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Obstetric events leading to anal sphincter damage
V Donnelly1, M Fynes, D Campbell
1Department of Obstetrics and Gynaecology, University College Dublin, National Maternity Hospital, Ireland.
Obstetrics and Gynecology
|December 5, 1998
Summary
Instrumental delivery and prolonged second stage of labor with epidural analgesia significantly increase the risk of anal sphincter injury in first-time vaginal births. These factors are key to preventing postpartum anal incontinence.
Area of Science:
- Obstetrics
- Gynecology
- Pelvic Floor Disorders
Background:
- Anal sphincter injury can lead to long-term fecal incontinence, impacting quality of life.
- Identifying obstetric risk factors is crucial for prevention strategies in primiparous women.
Purpose of the Study:
- To prospectively identify obstetric factors associated with anal sphincter injury during first vaginal delivery.
- To assess the relationship between delivery interventions and postpartum anal function.
Main Methods:
- Prospective cohort study of 184 primiparous women.
- Bowel function questionnaires, anal manometry, pudendal nerve conduction latency, and anal endosonography were used.
- Data collected pre- and post-delivery (6 weeks).
Main Results:
- Instrumental delivery increased anal sphincter injury risk 8.1-fold and symptoms 7.2-fold.
- Second stage of labor >60 minutes increased injury risk 1.7-fold and symptoms 1.6-fold.
- Epidural analgesia prolonged labor and increased injury risk 2.1-fold and symptoms 2.0-fold.
Conclusions:
- Instrumental delivery is a major risk factor for anal sphincter injury.
- Prolonged second stage of labor, often due to epidural analgesia, significantly elevates injury risk.
- These obstetric factors are critical for preventing anal sphincter damage in primiparous vaginal births.
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