Impact of mediolateral episiotomy on incidence of obstetrical anal sphincter injury diagnosed by endoanal ultrasound

to examine potential association between mediolateral episiotomy and reduced incidence of obstetrical anal sphincter injuries (OASIS) diagnosed by endoanal ultrasound.prospective cohort study.tertiary referral university hospital.sixty nulliparous women at 28-33 weeks of gestation with singleton pregnancies were included between 2010 and 2012.participants were examined with endoanal ultrasound at 28-33 weeks gestation and at 6-7 weeks...