Risk factors for sonographic internal anal sphincter gaps 6-12 months after delivery complicated by anal sphincter tear

Academic Article


  • Objective: The objective of the study was to identify risk factors for internal anal sphincter (IAS) gaps on postpartum endoanal ultrasound in women with obstetric anal sphincter tear. Study Design: This prospective study included 106 women from the Childbirth and Pelvic Symptoms Imaging Supplementary Study who had third- or fourth-degree perineal laceration at delivery and endoanal ultrasound 6-12 months postpartum. Data were analyzed using Fisher's exact and t tests and logistic regression. Results: Mean (± SD) age was 27.7 (± 6.2) years. Seventy-nine women (76%) were white and 22 (21%) black. Thirty-seven (35%) had sonographic IAS gaps. Risk factors for gaps included fourth- vs third-degree perineal laceration (odds ratio [OR] 15.4, 95% confidence interval [CI] 4.8, 50) and episiotomy (OR 3.3, 95% CI 1.2, 9.1). Black race (OR 0.23, 95% CI 0.05, 0.96) was protective. Conclusion: In women with obstetric anal sphincter repairs, fourth-degree tears and episiotomy are associated with more frequent sonographic IAS gaps. © 2007 Mosby, Inc. All rights reserved.
  • Authors

    Digital Object Identifier (doi)

    Author List

  • Bradley CS; Richter HE; Gutman RE; Brown MB; Whitehead WE; Fine PM; Hakim C; Harford F; Weber AM
  • Start Page

  • 310.e1
  • End Page

  • 310.e5
  • Volume

  • 197
  • Issue

  • 3