0-0.25% (relative risk, 0.33; 95% confidence interval, 0.15-0.72). CONCLUSION We provide evidence that the results improve over time and there is a learning curve in the introduction of the ST analysis method. This was demonstrated by the lower rates of metabolic acidosis and operative deliveries after the initial implementation period.
Collapse
|
21
|
Vullings R, Verdurmen KMJ, Hulsenboom ADJ, Scheffer S, de Lau H, Kwee A, Wijn PFF, Amer-Wåhlin I, van Laar JOEH, Oei SG. The electrical heart axis and ST events in fetal monitoring: A post-hoc analysis following a multicentre randomised controlled trial. PLoS One 2017; 12:e0175823. [PMID: 28410419 PMCID: PMC5391944 DOI: 10.1371/journal.pone.0175823] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Accepted: 03/27/2017] [Indexed: 01/12/2023] Open
Abstract
Objective Reducing perinatal morbidity and mortality is one of the major challenges in modern health care. Analysing the ST segment of the fetal electrocardiogram was thought to be the breakthrough in fetal monitoring during labour. However, its implementation in clinical practice yields many false alarms and ST monitoring is highly dependent on cardiotocogram assessment, limiting its value for the prediction of fetal distress during labour. This study aims to evaluate the relation between physiological variations in the orientation of the fetal electrical heart axis and the occurrence of ST events. Methods A post-hoc analysis was performed following a multicentre randomised controlled trial, including 1097 patients from two participating centres. All women were monitored with ST analysis during labour. Cases of fetal metabolic acidosis, poor signal quality, missing blood gas analysis, and congenital heart disease were excluded. The orientation of the fetal electrical heart axis affects the height of the initial T/QRS baseline, and therefore the incidence of ST events. We grouped tracings with the same initial baseline T/QRS value. We depicted the number of ST events as a function of the initial baseline T/QRS value with a linear regression model. Results A significant increment of ST events was observed with increasing height of the initial T/QRS baseline, irrespective of the fetal condition; correlation coefficient 0.63, p<0.001. The most frequent T/QRS baseline is 0.12. Conclusion The orientation of the fetal electrical heart axis and accordingly the height of the initial T/QRS baseline should be taken into account in fetal monitoring with ST analysis.
Collapse
Affiliation(s)
- Rik Vullings
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Kim M. J. Verdurmen
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
- * E-mail:
| | | | - Stephanie Scheffer
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
| | - Hinke de Lau
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
| | - Anneke Kwee
- Department of Obstetrics and Gynaecology, University Medical Centre Utrecht, Utrecht, the Netherlands
| | - Pieter F. F. Wijn
- Department of Clinical Physics, Máxima Medical Centre, Veldhoven, the Netherlands
| | - Isis Amer-Wåhlin
- Department of Women and Child Health, Karolinska Institute, Stockholm, Sweden
| | | | - S. Guid Oei
- Department of Electrical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands
- Department of Obstetrics and Gynaecology, Máxima Medical Centre, Veldhoven, the Netherlands
| |
Collapse
|
22
|
Chandraharan E. Foetal electrocardiograph (ST-analyser or STAN) for intrapartum foetal heart rate monitoring: a friend or a foe? J Matern Fetal Neonatal Med 2017; 31:123-127. [DOI: 10.1080/14767058.2016.1276559] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Edwin Chandraharan
- Labour Ward Lead Consultant and Lead for Clinical Governance, St. George’s University Hospitals NHS Foundation Trust, St George’s University of London, London, UK
| |
Collapse
|
23
|
Xodo S, Saccone G, Schuit E, Amer-Wåhlin I, Berghella V. Why STAN might not be dead. J Matern Fetal Neonatal Med 2016; 30:2306-2308. [DOI: 10.1080/14767058.2016.1247263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Serena Xodo
- Department of Gynecology and Obstetrics, School of Medicine, University of Udine, Udine, Italy,
| | - Gabriele Saccone
- Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples Federico II, Naples, Italy,
| | - Ewoud Schuit
- Department of Medicine, Stanford Prevention Research Center, Stanford University, Stanford, CA, USA,
| | - Isis Amer-Wåhlin
- Department of Learning Informatics Management and Ethics and Department of Women and Child Health, Medical Management Center, Karolinska Institute, Stockholm, Sweden, and
| | - Vincenzo Berghella
- Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Sidney Kimmel Medical College of Thomas Jefferson University, Philadelphia, PA, USA
| |
Collapse
|
24
|
Vejux N, Ledu R, D’ercole C, Piechon L, Loundou A, Bretelle F. Guideline choice for CTG analysis influences first caesarean decision. J Matern Fetal Neonatal Med 2016; 30:1816-1819. [DOI: 10.1080/14767058.2016.1228050] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Nadege Vejux
- Department of Gynaecology and Obstetrics, GYNEPOLE, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France,
| | - Renaud Ledu
- Department of Gynaecology and Obstetrics, GYNEPOLE, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France,
| | - Claude D’ercole
- Department of Gynaecology and Obstetrics, GYNEPOLE, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France,
- Department of Public Health, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France, and
| | - Laurence Piechon
- Department of Gynaecology and Obstetrics, GYNEPOLE, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France,
| | - Anderson Loundou
- Department of Public Health, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France, and
| | - Florence Bretelle
- Department of Gynaecology and Obstetrics, GYNEPOLE, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix Marseille Université, AMU, Marseille, France,
- Faculté de Médecine de Marseille, UMR CNRS-IRD 6236, Université de la Méditerranée, Marseille, France
| |
Collapse
|
25
|
Straface G, Scambia G, Zanardo V. Does ST analysis of fetal ECG reduce cesarean section rate for fetal distress? J Matern Fetal Neonatal Med 2016; 30:1799-1802. [DOI: 10.1080/14767058.2016.1226794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Gianluca Straface
- Division of Perinatal Medicine, Policlinico Abano Terme, Abano Terme, Padua, Italy and
| | - Giovanni Scambia
- Department of Obstetrics and Gynecology, Catholic University of the Sacred Heart, Rome, Italy
| | - Vincenzo Zanardo
- Division of Perinatal Medicine, Policlinico Abano Terme, Abano Terme, Padua, Italy and
| |
Collapse
|
26
|
Bloom SL, Belfort M, Saade G. What we have learned about intrapartum fetal monitoring trials in the MFMU Network. Semin Perinatol 2016; 40:307-17. [PMID: 27140936 PMCID: PMC4983203 DOI: 10.1053/j.semperi.2016.03.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The vast majority of pregnant women are subjected to electronic fetal heart monitoring during labor. There is limited evidence to support its benefit compared with intermittent auscultation. In addition, there is significant variability in interpretation and its false-positive rate is high. The latter may have contributed to the rise in operative deliveries. In order to address the critical need for better approaches to intrapartum monitoring, the MFMU Network has completed two large multisite randomized trials, one to evaluate fetal pulse oximetry and the other to evaluate fetal ECG ST segment analysis (STAN). Both of these technologies had been approved for clinical use in the United States based on prior smaller trials. These technologies were evaluated in laboring women near term and their primary outcomes were overall cesarean delivery for the oximetry trial and a composite adverse neonatal outcome for STAN. Both the trials failed to show a benefit of the technology, neither in the rates of operative deliveries nor in the rates of adverse neonatal outcomes. The experience with these trials, summarized in this report, highlights the need for rigorous evidence before introduction of new technology into clinical practice and provides a blueprint for future trials to address the need for better intrapartum monitoring approaches.
