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February 2, 2026Hong Kong Medical Journal0 citationsOpen Access

A ten-year evaluation of the incidence of obstetric anal sphincter injury with a reduced episiotomy rate

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YLYY LauTCTW ChauWTWC Tang

Key Points

  • To evaluate how the incidence of obstetric anal sphincter injury (OASIS) changed over ten years with varying episiotomy rates.
  • Longitudinal evaluation over ten years
  • Assessment of incidence rates in obstetric anal sphincter injury
  • Comparison between nulliparous and multiparous women
  • Analysis of vaginal and instrumental delivery cases
  • Episiotomy showed protective effects against OASIS in nulliparous women during both normal and instrumental deliveries.
  • In multiparous women, episiotomy reduced OASIS rates during instrumental deliveries but not during normal vaginal deliveries.

Abstract

Episiotomy was protective against OASIS among nulliparous women with singleton normal vaginal delivery and instrumental delivery in an Asian population. It also conferred protection among multiparous women undergoing instrumental delivery but not in those having normal vaginal delivery.

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Cite This Study

Lau et al. (2026) studied this question.

synapsesocial.com/papers/6980ff49c1c9540dea8121f8https://doi.org/10.12809/hkmj2512846
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Incidence and Independent Risk Factors for Obstetric Anal Sphincter Injuries: A Four-Year Retrospective Cohort Study from a UK Tertiary Maternity Unit2026
  2. 2Episiotomy is associated with a reduced risk of obstetric anal sphincter injury in nulliparous vacuum‐assisted deliveries, particularly in high‐risk cases2026 · 1 citations
  3. 3Variation in Episiotomy Use Among Nulliparous Individuals by Maternity Care Provider and Associated Rates of Obstetric Anal Sphincter Injury2024 · 15 citations
  4. 4Improvements in obstetric care: analysis of 18 years of real-world data on the reduction of obstetric anal sphincter injuries during instrumental deliveries2024
  5. 5Episiotomy and Obstetric Anal Sphincter Injury in the Setting of Instrumental Vaginal Birth: A Retrospective Cohort Study2026