Trial of labor following cesarean delivery

Obstet Gynecol. 1994 Jun;83(6):933-6. doi: 10.1097/00006250-199406000-00006.


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.

Conclusion: 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.

MeSH terms

  • Apgar Score
  • Cesarean Section, Repeat* / adverse effects
  • Female
  • Humans
  • Infant, Newborn
  • Labor, Induced
  • Pregnancy
  • Prospective Studies
  • Trial of Labor*
  • Uterine Hemorrhage / etiology
  • Uterine Rupture / diagnosis
  • Uterine Rupture / etiology