What are the factors that may predict the severity of perineal tears in obstetric anal sphincter injuries and how are their outcomes? A 10-year retrospective analysis in a Southeast Asian population.

Introduction And Hypothesis: Obstetric anal sphincter injuries (OASIS) complicate around 1-2% of deliveries in low- and middle-income countries. Asians are twice more likely to suffer this complication. The 3c and 4th-degree perineal tears that involve the internal anal sphincter muscle and the anal mucosa have been reported to have a poorer outcome and higher risk of recurrence compared to less severe tears.