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Updated: Aug 12, 2026
03:49
Anogenital Distance and Perineal Measurements of the Pelvic Organ Prolapse (POP) Quantification System
Published on: September 20, 2018
Risk factors for third degree perineal ruptures during delivery
J W de Leeuw1, P C Struijk, M E Vierhout
1Department of Obstetrics and Gynaecology, Ikazia Hospital, The Netherlands.
Summary
Mediolateral episiotomy significantly reduces third-degree perineal tears during vaginal delivery, preventing anal sphincter damage. Forceps delivery poses a higher risk than vacuum extraction for these severe tears.
Area of Science:
- Obstetrics and Gynecology
- Perinatology
- Surgical Safety
Background:
- Third-degree perineal tears, involving anal sphincter damage, are a significant complication of vaginal delivery.
- Risk factors and preventative measures for severe perineal trauma require further investigation to improve maternal outcomes.
Purpose of the Study:
- To identify risk factors associated with third-degree perineal tears during vaginal delivery.
- To evaluate the protective effect of mediolateral episiotomy and compare risks of assisted vaginal delivery instruments.
Main Methods:
- A population-based observational study analyzed 284,783 vaginal deliveries from the Dutch National Obstetric Database (1994-1995).
- Logistic regression was employed to determine risk factors for third-degree perineal ruptures, defined as anal sphincter involvement.
Main Results:
- High fetal birth weight, prolonged second stage of labor, and primiparity were linked to increased risk of anal sphincter damage.
- Mediolateral episiotomy demonstrated strong protective effects (OR: 0.21), while forceps delivery significantly increased risk (OR: 3.33) compared to vacuum extraction.
- All assisted vaginal deliveries elevated the risk of third-degree tears, with combined instrument use further increasing risk.
Conclusions:
- Mediolateral episiotomy is a highly effective preventive measure against third-degree perineal ruptures and subsequent fecal incontinence.
- Forceps delivery presents a greater risk for severe perineal tears than vacuum extraction; vacuum extraction is preferred when feasible to minimize anal sphincter injury.
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