产后出血是产妇死亡四大原因之一。我院1984年1月至1986年四月共有头位难产505例,其中发生产后出血81例,现将其产后出血原因分析如下: 出血标准:我院产后24小时内出血总量≥400ml定为产后出血。出血原因及预防:本文头位难产产后出血发生率16.04%,是正常分娩产后出血发生 Postpartum hemorrhage is one of the four major causes of maternal death. Our hospital from January 1984 to April 1986 a total of head of dystocia 505 cases, of which 81 cases of postpartum hemorrhage occurred, and now the causes of postpartum hemorrhage are as follows: Bleeding standard: within 24 hours after delivery in our hospital for bleeding ≥ 400ml postpartum Bleeding. Hemorrhage causes and prevention: This article first hard bleeding after the birth rate of 16.04%, is the normal delivery of postpartum hemorrhage occurred