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#22946

Which vaginal birth method, water or bed delivery, decreases the risk for obstetric anal sphincter injuries (OASIS)? Is immersion in water a good idea to prevent OASIS? Zachariah R1, Forst S1, Geissbühler V2 1. Kantonsspital Winterthur, Switzerland, 2. Claraspital Basel, Switzerland KEYWORDS: Pelvic Floor, Female, Anal Incontinence Water delivery has become a popular alternative birthing method with objective and subjective advantages, such as less episiotomies, less use of analgetics and a better birthing experience. Interpretations of existing data vary widely (1) (2). Perineal injuries and their prevention are a big issue in the context of vaginal deliveries. In particular, obstetric anal sphincter injuries (OASIS) are feared, because of the increased risk of fecal incontinence, perineal pain and dyspareunia, which may persist and reduce quality of life. Primiparae are known to have the highest risk for OASIS. The use of warm compresses on the perineum in the second stage of labor reduces the rate of OASIS. Immersion and delivery in water might have a similar effect on the perineum by providing pressure relief. Data concerning the risk of OASIS in water are controversial (3). The aim of this study is to compare OASIS after water and bed delivery by primiparae. Our hypothesis: primiparae, with identical management, have the same rates of OASIS after water and bed delivery.