产后出血是产科最常见和最危险的并发症,为目前我国孕产妇死亡的最主要原因[1],而宫缩乏力是产后出血的主要原因,有文献报道,由宫缩乏力引起产后出血者占60.95%,防治的关键是宫缩剂的使用。临床工作中往往对产后出血量估计不足,延误诊断、治疗,失去最佳抢救时机,所以预防产后出 Postpartum hemorrhage is the most common and most dangerous complication of obstetrics, maternal mortality is the most important reason for the current [1], and uterine inertia is the main reason for postpartum hemorrhage, it has been reported in the literature, due to uterine inertia caused by postpartum hemorrhage Accounting for 60.95%, prevention and treatment of the key is the use of contractions. Clinical work is often underestimated the amount of postpartum hemorrhage, delay diagnosis, treatment, loss of the best time to rescue, so to prevent postpartum