title: Trial of labor following cesarean delivery.
abstract: OBJECTIVE
  To examine several variables that may affect the success rate for a trial of labor after previous cesarean delivery, as well as those affecting the rate of uterine rupture.
  
  
  METHODS
  Between June 1, 1990 and December 31, 1991, we performed a consecutive, prospective study of 593 pregnant women who had had at least one abdominal delivery in the past, and attempted a trial of labor in each. Particular attention was given to the success rate of vaginal delivery, the type of previous uterine incision, use of oxytocin, estimated maternal blood loss, 5-minute Apgar scores, and reason for the previous cesarean operation.
  
  
  RESULTS
  Four hundred seventy-eight patients (81%) had a successful vaginal delivery. Oxytocin induction or augmentation was successful in 46 of 67 (69%) and 117 of 167 cases (70%), respectively. Estimated maternal blood loss was less than 500 mL in 453 cases (95%). Five patients (0.8%) experienced true uterine rupture, resulting in severe neurologic sequelae in one infant. The only consistent indication of uterine rupture was an abrupt and prolonged fetal bradycardia. The majority (463; 97%) of infants who were delivered vaginally had 5-minute Apgar scores of 8 or greater.
  
  
  CONCLUSIONS
  Our success rate of 81% suggests that a trial of labor after previous cesarean delivery is a safe and desirable option, but only after thorough patient counseling. An abrupt and persistent fetal bradycardia may be the only indication that uterine rupture has occurred.
authors.affiliation: Department of Obstetrics and Gynecology, John Peter Smith Hospital, Fort Worth, Texas.
authors.forename: R K
authors.initials: RK
authors.lastname: Cowan
authors.forename: R A
authors.initials: RA
authors.lastname: Kinch
authors.forename: B
authors.initials: B
authors.lastname: Ellis
authors.forename: R
authors.initials: R
authors.lastname: Anderson
mesh_terms: D001034:Apgar Score; D017604:Cesarean Section, Repeat / Q000009:adverse effects; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007751:Labor, Induced; D011247:Pregnancy; D011446:Prospective Studies; D014219:Trial of Labor; D014592:Uterine Hemorrhage / Q000209:etiology; D014597:Uterine Rupture / Q000175:diagnosis / Q000209:etiology