Title: P16.10: Bishop score and transvaginal ultrasound cervical assessment for the prediction of successful induction of labour
Abstract: To compare Bishop score and transvaginal ultrasound cervical length measurements to predict successful induction of labour. We performed a prospective observational study on women undergoing induction of labour at term. Inclusion criteria were gestational age between 37 and 42 weeks, singleton cephalic presentation with intact membranes. All women has both digital examination to assess Bishop score and transvaginal ultrasound scan for cervical length. Induction of labour was performed using 10 mg intravaginal prostaglandin (propess) for primiparous women and 1 mg prostin for multiparous women repeated every six hours, up to a maximum of 3 doses. Induction was subsequently continued by amniotomy and oxytocin. A total of 79 women were prospectively recruited for the study. Demographic characteristics are demonstrated in table 1. Mean Bishop scores for successful and failed induction were 3.5 (95% CI, 3.0–4.1) and 1.5 (95% CI, 0.2–2.7), respectively (P = 0.004). Mean pre-induction cervical length for successful and failed induction were 21 (95% CI, 19–24) and 30 (95% CI, 24–35), respectively, (P = 0.007). Our results show that both Bishop scores and transvaginal measurement of cervical length does predict successful induction of labour and vaginal delivery with good accuracy. In women with failed induction of labour, mean Bishop score was lower and mean cervical length was higher compared with women with successful induction of labour.