Influence of prenatal urinary incontinence and mode of delivery in postnatal urinary incontinence: A systematic review and meta-analysis

International audienceBackground: It is likely that the pathophysiology of urinary incontinence (UI) differs between women who are incontinent before the first delivery and those whose incontinence occurs after. In this systematic review, we aimed to assess the association between the mode of delivery and the risk of postpartum UI in primiparous women with and without prenatal UI. Methods: We searched MEDLINE, Cochrane, Web of Science, Embase and CINHAL databases. Prospective studies including primiparous women during their pregnancy with a comparison of the rate of postpartum UI in women who underwent cesarean delivery or vaginal delivery according to continence status before delivery were included. The Risk Ratio (RR) was calculated with a 95% confidence interval (95% CI) using the total number of events and patients extracted from the individual studies. A subgroup comparison analysed the potential influence of women's prenatal continence status. Heterogeneity was estimated using I² statistics. Results: The risk of postpartum UI was significantly higher after vaginal delivery than after cesarean section (RR 1.80, 95% CI 1.48- 2.18). According to the subgroup test, the postpartum UI risk following a vaginal delivery, compared to cesarean section, was significantly higher in the subgroup of continent women during pregnancy (RR 2.57, 95% CI 2.17–3.04) than in the subgroup of incontinent pregnant women (1.56, 95% CI 1.27–1.92). Conclusions: The effect of a cesarean section in preventing postpartum UI appears controversial, particularly in women with prenatal UI