The role of Bishop score in predicting the outcome of labour induction by membrane sweeping

Abstract

Objectives: To determine the outcome of labour induction by sweeping membrane and related factors. Evaluating the role of Bishop score in predicting the outcome of labour induction.

Methods: we conducted a cross section study on 85 singleton pregnancies who have been induced labour by membrane sweeping at Hue university of Medicine and Pharmacy Hospital in 5/2019 – 5/2020.

Results: The rate of onset spontaneous labour within 24 hours after membrane sweeping was 49.4%, the rate of onset spontaneous labour without using another labour induction methods was 71.8%. The vaginal delivery rate was 36.5%. We found that the Bishop score was associated with spontaneous labour within 12 hours after sweepping (OR: 3.0; 95% CI: 1.4 – 6.4; p = 0.01) and 24 hours after sweepping (OR 5.2; 95% CI 2.3 – 11.7; p < 0.0001) and the time of spontaneous onset of labour (β: -8.2; 95% CI: -11.5 – -4.5; p < 0.0001), but we did not find any relation between the Bishop score and spontaneous labour within 6 hours. The probability of spontaneous onset of labour within 12 – 24 hours was 73% in pregnant women who have the Bishop score increased by 2 points after membrane sweeping 12 hours, the estimated time of spontaneous onset of labour about 4 additional hours.

Conclusions: The outcomes of sweeping membrane was acceptable. We recommend using the Bishop score at the time of sweeping membrane and the difference between Bishop score after sweeping 12 hours to to predict the probability and the stimated time of spontaneous onset of labour.