Association between placental site and successful induction of labor among postdate primiparous women.

Purpose: This study aimed to determine the association between placental site and successful labor induction.

Methods: This cross-sectional study recruited all postdate primiparous women undergoing induction of labor. Eligible women were subjected to proper history taking and clinical examination. Vaginal examination to determine the bishop score was done. Routine antenatal scan was done for fetal biometry and the placental site. Transvaginal ultrasound was done for cervical length assessment. Induction of labor was commenced and women were subdivided into those with successful induction (delivered vaginally) and those with failed induction (needed cesarean delivery).

Results: Successful induction was achieved in 73/91 (80.2%) participants. The bishop score was significantly increased among women with successful induction (4.6 ± 0.9 vs 3.9 ± 1.1, p value 0.014). In addition, the cervical length was significantly shorter among those who delivered vaginally (2.6 ± 0.5 vs 4.2 ± 0.5, p value 0.0001). There was no significant difference in the placental site among women with failed or successful induction. The cervical length was the only significant predictor for successful induction of labor (p value 0.0001). The placental site showed a non-significant role in the prediction of successful vaginal delivery (p value 0.280).

Conclusion: The placental site is not associated with the outcome of labor induction. The cervical length was the significant predictor for successful induction of labor.