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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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