胎儿娩出后24小时内,产妇出血量超过500ml者称为产后出血,其发生在2小时内者占80%以上;分娩24小时以后大出血者称为晚期产后出血。产后出血是分娩期的严重并发症,居我国目前孕产妇死亡原因的首位。产后出血的预后随失血量、失血速度及产妇体质不同而异。若短时内大量失血,可迅速发生失血性休克,严重者危及产妇生命。休克时 24 hours after delivery of the fetus, the amount of maternal bleeding more than 500ml known as postpartum hemorrhage, which occurred within 2 hours accounted for more than 80%; 24 hours after delivery of bleeding as late postpartum hemorrhage. Postpartum hemorrhage is a serious complication of childbirth, ranking the first cause of maternal death in China. The prognosis of postpartum hemorrhage with blood loss, blood loss and maternal physical differences vary. If a large number of short-term blood loss, hemorrhagic shock can occur rapidly, in serious cases endangering the lives of mothers. Shock