Result: Hypamnion mostly happened 40 weeks later.
结果：羊水过少高发于40周后。
Hypamnion; Pathogenic factors; Perinatal prognosis; Delivery mode.
羊水过少；发病因素；围产儿预后；分娩方式。
Method:Using retrospectively analysis method and doing the comparative analysis between the 102 cases of hypamnion group and 100 cases normal amniotic fluid group.
方法：采用回顾性分析方法，对羊水过少组102例和羊水正常组100例进行对比分析。
Results:The former needed less time, and complemented retention of placenta and fatal membranes, hypamnion of late pragracy, dead fetus, failure of induction developed in induction by rivanolum.
结果：米非司酮加米索前列醇引产时间短，且对雷凡诺引产中出现的胎盘胎膜滞留和晚期妊娠羊水少、死胎、引产失败等均具有较好的互补作用。
Results:The former needed less time, and complemented retention of placenta and fatal membranes, hypamnion of late pragracy, dead fetus, failure of induction developed in induction by rivanolum.
结果：米非司酮加米索前列醇引产时间短，且对雷凡诺引产中出现的胎盘胎膜滞留和晚期妊娠羊水少、死胎、引产失败等均具有较好的互补作用。
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