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Am J Perinatol 2019; 36(01): 053-061
DOI: 10.1055/s-0038-1660467
SMFM Fellowship Series Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Mode of Delivery in Previable Births

Robert M. Rossi
1   Center for Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
2   Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, Cincinnati, Ohio
,
Emily A. DeFranco
1   Center for Prevention of Preterm Birth, Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio
2   Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Cincinnati College of Medicine, Cincinnati, Ohio
› Institutsangaben
Funding This study was supported by the Perinatal Institute, Cincinnati Children's Hospital Medical Center, Cincinnati, OH; March of Dimes Grant 22-FY14–470
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Publikationsverlauf

28. November 2017

02. Mai 2018

Publikationsdatum:
08. Juni 2018 (online)

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Abstract

Objective Preterm birth before 23 weeks of gestation typically results in neonatal death (5% survival). Society for Maternal-Fetal Medicine and American College of Obstetricians and Gynecologists published consensus guidelines recommending cesarean delivery (CD) not be performed for fetal indications between 20 and 226/7 weeks given the lack of proven benefit. We sought to quantify the previable CD rate and identify characteristics associated with previable CD.

Methods We performed a population-based retrospective cohort study of all live births in Ohio (2006–2015). Frequency of previable CD was stratified by week of gestation, defined as delivery between 16 and < 23 weeks of gestation. Maternal, obstetric, and neonatal characteristics were compared between women who underwent vaginal delivery versus CD. Multivariable logistic regression estimated the relative influence of maternal and fetal factors on the outcome of CD among previable live births.

Results Of 1,463,506 live births in Ohio during the 10-year study period, 2,865 births (0.2%) occurred during the previable period of 16 to 22 weeks. Nearly 1 in 10 live births at less than 23 weeks was delivered by cesarean (n = 273/2,865), CD rate 9.5% (95% confidence interval, 8.5–10.7). At 16 to 22 weeks of gestation, the CD rates were 0, 5.5, 7.6, 3.5, 5.4, 10.1, and 15.1%, respectively. Factors associated with CD included increasing parity, increasing birth weight, maternal corticosteroid administration, and fetal malpresentation. Previable neonates born by CD were more likely to be admitted to the NICU, receive ventilator support, and more likely to be living at the time of birth certificate filing.

Conclusion Nearly 1 out of 10 births during the previable period was delivered via cesarean. Factors associated with previable CD suggest intent for neonatal interventions, such as NICU admission and supportive therapies. Our findings support that education and adherence with guidelines for care of previable births are a potential area of focus for perinatal quality improvement efforts.

Keywords

previable - cesarean - mode of delivery

Note

This study was presented as a poster at the Society for Maternal-Fetal Medicine's 37th Annual Pregnancy Meeting, January 23–28, 2017, Las Vegas, NV, Poster Abstract # 831. This study includes data provided by the Ohio Department of Health, which should not be considered an endorsement of this study or its conclusions.