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Related Concept Videos

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Related Experiment Video

Updated: Jul 11, 2026

Quantification of Levator Ani Hiatus Enlargement by Magnetic Resonance Imaging in Males and Females with Pelvic Organ Prolapse
07:41

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Disturbed anal sphincter function following vaginal delivery

J M Wynne1, J L Myles, I Jones

  • 1University Department of Obstetrics and Gynaecology, Mater Hospital, South Brisbane, Australia.

Gut
|July 1, 1996
PubMed
Summary

The first vaginal delivery permanently lowers resting anal pressures. This study evaluated the impact of childbirth on internal sphincter function, finding lasting effects even after recovery periods.

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Area of Science:

  • Obstetrics and Gynecology
  • Gastroenterology
  • Pelvic Floor Disorders

Background:

  • Idiopathic fecal incontinence research has shifted focus to the internal anal sphincter.
  • Understanding the impact of childbirth on anal sphincter function is crucial.

Purpose of the Study:

  • To investigate the effects of vaginal delivery on internal anal sphincter pressures.
  • To assess long-term changes in sphincter function following childbirth.

Main Methods:

  • Sphincter pressures were measured in 1202 mothers antenatally and postnatally.
  • Follow-up measurements were taken six to 10 weeks after delivery in selected patients.

Main Results:

  • Vaginal deliveries, particularly the first, significantly lowered resting anal pressures compared to antenatal values.
  • Primiparous women and those with spontaneous vaginal deliveries showed reduced pressures.
  • While some recovery occurred, pressures remained lower six to 10 weeks postpartum.

Conclusions:

  • The first vaginal delivery results in a permanent reduction in resting anal pressures.
  • Childbirth is a significant factor in altered internal sphincter function.
  • Further research is needed to explore the mechanisms behind this persistent pressure reduction.