Influence of previous delivery mode on perineal trauma risk.

Objective: To evaluate the impact of a previous pregnancy and delivery on perineal trauma rates in the subsequent vaginal birth.

Methods: Retrospective cohort study. The perineal outcomes of secundiparous women with history of previous (first) delivery in one of three categories: failed operative vaginal delivery (FOVD) and second-stage emergency cesarean section (EmCS); elective cesarean section (ElCS), and vaginal delivery (VD) with intact perineum, were compared with a control primiparous group.