产后出血是指胎儿娩出后24小时内阴道出血达400ml以上而言的。多发生在产后2小时内。如果分娩24小时后在产褥期之内发生阴道大量流血称为晚期产后出血,此种出血较少发生。产后出血的原因以子宫收缩乏力为最常见,还有产道裂伤、胎盘滞留及凝血功能障碍。预防和处理要针对发生的原因。对有可能要发生产后出血的产妇要提前注意,产后立即给予预防性处理。如双 Postpartum hemorrhage refers to the fetus within 24 hours after vaginal bleeding up to 400ml in terms of terms. Occurred within 2 hours after delivery. If a large amount of vaginal bleeding occurs within 24 hours after delivery in the puerperium, it is called late postpartum hemorrhage, which is less likely to occur. Causes of postpartum hemorrhage uterine atony is the most common, as well as birth canal laceration, placental retention and coagulation disorders. Prevention and treatment should be for the reasons. Preterm postpartum hemorrhage may have to pay attention to the issue of prenatal and postnatal prophylactic treatment. As double