[Indicators for successful vaginal delivery after cesarean section: a proposal of a predictive score]. / Les indicateurs de succes de l'accouchement par voie basse sur uterus cicatriciel: proposition d'un score predictif.

The purpose of this study is to determine predictive factors of successful vaginal delivery after cesarean section, and to estimate the risks of this trial of labor (TOL). A retrospective study about 352 women undergoing a TOL after cesarean section was carried out. Different variables stratified by the termination of the TOL were analysed with statistic tests. TOL success rate was 76.1%. Parity > or = 3. prior vaginal delivery following cesarean section, body mass index < 30, fundal height < 34 cm, and low fetal head level at the beginning of labor increased significantly the probability of success. Uterine rupture rate is 1.1%. Failure of TOL was associated with a higher risk of uterine scar dehiscence and rupture, and higher fetal morbidity. A predictive score of successful vaginal delivery after cesarean section is proposed.