Author(s): Sabry Sayed Mohamed Hassan, Ahmed Elsayed Ahmed Omar*, Ahmed Mohamed Essam and El-Din Mahmoud Mansour
Objective: “Bishop score has been used to predict successful labor induction; however, ultrasound detecting cervical parameters (cervical length and posterior-cervical angle) may be superior to Bishop score. The present study was an effort to determine which is better for predicting successful labor induction.
Methods: A prospective observational study has been performed on 100 pregnant women with 37-41 weeks’ gestational age who had been acclaimed to undergo labor induction. Cervical length, posterior cervical angle, and Bishop score were also assessed and their relations to successful induction of labor were evaluated.
Results: The posterior cervical angle sensitivity, specificity, and accuracy for predicting successful labor induction were 92%, 89%, and 89%, respectively, which were superior to those of Bishop score as well as cervical length. Moreover, both posterior cervical angle and cervical length combined use for predicting the successful labor induction show sensitivity 94%, specificity 91%, and accuracy 91%. Using ROC curve, our results showed that the best area under curve (AUC) is for combined ultrasonographic parameters (0.940, 95% CI 0.823 – 0.901).
Conclusion: For predicting the labor induction outcome, the combined use of both cervical length and posterior cervical angle was superior to the Bishop score.