Collapse
Affiliation(s)
- Steven L. Bloom
- Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390
| | - Michael Belfort
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Texas Children’s Hospital Pavilion for Women, 6651 Main Street, Houston, TX 77030
| | - George Saade
- Department of Obstetrics and Gynecology, The University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555
| | | |
Collapse
|
27
|
Cuneo BF, Strasburger JF, Wakai RT. The natural history of fetal long QT syndrome. J Electrocardiol 2016; 49:807-813. [PMID: 27539165 DOI: 10.1016/j.jelectrocard.2016.07.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Indexed: 01/13/2023]
Abstract
INTRODUCTION Fetal magnetocardiography (fMCG), the magnetic analog of ECG, has provided invaluable insight into the mechanisms of fetal arrhythmias. In the past 15years, we have evaluated over 300 fetuses with arrhythmia by fMCG. We review the unique characteristics and natural history of the long QT syndrome (LQTS) rhythms. METHODS We reviewed the fMCGs of subjects referred with suspected LQTS based on either a positive family history or echo diagnosis of the LQTS rhythms (sinus bradycardia, ventricular tachycardia, or 2:1 AV conduction) to the Biomagnetism laboratory in the Department of Medical Physics, UW-Madison. We recorded fMCGs using a 37-channel (Magnes, 4D Neuroimaging, Inc., San Diego, CA) superconducting quantum interference device (SQUID) biomagnetometer, housed in a magnetically-shielded room for 1200-6000s. Signal processing was used to remove maternal interference. Cardiac intervals (R-R, p, QRS, QT) were measured and compared to published normals. We correlated fetal heart rate (FHR) patterns and effects of fetal movement on FHR and rhythm using actocardiography. RESULTS Thirty-nine fetuses were studied at a mean of 28 (19-38) weeks of gestation. All had structurally normal hearts. One was on amiodarone for suspected supraventricular tachycardia and hydrops. Five had serial fMCGs. Isolated sinus bradycardia with a QTc >490ms was found in 35: 33 had a KCNQ1 mutation There was one false positive and one false negative LQTS diagnosis. Four fetuses had torsades de pointes (TdP) and 3 had periods of 2:1 conduction and either KCNH2 or SCN5A mutations. TdP was rarely initiated with a preceding long-short pattern and did not degenerate into ventricular fibrillation. One fetus with TdP died in utero, 2 with fetal TdP had postnatal cardiac arrest. CONCLUSION Fetal LQTS is diagnosed by an fMCG QTc >490ms with an 89% sensitivity and specificity. TdP are seen with uncharacterized, KCNH2 or SCN5A R1623q mutations. Fetal TdP occurs when QTc ≥620ms. Identifying fetal LQTS and defining its rhythms by fMCG risk stratifies postnatal management.
Collapse
Affiliation(s)
- Bettina F Cuneo
- Children's Hospital Colorado, Department of Pediatrics, Heart Institute, University of Colorado School of Medicine, Aurora, CO.
