title: Rate of uterine rupture during a trial of labor in women with one or two prior cesarean deliveries.
abstract: OBJECTIVE
  We sought to determine whether there is a difference in the rate of symptomatic uterine rupture after a trial of labor in women who have had 1 versus 2 prior cesarean deliveries.
  
  
  METHODS
  The medical records of all women with a history of either 1 or 2 prior cesarean deliveries who elected to undergo a trial of labor during a 12-year period (July 1984-June 1996) at the Brigham and Women's Hospital were reviewed. Rates of uterine rupture were compared for these 2 groups. Potential confounding variables were controlled by using logistic regression analyses.
  
  
  RESULTS
  Women with 1 prior cesarean delivery (n = 3757) had a rate of uterine rupture of 0.8%, whereas women with 2 prior cesarean deliveries (n = 134) had a rate of uterine rupture of 3.7% (P =.001). In a logistic regression analysis that was controlled for maternal age, use of epidural analgesia, oxytocin induction, oxytocin augmentation, the use of prostaglandin E(2) gel, birth weight, gestational age, type of prior hysterotomy, year of trial of labor, and prior vaginal delivery, the odds ratio for uterine rupture in those patients with 2 prior cesarean deliveries was 4.8 (95% confidence interval, 1.8-13. 2)
  
  
  CONCLUSIONS
  Women with a history of 2 prior cesarean deliveries have an almost 5-fold greater risk of uterine rupture than those with only 1 prior cesarean delivery.
authors.affiliation: Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
authors.forename: A B
authors.initials: AB
authors.lastname: Caughey
authors.forename: T D
authors.initials: TD
authors.lastname: Shipp
authors.forename: J T
authors.initials: JT
authors.lastname: Repke
authors.forename: C M
authors.initials: CM
authors.lastname: Zelop
authors.forename: A
authors.initials: A
authors.lastname: Cohen
authors.forename: E
authors.initials: E
authors.lastname: Lieberman
mesh_terms: D000328:Adult; D002585:Cesarean Section; D017604:Cesarean Section, Repeat; D005260:Female; D006801:Humans; D007044:Hysterectomy; D016015:Logistic Models; D011247:Pregnancy; D011256:Pregnancy Outcome; D013997:Time Factors; D014219:Trial of Labor; D001743:Urinary Bladder / Q000293:injuries; D014597:Uterine Rupture / Q000150:complications / Q000453:epidemiology* / Q000601:surgery