Value of transvaginal ultrasonography versus Bishop Score in predicting successful induction of labor

Background: Induction of labor is a widely used intervention in modern labor. Bishop score, the gold standard for assessing favourability for induction of labor is very subjective with a poor predictive value.Objective: To compare the transvaginal ultrasonography and the score proposed by Kepansereel in prediction of success of labor induction.Patients and Methods: A prospective study involved 50 women subjected to induction of labor. Preinduction assessment of Bishop score and ultrasound measurement of cervical length, posterior cervical angle and cervical funnelling was done.Results: 35 and 15 cases had successful and unsuccessful induction .Cervical length was significantly longer and posterior cervical angle was significantly larger in cases of failed induction (p < 0.001 for both). The Bishop score and Keepanasseril core were significantly lower in association with induction failure (p < 0.001 for both).Conclusion: Successful induction correlated significantly with the Bishop score and ultrasonographic cervical length and posterior cervical angle.