| | - Janette F Strasburger
- Children's Hospital of Wisconsin Department of Pediatrics, Section of Cardiology, the Medical College of Wisconsin, Milwaukee, WI
| | - Ronald T Wakai
- The Biomagnetism Laboratory, Department of Medical Physics, University of Wisconsin, Madison, WI
| |
Collapse
|
28
|
Visser GH, Ayres-de-Campos D. FIGO consensus guidelines on intrapartum fetal monitoring: Adjunctive technologies. Int J Gynaecol Obstet 2016; 131:25-9. [PMID: 26433402 DOI: 10.1016/j.ijgo.2015.06.021] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Gerard H Visser
- Department of Obstetrics, University Medical Center, Utrecht, The Netherlands
| | - Diogo Ayres-de-Campos
- Medical School, Institute of Biomedical Engineering, S. Joao Hospital, University of Porto, Portugal
| | | |
Collapse
|
29
|
Electrocardiogram ST Analysis During Labor: A Systematic Review and Meta-analysis of Randomized Controlled Trials. Obstet Gynecol 2016; 127:127-135. [PMID: 26646135 DOI: 10.1097/aog.0000000000001198] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To compare the effectiveness of cardiotocography plus ST analysis with cardiotocography alone during labor. DATA SOURCES Randomized controlled trials were identified by searching electronic databases. METHODS OF STUDY SELECTION We included all randomized controlled trials comparing intrapartum fetal monitoring with cardiotocography plus ST analysis with cardiotocography alone. The primary outcome (ie, perinatal composite outcome) was a composite of intrapartum fetal death, neonatal death, Apgar score 3 or less at 5 minutes, neonatal seizure, metabolic acidosis (defined as umbilical arterial pH 7.05 or less, and extracellular fluid base deficit 12 mmol/L or greater), intubation for ventilation at delivery, or neonatal encephalopathy. TABULATION, INTEGRATION, AND RESULTS Six randomized controlled trials, which included 26,529 laboring singletons with cephalic presentation at term, were analyzed. Compared with women who were randomized to cardiotocography, those who were randomized to ST analysis and cardiotocography had a similar incidence of perinatal composite outcome (1.5% compared with 1.6%; relative risk [RR] 0.90, 95% confidence interval [CI] 0.74-1.10; five studies), neonatal metabolic acidosis (0.5% compared with 0.7%; RR 0.74, 95% CI 0.54-1.02; five studies), admission to the neonatal intensive care unit (5.4% compared with 5.5%; RR 0.99, 95% CI 0.90-1.10; six studies), perinatal death (0.1% compared with 0.1%; RR 1.71, 95% CI 0.67-4.33; six studies), neonatal encephalopathy (0.1% compared with 0.2%; RR 0.62, 95% CI 0.25-1.52; six studies), cesarean delivery (13.8% compared with 14.0%; RR 0.96, 95% CI 0.85-1.08; six studies), and operative delivery (either cesarean or operative vaginal delivery) (23.9% compared with 25.1%; RR 0.93, 95% CI 0.86-1.01; six studies). CONCLUSION The use of ST analysis during labor as an adjunct to the standard cardiotocography does not improve perinatal outcomes or decrease cesarean delivery.
Collapse
|
30
|
Amer-Wahlin I, Kwee A. Combined cardiotocographic and ST event analysis: A review. Best Pract Res Clin Obstet Gynaecol 2016. [DOI: 10.1016/j.bpobgyn.2015.05.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
Abstract
BACKGROUND Hypoxaemia during labour can alter the shape of the fetal electrocardiogram (ECG) waveform, notably the relation of the PR to RR intervals, and elevation or depression of the ST segment. Technical systems have therefore been developed to monitor the fetal ECG during labour as an adjunct to continuous electronic fetal heart rate monitoring with the aim of improving fetal outcome and minimising unnecessary obstetric interference. OBJECTIVES To compare the effects of analysis of fetal ECG waveforms during labour with alternative methods of fetal monitoring. SEARCH METHODS The Cochrane Pregnancy and Childbirth Group's Trials Register (latest search 23 September 2015) and reference lists of retrieved studies. SELECTION CRITERIA Randomised trials comparing fetal ECG waveform analysis with alternative methods of fetal monitoring during labour. DATA COLLECTION AND ANALYSIS One review author independently assessed trials for inclusion and risk of bias, extracted data and checked them for accuracy. One review author assessed the quality of the evidence using the GRADE approach. MAIN RESULTS Seven trials (27,403 women) were included: six trials of ST waveform analysis (26,446 women) and one trial of PR interval analysis (957 women). The trials were generally at low risk of bias for most domains and the quality of evidence for ST waveform analysis trials was graded moderate to high. In comparison to continuous electronic fetal heart rate monitoring alone, the use of adjunctive ST waveform analysis made no obvious difference to primary outcomes: births by caesarean section (risk ratio (RR) 1.02, 95% confidence interval (CI) 0.96 to 1.08; six trials, 26,446 women; high quality evidence); the number of babies with severe metabolic acidosis at birth (cord arterial pH less than 7.05 and base deficit greater than 12 mmol/L) (average RR 0.72, 95% CI 0.43 to 1.20; six trials, 25,682 babies; moderate quality evidence); or babies with neonatal encephalopathy (RR 0.61, 95% CI 0.30 to 1.22; six trials, 26,410 babies; high quality evidence). There were, however, on average fewer fetal scalp samples taken during labour (average RR 0.61, 95% CI 0.41 to 0.91; four trials, 9671 babies; high quality evidence) although the findings were heterogeneous and there were no data from the largest trial (from the USA). There were marginally fewer operative vaginal births (RR 0.92, 95% CI 0.86 to 0.99; six trials, 26,446 women); but no obvious difference in the number of babies with low Apgar scores at five minutes or babies requiring neonatal intubation, or babies requiring admission to the special care unit (RR 0.96, 95% CI 0.89 to 1.04, six trials, 26,410 babies; high quality evidence). There was little evidence that monitoring by PR interval analysis conveyed any benefit of any sort. AUTHORS' CONCLUSIONS The modest benefits of fewer fetal scalp samplings during labour (in settings in which this procedure is performed) and fewer instrumental vaginal births have to be considered against the disadvantages of needing to use an internal scalp electrode, after membrane rupture, for ECG waveform recordings. We found little strong evidence that ST waveform analysis had an effect on the primary outcome measures in this systematic review.There was a lack of evidence showing that PR interval analysis improved any outcomes; and a larger future trial may possibly demonstrate beneficial effects.There is little information about the value of fetal ECG waveform monitoring in preterm fetuses in labour. Information about long-term development of the babies included in the trials would be valuable.
