Induction du travail après une version par manœuvres externes pour siège réussie : un sur-risque de césarienne?

To assess the effect of successful external cephalic version (ECV) on the risk of caesarean section (CS) during attempted vaginal delivery after induction of labour.

A unicentric matched retrospective observational case-control cohort study with exposed and unexposed groups. All pregnant women who had an induction of labour after a successful external cephalic version (sECV) between 1998 and 2016 were included. A total of 88 cases were compared with 176 controls (spontaneous cephalic presentation), matching for the year of delivery, parity, gestational age, indication and mode of induction of labour. The main outcome measure was the risk of caesarean. A univariate analysis and a multivariate logistic regression analysis were performed.

The caesarean section rate was significantly higher after sECV (22% versus 13.1%; p = 0.039) especially for postdate pregnancy (55% versus 8.2%; p <0.05). For the univariate analysis, age (31 years and 4 months versus 24 years and 6 months; p <0.01) and maximal speed of oxytocin infusion (72 ml/h versus 68 ml/h; p = 0.04) were higher in the case group. The multivariate analysis showed that the risk of caesarean section was significantly increased after an sECV (aOR 1.946; 95% CI 1.017-3.772) and after the use of prostaglandins for ripening (aOR 1.951; 95% CI 1.097-3.468), and decreased for multipara (aOR 0.208; 95% CI 0.114-0.377).

Women who have a successful ECV are at increased risk of caesarean section after subsequent induction of labour.