Transvaginal Sonographic Assessment of the Cervix for Prediction of Successful Induction of Labor in Nulliparous Women

摘要

Background: Induction of labor is commonly performed in obstetric practice. Many methods have been suggested as good predictors of the outcome of labor induction, yet none of them is satisfactory enough. Our study aims to assess cervical length and uterocervical angle measured by transvaginal ultrasound as predictors of successful induction of labor. Methods: Prospective cohort study conducted in Ain Shams University Maternity hospital over 150 nulliparous women undergoing induction of labor, in the period between May 2018 and August 2019. Transvaginal sonographic measurement of cervical length and uterocervical angle was done before induction of labor by prostaglandins. The patients were followed up till delivery and the outcome was recorded. Results: The best cut-off value of cervical length for prediction of success of labor induction was 32.3 mm with 60% sensitivity and 56% specificity and the best cut-off value of uterocervical angle was 110.2 degrees with 87% sensitivity and 93% specificity. The cervical length showed a significant negative correlation while the uterocervical angle showed a significant positive correlation with the success of labor induction. Conclusion: Cervical length and uterocervical angle are good predictors of successful labor induction.