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产后出血是分娩期严重并发症,居导致我国产妇死亡原因的首位,其发病率占分娩总数的2%～3%,由于分娩时出血量收集和测量存在一定的困难,估计出血量偏少,实际产后出血发病率更高〔1〕。导致产妇出血的机理是子宫胎盘附着处血窦不能闭合,因此,胎儿娩出和羊水流出后子宫腔体积快速缩小,释放宫内胎盘中脐血使子宫腔体积进一步缩小,肌纤维缩复,有利于肌壁间血窦闭合,减少产时出血量,降
Postpartum hemorrhage is a serious complication of childbirth, leading to the leading cause of maternal death in China, the incidence of 2% to 3% of the total number of deliveries, due to the collection and measurement of bleeding during childbirth there are some difficulties in estimating the amount of bleeding less than normal, The actual incidence of postpartum hemorrhage higher 〔1〕. The mechanism leading to maternal hemorrhage is that uterine placenta attached to the sinus can not be closed, therefore, the fetus after delivery and amniotic fluid volume of uterine cavity after the rapid reduction of intrauterine placenta release of uterine cavity volume to further reduce the volume of the uterine cavity, muscle fiber contraction, is conducive to muscle Wall sinus closed, reducing the amount of bleeding during delivery, down