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OASI: a preventable injury?

Habiba Kapaya1, Sharifah Hashim1, Swati Jha1

  • 1Department of Urogynaecology, Level 4 Jessop Wing, Sheffield Teaching Hospitals, NHS Trust, Tree Root Walk, Sheffield S10 2SF, United Kingdom.

European Journal of Obstetrics, Gynecology, and Reproductive Biology
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

Obstetric anal sphincter injury (OASI) is linked to primiparity, episiotomy, and larger fetal weight. Gestational age and episiotomy are modifiable risk factors for OASI.

Keywords:
EpisiotomyInstrumental deliveryOASIRisk factors

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Area of Science:

  • Obstetrics and Gynecology
  • Maternal-Fetal Medicine
  • Epidemiology

Background:

  • Obstetric anal sphincter injury (OASI) is a significant complication of childbirth.
  • Identifying risk factors for OASI is crucial for developing preventive strategies.
  • Understanding modifiable factors can guide clinical practice and improve patient outcomes.

Purpose of the Study:

  • To determine risk factors associated with obstetric anal sphincter injury (OASI).
  • To investigate whether identified risk factors for OASI are modifiable.

Main Methods:

  • Retrospective review of 2572 women over a 10-year period at a university teaching hospital.
  • Analysis of maternal (age, parity, BMI, ethnicity), obstetric (gestational age, delivery assistance, episiotomy), and fetal (weight) factors using logistic regression.
  • Univariate and multivariate analyses were performed, comparing cases of OASI with controls.

Main Results:

  • Strong associations with OASI included primiparity (OR 9.8), episiotomy (OR 8.6), gestational age > 41 weeks (OR 1.5), fetal weight > 4 kg (OR 3.2), and Asian ethnicity (OR 1.9).
  • Instrumental delivery was also a significant risk factor.
  • A raised BMI (>30) showed a protective effect (OR 0.4).

Conclusions:

  • While many risk factors for OASI are non-modifiable, gestational age and episiotomy represent modifiable factors.
  • Clinical attention to gestational age and episiotomy practices may help reduce OASI incidence.
  • Further research into the protective effect of higher BMI could offer new insights.