TY - CHAP M1 - Book, Section TI - Postpartum Perineal Lacerations A1 - Dooley-Hash, Suzanne A1 - Knoop, Kevin J. A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason PY - 2021 T2 - The Atlas of Emergency Medicine, 5e AB - Lacerations to the perineum most commonly occur following a rapid, uncontrolled delivery of the fetal head. Postpartum perineal lacerations range from minor to severe. First-degree lacerations are limited to the mucosa, skin, superficial subcutaneous, and submucosal tissues. Second-degree lacerations penetrate deeper into the superficial fascia and transverse perineal musculature. Third-degree lacerations extend through deeper tissues and disrupt the anal sphincter, while fourth-degree lacerations extend through rectal mucosa. These injuries can be associated with significant maternal blood loss and multiple long-term complications. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/04/23 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1181041801 ER -