盆;The main causes of dystocia of vertex presentation were occiput malpresentation, macrosomic infant, uterine atony, abnormal pelvic and genital tract.
导致头位难产的主要因素依次为胎头位置异常、巨大儿、宫缩乏力、软产道及
产道异常。
；后头The main causes of dystocia of vertex presentation were occiput malpresentation, macrosomic infant, uterine atony, abnormal pelvic and genital tract.
导致头位难产的主要因素依次为胎头位置异常、巨大儿、宫缩乏力、软产道及产道异常。
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