Evaluation of the incision angle of mediolateral episiotomy at 60 degrees

Objective: To study the angle of mediolateral episiotomy at the time of cut, after primary repair, and 6 months postpartum; and the incidence and severity of perineal pain and anal incontinence 6 months after delivery.

Methods: The study group comprised 60 consecutively recruited primiparous women who required episiotomy during delivery assisted by 2 obstetricians. The incision angle of episiotomy (defined as 60°) was measured before cutting, after primary repair, and after 6 months. At follow-up, perineal pain was evaluated by a verbal rating score; anal incontinence was assessed by St Mark's score.

Results: The angles differed significantly among the incision (60°), repair (45°), and 6-month (48°) measurements (P < 0.001). There was a poor correlation between the suture angle and the angle measured at 6 months postpartum. No severe perineal tear was diagnosed in the cohort. At 6 months postpartum, only 1 woman reported mild symptoms of de novo anal incontinence, whereas 7 women reported perineal pain related to episiotomy.

Conclusion: An incision angle of mediolateral episiotomy of 60° resulted in a low incidence of anal sphincter tearing, anal incontinence and perineal pain. A randomized controlled trial is needed to assess the outcome when different angles of episiotomy are used.