Observational studyActa obstetricia et gynecologica Scandinavica2022
Obstetric anal sphincter injuries-Maternal, fetal and sociodemographic risk factors: A retrospective register-based study.
Observational study in Acta obstetricia et gynecologica Scandinavica, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.
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Who cites it
17 citing papers in PubMed, 22 citations in OpenAlex.
- Obstetric Anal Sphincter Injury After Episiometer-Guided Versus Conventional Episiotomy in Instrumental Deliveries: A Randomized Controlled Trial.International urogynecology journal · 2024Trial
- The impact of advanced maternal age on the risk of perineal and anal sphincter injuries in nulliparous women.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026Article
- IUGA International Guidelines on Obstetric Anal Sphincter Injuries.International urogynecology journal · 2026Article
- Prediction Model and Novel Classification System for Complications after Minimally Invasive Hysterectomy.Gynecologic and obstetric investigation · 2026Article
- Impact of gestational weight gain on perineal injury and obstetric anal sphincter injury among underweight primiparous women.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026Article
- Is amniotomy a risk factor for severe perineal trauma? -A Swedish nationwide register study.BMC pregnancy and childbirth · 2026Article
- The role of fetal viability in perineal and anal sphincter injury: Insights from a large cohort study.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026Article
- The Impact of Midwife Experience and Time of Birth on the Risk of Obstetric Anal Sphincter Injuries (OASIS).Birth (Berkeley, Calif.) · 2026Article
- Subpubic arch angle and occult obstetric anal spincter injury in primiparous women: a prospective observational study.Scientific reports · 2026Observational
- Obstetric Anal Sphincter Injuries: Risk Factors, Pelvic Floor Dysfunction, and Quality of Life Outcomes.Medicina (Kaunas, Lithuania) · 2026Article
- Effects of Obstetric Anal Sphincter Injuries (OASIS) on Incidence of Urinary and Anal Incontinence After Childbirth in Nigeria: A Prospective Cohort Study.International urogynecology journal · 2026Article
- Impact of gestational weight gain on perineal injury in overweight and obese primiparous women.Archives of gynecology and obstetrics · 2026Article
- Article
- Mode of delivery and maternal outcome in subsequent delivery after an obstetric anal sphincter injury: a Finnish retrospective cohort study.BMC pregnancy and childbirth · 2025Article
- Mediolateral episiotomy and obstetric anal sphincter injuries in nullipara: a propensity score matching study.BMC pregnancy and childbirth · 2025Article
- Short stature and vaginal dinoprostone as independent predictors of composite maternal-newborn adverse outcomes in induction of labor after one previous cesarean: a retrospective cohort study.BMC pregnancy and childbirth · 2024Article
- Obstetric anal sphincter injuries-Maternal, fetal and sociodemographic risk factors: A retrospective register-based study.Acta obstetricia et gynecologica Scandinavica · 2022Observational
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionObstetric anal sphincter injuries (OASIS) are severe complications to vaginal births with potentially serious long-term consequences and large impact on quality of life. The aim was to determine risk and protective factors for OASIS. MATERIAL AND
methodsWe performed a retrospective register-based observational study. A cohort of 988 988 singleton term deliveries 2005-2016 in Sweden were included. Data from the Swedish Medical Birth Registry and Statistics Sweden were extracted to identify cases of OASIS and maternal and fetal characteristics. Modified Poisson Regression analyses were performed to assess risk factors.
resultsThe rate of OASIS was 3.5% (n = 34 583). Primiparity (adjusted risk ratio [aRR] 3.13, 95% CI 3.05-3.21), vacuum extraction (aRR 2.79, 95% CI 2.73-2.86), forceps (aRR 4.27, 95% CI 3.86-4.72), and high birthweight (aRR 2.61, 95% CI 2.50-2.72) were associated with a significantly increased risk of OASIS. Increasing maternal age and decreasing maternal height also increased the risk of OASIS. Obesity increased the risk of OASIS (aRR 1.04, 95% CI 1.04-1.08), if fetal birthweight was not adjusted for. Smoking (aRR 0.74, 95% CI 0.70-0.79) and low maternal education (aRR 0.87, 95% CI 0.83-0.92) were associated with a decreased frequency of reported OASIS. Previous cesarean section increased the risk of OASIS (aRR 1.41, 95% CI 1.36-1.47).
conclusionsPrimiparity, instrumental delivery, and high birthweight significantly increased the risk of OASIS. Obesity, low height, increasing age, and previous cesarean section also increased the risk whereas smoking and low maternal educational level were associated with a lower OASIS rate.
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