Lateral episiotomy or no episiotomy in vacuum assisted delivery in nulliparous women (EVA) : multicentre, open label, randomised controlled trial
OBJECTIVE: To assess the effect of lateral episiotomy, compared with no episiotomy, on obstetric anal sphincter injury in nulliparous women requiring vacuum extraction.DESIGN: A multicentre, open label, randomised controlled trial.SETTING: Eight hospitals in Sweden, 2017-23.PARTICIPANTS: 717 nulliparous women with a single live fetus of 34 gestational weeks or more, requiring vacuum extraction wer