E-Posters-The Relationship Between Levator Ani Muscle Avulsion and Obstetric Anal Sphincter Injury

The Relationship Between Levator Ani Muscle Avulsion and Obstetric Anal Sphincter Injury - Symphorosa Shing Chee Chan, MD

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This study aimed to investigate the association between levator ani muscle (LAM) avulsion and obstetric anal sphincter injury (OASIS) in primiparous women. The study included a total of 478 women who had given birth vaginally. Demographics and delivery data were collected from medical notes, and perineal and endoanal ultrasounds were performed 6-12 months after delivery.<br /><br />The prevalence of LAM avulsion was found to be 14.8%, 18.2%, and 45.1% in the normal vaginal delivery, ventous extraction, and forceps delivery groups, respectively. The prevalence of OASIS was 8.5%, 5.6%, and 5.8% in the three delivery groups, respectively. Overall, 7.1% of women without LAM avulsion had OASIS, while 4.2% of women with LAM avulsion had OASIS. However, there was no statistically significant association between LAM avulsion and OASIS.<br /><br />The study also analyzed demographic and delivery data and found no significant differences in age, epidural analgesia, and obstetric anal sphincter injury among the different delivery groups. However, the duration of the second stage of labor, gestation at delivery, birth weight, and body mass index differed significantly among the groups.<br /><br />In conclusion, this study did not find any association between LAM avulsion and OASIS. This suggests that LAM avulsion may not be a significant risk factor for OASIS in primiparous women. No disclosures were reported.<br /><br />References:<br />1. Chan SS, Cheung RY, Yiu AK, et al. Prevalence of levator ani muscle injury in Chinese primiparous women after first delivery. Ultrasound Obstet Gynecol. 2012;39:704-709.<br />2. Chung MY, Wan OY, Cheung RY, et al. The prevalence of levator ani muscle injury and health-related quality of life in primiparous Chinese women after instrumental deliveries. Ultrasound Obstet Gynecol. 2015;45:728-733.<br />3. Kwok SPK, Wan OYK, Cheung RYK, et al. The prevalence of obstetric anal sphincter injury following vaginal delivery in primiparous women. Hong Kong Med J. 2019;25:271-278.

Keywords

levator ani muscle avulsion

obstetric anal sphincter injury

primiparous women

vaginal delivery

ventous extraction

forceps delivery

prevalence

perineal ultrasound

endoanal ultrasound

association