Pollard J K, Leaphart W L, Braun T E, Capeless E L
Department of Obstetrics and Gynecology, University of Vermont, Burlington, USA.
Obstet Gynecol. 1996 May;87(5 Pt 2):822-3.
Entrapment of the aftercoming head after mentum anterior rotation is a life-threatening complication of vaginal breech delivery. Few options exist when rotation and flexion from this position cannot be performed successfully either transabdominally or with vaginal maneuvers.
A term primigravida presented with a singleton breech in advanced labor. The fetal torso and arms delivered vaginally, but the aftercoming head became extended and was entrapped in a mentum anterior position. The fetal head could not be rotated and flexed, either vaginally or transabdominally with suprapubic pressure. Laparotomy and hysterotomy were performed, and vaginal delivery of a live fetus was accomplished after rotation and flexion of the fetal head through this incision.
Hysterotomy is a safe and effective maneuver for delivery of the entrapped fetal head with mentum anterior rotation after standard procedures have failed.
颏前位旋转后胎头后出受阻是阴道臀位分娩的一种危及生命的并发症。当无法经腹或通过阴道手法成功地从此位置进行旋转和屈曲时，选择很少。
一名足月初产妇，单胎臀位，处于产程后期。胎儿躯干和手臂经阴道娩出，但后出胎头伸展并被困于颏前位。无论是经阴道还是经腹施加耻骨上压力，均无法使胎头旋转和屈曲。遂行剖腹术及子宫切开术，通过此切口将胎头旋转并屈曲后经阴道娩出一活婴。
在标准操作失败后，子宫切开术是娩出因颏前位旋转而受阻的胎头的一种安全有效的方法。
