Sonographic cervical length predicts vaginal delivery after previous cesarean section in women with low Bishop score induced with a double-balloon catheter.

Objective: To assess the role of cervical length when predicting vaginal delivery after a previous cesarean section (CS) in women with low Bishop score following the use of a double-balloon catheter for induction of labor (IOL).

Methods: A prospective, longitudinal study was conducted at a large teaching hospital in Santiago to recruit pregnant women at term with a previous CS and Bishop score ≤6 for IOL with a double-balloon catheter. The device was maintained for up to 24 h and the patient continued IOL with oxytocin only if the Bishop score was >6.