Collapse
Affiliation(s)
- James P Neilson
- The University of LiverpoolDepartment of Women's and Children's HealthFirst Floor, Liverpool Women's NHS Foundation TrustCrown StreetLiverpoolUKL8 7SS
| | | |
Collapse
|
32
|
Blix E, Brurberg KG, Reierth E, Reinar LM, Øian P. ST waveform analysis versus cardiotocography alone for intrapartum fetal monitoring: a systematic review and meta-analysis of randomized trials. Acta Obstet Gynecol Scand 2015; 95:16-27. [DOI: 10.1111/aogs.12828] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 11/18/2015] [Indexed: 11/27/2022]
Affiliation(s)
- Ellen Blix
- Faculty of Health Sciences; Oslo and Akershus University College of Applied Sciences; Oslo Norway
| | - Kjetil G. Brurberg
- The Norwegian Knowledge Center for the Health Services; Oslo Norway
- Center for Evidence Based Practice; Bergen University College; Bergen Norway
| | - Eirik Reierth
- Science and Health Library; University Library; UiT The Arctic University of Norway; Tromsø Norway
| | - Liv M. Reinar
- The Norwegian Knowledge Center for the Health Services; Oslo Norway
| | - Pål Øian
- Department of Obstetrics and Gynecology; University Hospital of North Norway; Tromsø Norway
- Department of Clinical Medicine; UiT The Arctic University of Norway; Tromsø Norway
| |
Collapse
|
33
|
|
34
|
Does an increased cesarean section rate improve neonatal outcome in term pregnancies? Arch Gynecol Obstet 2015; 294:41-6. [DOI: 10.1007/s00404-015-3942-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Accepted: 10/23/2015] [Indexed: 10/22/2022]
|
35
|
Gay E, Bornallet G, Gaucherand P, Doret M. Intrapartum electrocardiogram alteration in fetuses with congenital heart disease: a case-control study. Eur J Obstet Gynecol Reprod Biol 2015; 194:111-4. [PMID: 26360414 DOI: 10.1016/j.ejogrb.2015.08.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/27/2015] [Accepted: 08/06/2015] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To assess if the fetal electrocardiogram especially ST segment is modified by congenital heart diseases: modifications in frequencies of the different ST events and modifications in signal quality. STUDY DESIGN A retrospective case-control study, comparing frequencies of the different ST events and the quality of the signal between fetuses with congenital heart diseases and fetuses without congenital heart disease. From 2000 to 2011, fifty-eight fetuses with congenital heart disease had their heart rate recording using a STAN device during labor. Control group was fetuses who were born just before a case and had a STAN as a second line for intrapartum surveillance. Cases and controls were matched on parity, gestational age at birth, presence of growth restriction and umbilical artery pH. Frequencies of the different ST event and quality of the signal were first analyzed for the global labor recording, and then separately for the first and the second phase of labor. RESULTS No statistically significant difference in ST event frequencies between fetuses with congenital heart disease and the control group was found. Regarding the quality of the signal, 11.49% (±18.82) of recording time is a signal loss for fetus with congenital heart disease whereas only 5.18% (±10.67) for the control group (p=0.028). CONCLUSION This is the first study investigating for intrapartum electrocardiogram modification in fetus with congenital heart disease. Congenital heart diseases do not modify frequencies of ST events.
Collapse
Affiliation(s)
- Estelle Gay
- Hospices civils de Lyon, Hôpital Femme Mère Enfant, Department of Obstetrics and Gynecology, 59 boulevard Pinel, Bron Cedex F69677, France; University Lyon 1, Faculté de Médecine Lyon Est, 8 avenue Rockefeller, 69003 Lyon, France
| | - Géraldine Bornallet
- Hospices civils de Lyon, Hôpital Femme Mère Enfant, Department of Obstetrics and Gynecology, 59 boulevard Pinel, Bron Cedex F69677, France
| | - Pascal Gaucherand
- Hospices civils de Lyon, Hôpital Femme Mère Enfant, Department of Obstetrics and Gynecology, 59 boulevard Pinel, Bron Cedex F69677, France; University Lyon 1, Faculté de Médecine Lyon Est, 8 avenue Rockefeller, 69003 Lyon, France
| | - Muriel Doret
- Hospices civils de Lyon, Hôpital Femme Mère Enfant, Department of Obstetrics and Gynecology, 59 boulevard Pinel, Bron Cedex F69677, France; University Lyon 1, Faculté de Médecine Lyon Est, 8 avenue Rockefeller, 69003 Lyon, France.
| |
Collapse
|
36
|
Belfort MA, Saade GR, Thom E, Blackwell SC, Reddy UM, Thorp JM, Tita ATN, Miller RS, Peaceman AM, McKenna DS, Chien EKS, Rouse DJ, Gibbs RS, El-Sayed YY, Sorokin Y, Caritis SN, VanDorsten JP. A Randomized Trial of Intrapartum Fetal ECG ST-Segment Analysis. N Engl J Med 2015; 373:632-41. [PMID: 26267623 PMCID: PMC4631435 DOI: 10.1056/nejmoa1500600] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND It is unclear whether using fetal electrocardiographic (ECG) ST-segment analysis as an adjunct to conventional intrapartum electronic fetal heart-rate monitoring modifies intrapartum and neonatal outcomes. METHODS We performed a multicenter trial in which women with a singleton fetus who were attempting vaginal delivery at more than 36 weeks of gestation and who had cervical dilation of 2 to 7 cm were randomly assigned to "open" or "masked" monitoring with fetal ST-segment analysis. The masked system functioned as a normal fetal heart-rate monitor. The open system displayed additional information for use when uncertain fetal heart-rate patterns were detected. The primary outcome was a composite of intrapartum fetal death, neonatal death, an Apgar score of 3 or less at 5 minutes, neonatal seizure, an umbilical-artery blood pH of 7.05 or less with a base deficit of 12 mmol per liter or more, intubation for ventilation at delivery, or neonatal encephalopathy. RESULTS A total of 11,108 patients underwent randomization; 5532 were assigned to the open group, and 5576 to the masked group. The primary outcome occurred in 52 fetuses or neonates of women in the open group (0.9%) and 40 fetuses or neonates of women in the masked group (0.7%) (relative risk, 1.31; 95% confidence interval, 0.87 to 1.98; P=0.20). Among the individual components of the primary outcome, only the frequency of a 5-minute Apgar score of 3 or less differed significantly between neonates of women in the open group and those in the masked group (0.3% vs. 0.1%, P=0.02). There were no significant between-group differences in the rate of cesarean delivery (16.9% and 16.2%, respectively; P=0.30) or any operative delivery (22.8% and 22.0%, respectively; P=0.31). Adverse events were rare and occurred with similar frequency in the two groups. CONCLUSIONS Fetal ECG ST-segment analysis used as an adjunct to conventional intrapartum electronic fetal heart-rate monitoring did not improve perinatal outcomes or decrease operative-delivery rates. (Funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development and Neoventa Medical; ClinicalTrials.gov number, NCT01131260.).
