摘要 : Despite the great studies made in the reduction of pregnancy-related maternal mortality, hemorrhage remains a leading cause of maternal death. To further reduce the maternal mortality rate, the risk factors related to hemorrhage m... 展开 Despite the great studies made in the reduction of pregnancy-related maternal mortality, hemorrhage remains a leading cause of maternal death. To further reduce the maternal mortality rate, the risk factors related to hemorrhage must be identified. Some previous studies have identified prolonged labor, preeclampsia, macrosomia, induction and/or augmentation of labor, forceps delivery, retained placenta and soft-tissue lacerations as major risk factors for severe postpartum hemorrhage . However, these previous studies may have some limitations such as a bias of including multiple pregnancies. In deliveries of multiple pregnancies, overdistention of the uterus may weaken the contraction and retraction of the uterine muscles and increase the risk of postpartum hemorrhage. In this study, therefore, we examined vaginal singleton deliveries to identify factors most strongly associated with the increased risk of severe postpartum hemorrhage needing transfusion. 收起