Transvaginal ultrasound and digital examination for predicting successful labour induction in postterm pregnancy

Chandra, Sujata (2005) Transvaginal ultrasound and digital examination for predicting successful labour induction in postterm pregnancy. Masters thesis, Memorial University of Newfoundland.

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Abstract

Objective: To compare transvaginal ultrasound and digital cervical examination in predicting successful induction in post-term pregnancy. Methods: Transvaginal ultrasound and digital examinations were performed on 122 women at 41 or more weeks' gestation, immediately before labor induction. Ultrasound assessments of cervical length, dilatation, and presence of funneling were compared with the components of the Bishop score. The primary outcome was the rate of vaginal delivery. Secondary outcomes included the rates of active labor in 12 hours, vaginal delivery in 12 and 24 hours, mean duration of latent phase labour, and induction to vaginal delivery interval. Linear and logistic regression models were generated to identify factors independently associated with successful induction. Results: No ultrasound characteristic predicted primary or secondary outcomes. Bishop score, cervical position, and maternal age independently predicted vaginal delivery. Maternal weight, cervical dilatation, and effacement independently predicted active labor in 12 hours. Independent predictors of vaginal delivery in 12 hours were induction method, dilatation, gravidity, and maternal weight. Cervical effacement and parity independently predicted vaginal delivery in 24 hours. Maternal weight, cervical position, dilatation were independently associated with latent phase duration. Factors associated with induction to delivery interval were parity, effacement, and maternal weight. Conclusion: Transvaginal ultrasound does not predict successful labor induction in post term pregnancy as well as digital cervical examination.

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