Collapse
Affiliation(s)
- Michael A Belfort
- From the University of Utah Health Sciences Center, Salt Lake City (M.A.B.); University of Texas Medical Branch, Galveston (G.R.S.); the George Washington University Biostatistics Center, Washington, DC (E.T.); the University of Texas Health Science Center at Houston-Children's Memorial Hermann Hospital, Houston (S.C.B.); the Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD (U.M.R.); University of North Carolina at Chapel Hill, Chapel Hill (J.M.T.); University of Alabama at Birmingham, Birmingham (A.T.N.T.); Columbia University, New York (R.S.M.); Northwestern University, Chicago (A.M.P.); Ohio State University, Columbus (D.S.M.); MetroHealth Medical Center-Case Western Reserve University, Cleveland (E.K.S.C.); Brown University, Providence, RI (D.J.R.); University of Colorado School of Medicine, Anschutz Medical Campus, Aurora (R.S.G.); Stanford University, Stanford, CA (Y.Y.E.-S.); Wayne State University, Detroit (Y.S.); University of Pittsburgh, Pittsburgh (S.N.C.); and Medical University of South Carolina, Charleston (J.P.V.D.)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
|
38
|
Lutomski JE, Meaney S, Greene RA, Ryan AC, Devane D. Expert systems for fetal assessment in labour. THE COCHRANE DATABASE OF SYSTEMATIC REVIEWS 2015. [DOI: 10.1002/14651858.cd010708.pub2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jennifer E Lutomski
- National Perinatal Epidemiology Centre; 5th Floor, Cork University Maternity Hospital Wilton Cork Ireland
| | - Sarah Meaney
- National Perinatal Epidemiology Centre; 5th Floor, Cork University Maternity Hospital Wilton Cork Ireland
| | - Richard A Greene
- National Perinatal Epidemiology Centre; Department of Obstetrics and Gynaecology; 5th Floor, Cork University Maternity Hospital Wilton Cork Ireland
| | - Anthony C Ryan
- Cork University Maternity Hospital; Neonatology; Wilton Cork Ireland
| | - Declan Devane
- National University of Ireland Galway; School of Nursing and Midwifery; University Road Galway Ireland
| |
Collapse
|
39
|
Becker JH, Krikhaar A, Schuit E, Mårtendal A, Maršál K, Kwee A, Visser GHA, Amer-Wåhlin I. The added predictive value of biphasic events in ST analysis of the fetal electrocardiogram for intrapartum fetal monitoring. Acta Obstet Gynecol Scand 2014; 94:175-82. [PMID: 25421390 DOI: 10.1111/aogs.12548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Accepted: 11/20/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To study the predictive value of biphasic ST-events for interventions for suspected fetal distress and adverse neonatal outcome, when using ST-analysis of the fetal electrocardiogram (FECG) for intrapartum fetal monitoring. DESIGN Prospective cohort study. SETTING Three academic hospitals in Sweden. POPULATION Women in labor with a high-risk singleton fetus in cephalic position beyond 36 weeks of gestation. METHODS In women in labor who were monitored with conventional cardiotocography, ST-waveform analysis was recorded and concealed. Traces with biphasic ST-events of the FECG (index) were compared with traces without biphasic events of the FECG. The ability of biphasic events to predict interventions for suspected fetal distress and adverse outcome was assessed using univariable and multivariable logistic regression analyses. MAIN OUTCOME MEASURES Interventions for suspected fetal distress and adverse outcome (defined as presence of metabolic acidosis (i.e. umbilical cord pH <7.05 and base deficit in extracellular fluid >12 mmol), umbilical cord pH <7.00, 5-min Apgar score <7, admittance to neonatal intensive care unit or perinatal death). RESULTS Although the presence of biphasic events of the FECG was associated with more interventions for fetal distress and an increased risk of adverse outcome compared with cases with no biphasic events, the presence of significant (i.e. intervention advised according to cardiotocography interpretation) biphasic events showed no independent association with interventions for fetal distress [odds ratio (OR) 1.71, 95% confidence interval (CI) 0.65-4.50] or adverse outcome (OR 1.96, 95% CI 0.74-5.24). CONCLUSION The presence of significant biphasic events did not discriminate in the prediction of interventions for fetal distress or adverse outcome. Therefore, biphasic events in relation to ST-analysis monitoring during birth should be omitted if future studies confirm our findings.
