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Sonographic cervical length measurement before labor induction in VBAC
Abstract Number: 84
Abstract Type: Original Research
Vaginal birth after cesarean section(VBAC) is association with a small but significant risk of uterine rupture with poor outcomes for both mother and infant. The purpose the study was to determine if transvaginal sonographic measurement of the cervical length is useful method to predict successful labor induction in VBAC.
57 women who were scheduled for medically indicated induction of labor had a transvaginal sonographic measurement of the cervical length before labor induction. Induction of labor was performed within 4 hours of the ultrasonographic examination, by oxytocin only. The length of labor and delivery mode was checked. We constructed a receiver operator characteristic (ROC) curve to determine the optimal cut-off point of the cervical length, to predict cesarean section.
VBAC success rate was 54.4%. Bishop score and cervical length were significantly association with labor duration. The ROC curve showed that the optimal cut-off point of cervical length was 2.0cm. The predictive values of cervical length on VBAC failure were: 76.47% of sensitivity; 42.5% of specificity; respectively.
Transvaginal sonographic measurement of cervical length is good predictor of a failure of VBAC.