Thorp J M, Bowes W A, Brame R G, Cefalo R
Obstet Gynecol. 1987 Aug;70(2):260-2.
A prospective, nonrandomized controlled study was performed to determine the effect of using midline episiotomy only for mothers who experienced fetal distress and/or operative vaginal delivery. Such a policy resulted in a significant decline in third- and fourth-degree lacerations in nulliparous women. This reduction was most pronounced in nulliparous women delivering infants larger than 3400 g. No third- or fourth-degree laceration occurred without antecedent episiotomy in any woman. A policy of using episiotomy selectively appears to lower the incidence of perineal trauma.
进行了一项前瞻性、非随机对照研究，以确定仅对出现胎儿窘迫和/或阴道助产的母亲实施会阴正中切开术的效果。这样的政策导致初产妇三度和四度会阴裂伤显著减少。这种减少在分娩体重超过3400克婴儿的初产妇中最为明显。在任何女性中，没有先行会阴切开术就不会发生三度或四度会阴裂伤。选择性使用会阴切开术的政策似乎能降低会阴创伤的发生率。