Collapse
Affiliation(s)
- Jeroen H Becker
- Department of Obstetrics and Gynecology, Zuwe Hofpoort Hospital, Woerden, the Netherlands
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Hines M, Swinburn K, McIntyre S, Novak I, Badawi N. Infants at risk of cerebral palsy: a systematic review of outcomes used in Cochrane studies of pregnancy, childbirth and neonatology. J Matern Fetal Neonatal Med 2014; 28:1871-83. [PMID: 25283846 DOI: 10.3109/14767058.2014.972355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE To systematically review meta-analyses (MAs) and randomised controlled trials (RCTs) of interventions for infants at risk of cerebral palsy (CP), to determine if consensus exists in study end-points. METHODS MAs within the "Neonatal" and "Pregnancy and Childbirth" Review Groups in Cochrane Database of Systematic Reviews (to June 2011) were included if they contained risk factors for CP as a study end-point, and were either published in 2010 or 2011 or cited >20 times in Sciverse Scopus. Up to 20 RCTs from each MA were included. Outcome measures, definitions and cut-points for ordinal groupings were extracted from MAs and RCTs and frequencies calculated. RESULTS Twenty-two MAs and 165 RCTs were appraised. High consistency existed in types of outcome domains listed as important in MAs. For 10/16 most frequently cited outcome domains, <50% of RCTs contributed data for meta-analyses. Low consistency in outcome definitions, measures, cut-points in RCTs and long-term follow-up prohibited data aggregation. CONCLUSIONS Variation in outcome measurement and long-term follow up has hampered the ability of RCTs to contribute data on important outcomes for CP, resulting in lost opportunities to measure the impact of maternal and neonatal interventions. There is an urgent need for and long-term follow up of these interventions and an agreed set of standardised and clinically relevant common data elements for study end-points.
Collapse
Affiliation(s)
- Monique Hines
- a Cerebral Palsy Alliance Research Institute , Darlinghurst , Australia
| | - Katherine Swinburn
- a Cerebral Palsy Alliance Research Institute , Darlinghurst , Australia .,b School of Medicine, University of Notre Dame Australia , Darlinghurst , Australia
| | - Sarah McIntyre
- a Cerebral Palsy Alliance Research Institute , Darlinghurst , Australia .,b School of Medicine, University of Notre Dame Australia , Darlinghurst , Australia
| | - Iona Novak
- a Cerebral Palsy Alliance Research Institute , Darlinghurst , Australia .,b School of Medicine, University of Notre Dame Australia , Darlinghurst , Australia
| | - Nadia Badawi
- a Cerebral Palsy Alliance Research Institute , Darlinghurst , Australia .,b School of Medicine, University of Notre Dame Australia , Darlinghurst , Australia .,c Discipline of Paediatrics & Child Health, Sydney Medical School, University of Sydney , Sydney , Australia , and.,d The Children's Hospital at Westmead, Grace Centre for Newborn Care , Westmead , Australia
| |
Collapse
|
41
|
Abstract
AIMS Detection and careful stratification of fetal heart rate (FHR) is extremely important in all pregnancies. The most lethal cardiac rhythm disturbances occur during apparently normal pregnancies where FHR and rhythm are regular and within normal or low-normal ranges. These hidden depolarization and repolarization abnormalities, associated with genetic ion channelopathies cannot be detected by echocardiography, and may be responsible for up to 10% of unexplained fetal demise, prompting a need for newer and better fetal diagnostic techniques. Other manifest fetal arrhythmias such as premature beats, tachycardia, and bradycardia are commonly recognized. METHODS Heart rhythm diagnosis in obstetrical practice is usually made by M-mode and pulsed Doppler fetal echocardiography, but not all fetal cardiac time intervals are captured by echocardiographic methods. RESULTS AND CONCLUSIONS This article reviews different types of fetal arrhythmias, their presentation and treatment strategies, and gives an overview of the present and future diagnostic techniques.
Collapse
Affiliation(s)
| | - Janette F. Strasburger
- Division of Cardiology, Department of Pediatrics, Children’s Hospital of Wisconsin-Milwaukee and Fox Valley, Milwaukee, Wisconsin
| | - Bettina F. Cuneo
- Department of Pediatrics, Children’s Hospital Colorado, The Heart Institute, The University of Colorado School of Medicine, Denver, Colorado
| | - Ronald T. Wakai
- Department of Medical Physics, University of Wisconsin, Madison, Wisconsin
| |
Collapse
|
42
|
Olofsson P, Ayres-de-Campos D, Kessler J, Tendal B, Yli BM, Devoe L. A critical appraisal of the evidence for using cardiotocography plus ECG ST interval analysis for fetal surveillance in labor. Part I: the randomized controlled trials. Acta Obstet Gynecol Scand 2014; 93:556-68; discussion 568-9. [PMID: 24797452 PMCID: PMC4670694 DOI: 10.1111/aogs.12413] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 04/30/2014] [Indexed: 11/30/2022]
Abstract
We reappraised the five randomized controlled trials that compared cardiotocography plus ECG ST interval analysis (CTG+ST) vs. cardiotocography. The numbers enrolled ranged from 5681 (Dutch randomized controlled trial) to 799 (French randomized controlled trial). The Swedish randomized controlled trial (n = 5049) was the only trial adequately powered to show a difference in metabolic acidosis, and the Plymouth randomized controlled trial (n = 2434) was only powered to show a difference in operative delivery for fetal distress. There were considerable differences in study design: the French randomized controlled trial used different inclusion criteria, and the Finnish randomized controlled trial (n = 1483) used a different metabolic acidosis definition. In the CTG+ST study arms, the larger Plymouth, Swedish and Dutch trials showed lower operative delivery and metabolic acidosis rates, whereas the smaller Finnish and French trials showed minor differences in operative delivery and higher metabolic acidosis rates. We conclude that the differences in outcomes are likely due to the considerable differences in study design and size. This will enhance heterogeneity effects in any subsequent meta-analysis.
