title: Cesarean delivery rates at the threshold of viability.
abstract: OBJECTIVE
  The purpose of this study was to assess whether the treatment of deliveries at the traditional threshold of viability has become more interventional since the publication of higher survival rates.
  
  
  METHODS
  State vital statistic data from 1995 to 2000 were reviewed to identify deliveries at 22 to 25 weeks of gestation with a birth weight of <1 kg. Demographic data and frequency of cesarean delivery, antepartum bleeding, breech presentation, fetal distress, and cord prolapse were recorded. The cesarean delivery rate and the neonatal mortality rate were calculated for each year. Linear regression for cesarean delivery rate versus year and for neonatal mortality rate versus year were performed at each gestational age.
  
  
  RESULTS
  Of 2924 births that met the study criteria, 1005 births (34.4%) were by cesarean delivery. The cesarean delivery rate at 23 weeks rose from 15.9% in 1995 to 28.2% in 2000 (P =.023). Demographic/obstetric factors did not vary with year of delivery. The neonatal mortality rate remained unchanged.
  
  
  CONCLUSIONS
  These data suggest an increasingly aggressive approach to deliveries at the threshold of viability, beginning at 23 weeks of gestation.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Wayne State University, Hutzel Hospital, 4707 St. Antoine Boulevard, Detroit, MI 48201, USA. mredman@med.wayne.edu
authors.forename: Mark E
authors.initials: ME
authors.lastname: Redman
authors.forename: Bernard
authors.initials: B
authors.lastname: Gonik
mesh_terms: D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data*; D005260:Female; D005328:Fetal Viability; D005865:Gestational Age; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D011247:Pregnancy