P291b: Induction of labour: cervical length measurement beside misoprostol or dinoproston?is it a reliable factor both for patients and their obstetrical team?

Abstract

The rate of pregnant women undergoing an induction of labour is increasing. Objective methods such as cervical length measurement may help to time the induction to delivery interval. The aim of the study was to compare preinduction cervical length with the prediction of a delivery within 24 hours with two different prostaglandins. Prospective randomised trial of misoprostol and dinoproston for induction of labour. Inclusion criteria were singleton pregnancy, gestational age 37—42 weeks, no previous caesarean section and signed informed consent. The study was approved by the local ethic committee. Assessment of cervical length by transvaginal ultrasound was performed immediately before induction. For statistical analysis the t-test (SPSS) were used. Preliminary 50 out of 100 women were included. Mean of parity (0.58), age, (31.1 y), gestational age (41.06), birthweight (3691 g) and cervical length (28.12 mm) were did not differ significantly in both groups. Vaginal delivery within 24 h occurred in the group with a cervical length of 0–28 mm in 69% (misoprostol) and in 35% (dinoproston). In the group with a cervical length of 29–50 mm, 54% (misoprostol) vs. 33% (dinoproston) delivered within 24 h. No significancy between any pair of these values was found. The value of 28 mm as a predictor for vaginal delivery within 24 hours after induction of labour with our preliminary data cannot yet be recommended. Misoprostol is more efficient than dinoproston and therefore the selection of the inducing agent is more important than the preinductional cervical length.