Collapse
Affiliation(s)
- Per Olofsson
- Department of Obstetrics and Gynecology, Institution of Clinical Sciences, Skåne University Hospital, Lund University, Malmö, Sweden
| | | | | | | | | | | |
Collapse
|
43
|
Kessler J, Moster D, Albrechtsen S. Intrapartum monitoring with cardiotocography and ST-waveform analysis in breech presentation: an observational study. BJOG 2014; 122:528-35. [DOI: 10.1111/1471-0528.12989] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/29/2014] [Indexed: 11/28/2022]
Affiliation(s)
- J Kessler
- Department of Obstetrics and Gynaecology; Haukeland University Hospital; Bergen Norway
- Department of Clinical Science; Research Group for Pregnancy, Fetal Development and Birth; University of Bergen; Bergen Norway
| | - D Moster
- Department of Health Registries; Norwegian Institute of Public Health; Bergen Norway
- Department of Paediatrics; Haukeland University Hospital; Bergen Norway
- Department of Global Public Health and Primary Care; University of Bergen; Bergen Norway
| | - S Albrechtsen
- Department of Obstetrics and Gynaecology; Haukeland University Hospital; Bergen Norway
- Department of Clinical Science; Research Group for Pregnancy, Fetal Development and Birth; University of Bergen; Bergen Norway
| |
Collapse
|
44
|
Olofsson P, Ayres-de-Campos D, Kessler J, Tendal B, Yli BM, Devoe L. A critical appraisal of the evidence for using cardiotocography plus ECG ST interval analysis for fetal surveillance in labor. Part II: the meta-analyses. Acta Obstet Gynecol Scand 2014; 93:571-86; discussion 587-8. [PMID: 24797318 PMCID: PMC4670718 DOI: 10.1111/aogs.12412] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Accepted: 04/30/2014] [Indexed: 11/27/2022]
Abstract
We appraised the methodology, execution and quality of the five published meta-analyses that are based on the five randomized controlled trials which compared cardiotocography (CTG)+ST analysis to cardiotocography. The meta-analyses contained errors, either created de novo in handling of original data or from a failure to recognize essential differences among the randomized controlled trials, particularly in their inclusion criteria and outcome parameters. No meta-analysis contained complete and relevant data from all five randomized controlled trials. We believe that one randomized controlled trial excluded in two of the meta-analyses should have been included, whereas one randomized controlled trial that was included in all meta-analyses, should have been excluded. After correction of the uncovered errors and exclusion of the randomized controlled trial that we deemed inappropriate, our new meta-analysis showed that CTG+ST monitoring significantly reduces the fetal scalp blood sampling usage (risk ratio 0.64; 95% confidence interval 0.47-0.88), total operative delivery rate (0.93; 0.88-0.99) and metabolic acidosis rate (0.61; 0.41-0.91).
Collapse
Affiliation(s)
- Per Olofsson
- Department of Obstetrics and Gynecology, Institution of Clinical Sciences, Skåne University Hospital, Lund UniversityMalmö, Sweden
| | - Diogo Ayres-de-Campos
- Department of Obstetrics and Gynecology, Medical School – S. Joao Hospital, Institute of Biomedical Engineering, Porto UniversityPorto, Portugal
| | - Jörg Kessler
- Department of Obstetrics and Gynecology, Haukeland University HospitalBergen, Norway
- Department of Clinical Sciences, Clinical Fetal Physiology Research Group, Bergen UniversityBergen, Norway
| | - Britta Tendal
- Danish Health and Medicines AuthorityCopenhagen, Denmark
| | - Branka M Yli
- Delivery Department, Mother and Child Clinic, Oslo University HospitalOslo, Norway
| | - Lawrence Devoe
- Department of Obstetrics and Gynecology, Medical College of Georgia, Georgia Regents UniversityAugusta, Georgia, USA
| |
Collapse
|
45
|
Visser GH, Kessler J. It is time to introduce ST analysis for fetal monitoring in the labor ward? Acta Obstet Gynecol Scand 2014; 93:539-43. [DOI: 10.1111/aogs.12397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 04/22/2014] [Indexed: 11/27/2022]
Affiliation(s)
- Gerard H.A. Visser
- Department of Obstetrics; University Medical Center; Utrecht the Netherlands
| | - Jørg Kessler
- Department of Obstetrics and Gynecology; Haukeland University Hospital; Bergen Norway
| |
Collapse
|
46
|
Donofrio MT, Moon-Grady AJ, Hornberger LK, Copel JA, Sklansky MS, Abuhamad A, Cuneo BF, Huhta JC, Jonas RA, Krishnan A, Lacey S, Lee W, Michelfelder EC, Rempel GR, Silverman NH, Spray TL, Strasburger JF, Tworetzky W, Rychik J. Diagnosis and treatment of fetal cardiac disease: a scientific statement from the American Heart Association. Circulation 2014; 129:2183-242. [PMID: 24763516 DOI: 10.1161/01.cir.0000437597.44550.5d] [Citation(s) in RCA: 707] [Impact Index Per Article: 70.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND The goal of this statement is to review available literature and to put forth a scientific statement on the current practice of fetal cardiac medicine, including the diagnosis and management of fetal cardiovascular disease. METHODS AND RESULTS A writing group appointed by the American Heart Association reviewed the available literature pertaining to topics relevant to fetal cardiac medicine, including the diagnosis of congenital heart disease and arrhythmias, assessment of cardiac function and the cardiovascular system, and available treatment options. The American College of Cardiology/American Heart Association classification of recommendations and level of evidence for practice guidelines were applied to the current practice of fetal cardiac medicine. Recommendations relating to the specifics of fetal diagnosis, including the timing of referral for study, indications for referral, and experience suggested for performance and interpretation of studies, are presented. The components of a fetal echocardiogram are described in detail, including descriptions of the assessment of cardiac anatomy, cardiac function, and rhythm. Complementary modalities for fetal cardiac assessment are reviewed, including the use of advanced ultrasound techniques, fetal magnetic resonance imaging, and fetal magnetocardiography and electrocardiography for rhythm assessment. Models for parental counseling and a discussion of parental stress and depression assessments are reviewed. Available fetal therapies, including medical management for arrhythmias or heart failure and closed or open intervention for diseases affecting the cardiovascular system such as twin-twin transfusion syndrome, lung masses, and vascular tumors, are highlighted. Catheter-based intervention strategies to prevent the progression of disease in utero are also discussed. Recommendations for delivery planning strategies for fetuses with congenital heart disease including models based on classification of disease severity and delivery room treatment will be highlighted. Outcome assessment is reviewed to show the benefit of prenatal diagnosis and management as they affect outcome for babies with congenital heart disease. CONCLUSIONS Fetal cardiac medicine has evolved considerably over the past 2 decades, predominantly in response to advances in imaging technology and innovations in therapies. The diagnosis of cardiac disease in the fetus is mostly made with ultrasound; however, new technologies, including 3- and 4-dimensional echocardiography, magnetic resonance imaging, and fetal electrocardiography and magnetocardiography, are available. Medical and interventional treatments for select diseases and strategies for delivery room care enable stabilization of high-risk fetuses and contribute to improved outcomes. This statement highlights what is currently known and recommended on the basis of evidence and experience in the rapidly advancing and highly specialized field of fetal cardiac care.
Collapse
|
47
|
Steer PJ, Hvidman LE. Scientific and clinical evidence for the use of fetal ECG ST segment analysis (STAN). Acta Obstet Gynecol Scand 2014; 93:533-8. [PMID: 24597897 DOI: 10.1111/aogs.12369] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 02/27/2014] [Indexed: 11/29/2022]
Abstract
Fetal electrocardiogram waveform analysis has been studied for many decades, but it is only in the last 20 years that computerization has made real-time analysis practical for clinical use. Changes in the ST segment have been shown to correlate with fetal condition, in particular with acid-base status. Meta-analysis of randomized trials (five in total, four using the computerized system) has shown that use of computerized ST segment analysis (STAN) reduces the need for fetal blood sampling by about 40%. However, although there are trends to lower rates of low Apgar scores and acidosis, the differences are not statistically significant. There is no effect on cesarean section rates. Disadvantages include the need for amniotic membranes to be ruptured so that a fetal scalp electrode can be applied, and the need for STAN values to be interpreted in conjunction with detailed fetal heart rate pattern analysis.
Collapse
Affiliation(s)
- Philip J Steer
- Academic Department of Obstetrics and Gynecology, Division of Cancer, Chelsea and Westminster Hospital, London, UK
| | | |
Collapse
|
48
|
Fetal ECG extraction from abdominal signals: a review on suppression of fundamental power line interference component and its harmonics. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2014; 2014:239060. [PMID: 24660020 PMCID: PMC3934549 DOI: 10.1155/2014/239060] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 11/11/2013] [Accepted: 12/20/2013] [Indexed: 11/18/2022]
Abstract
Interference of power line (PLI) (fundamental frequency and its harmonics) is usually present in biopotential measurements. Despite all countermeasures, the PLI still corrupts physiological signals, for example, electromyograms (EMG), electroencephalograms (EEG), and electrocardiograms (ECG). When analyzing the fetal ECG (fECG) recorded on the maternal abdomen, the PLI represents a particular strong noise component, being sometimes 10 times greater than the fECG signal, and thus impairing the extraction of any useful information regarding the fetal health state. Many signal processing methods for cancelling the PLI from biopotentials are available in the literature. In this review study, six different principles are analyzed and discussed, and their performance is evaluated on simulated data (three different scenarios), based on five quantitative performance indices.
Collapse
|
49
|
Chudáček V, Spilka J, Burša M, Janků P, Hruban L, Huptych M, Lhotská L. Open access intrapartum CTG database. BMC Pregnancy Childbirth 2014; 14:16. [PMID: 24418387 PMCID: PMC3898997 DOI: 10.1186/1471-2393-14-16] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 12/06/2013] [Indexed: 11/10/2022] Open
Abstract
Background Cardiotocography (CTG) is a monitoring of fetal heart rate and uterine contractions. Since 1960 it is routinely used by obstetricians to assess fetal well-being. Many attempts to introduce methods of automatic signal processing and evaluation have appeared during the last 20 years, however still no significant progress similar to that in the domain of adult heart rate variability, where open access databases are available (e.g. MIT-BIH), is visible. Based on a thorough review of the relevant publications, presented in this paper, the shortcomings of the current state are obvious. A lack of common ground for clinicians and technicians in the field hinders clinically usable progress. Our open access database of digital intrapartum cardiotocographic recordings aims to change that. Description The intrapartum CTG database consists in total of 552 intrapartum recordings, which were acquired between April 2010 and August 2012 at the obstetrics ward of the University Hospital in Brno, Czech Republic. All recordings were stored in electronic form in the OB TraceVue®;system. The recordings were selected from 9164 intrapartum recordings with clinical as well as technical considerations in mind. All recordings are at most 90 minutes long and start a maximum of 90 minutes before delivery. The time relation of CTG to delivery is known as well as the length of the second stage of labor which does not exceed 30 minutes. The majority of recordings (all but 46 cesarean sections) is – on purpose – from vaginal deliveries. All recordings have available biochemical markers as well as some more general clinical features. Full description of the database and reasoning behind selection of the parameters is presented in the paper. Conclusion A new open-access CTG database is introduced which should give the research community common ground for comparison of results on reasonably large database. We anticipate that after reading the paper, the reader will understand the context of the field from clinical and technical perspectives which will enable him/her to use the database and also understand its limitations.
Collapse
Affiliation(s)
- Václav Chudáček
- Department of Cybernetics, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic.
| | | | | | | | | | | | | |
Collapse
|
50
|
Phipps H, de Vries B, Kuah S, Hyett JA. When should women be recruited to intrapartum research projects? A retrospective review. Acta Obstet Gynecol Scand 2013; 92:1264-70. [DOI: 10.1111/aogs.12243] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 07/29/2013] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Sabrina Kuah
- Women's and Children's Hospital; Adelaide; South Australia; Australia
| | | |
Collapse
|