产后出血是产科常见而又严重并发症之一，是引起产妇死亡四大疾病中的首要原因。产后出血最常见的原因是于它收缩乏力性出血，约占产后出血总数的70％－75％，亦有报道高达叨％者。可见预防和治疗产后于官收缩乏力性出血是非常重要的。l产后富结乏力性出血的原因任何影响子宫肌 Postpartum hemorrhage is one of the common and serious complications of obstetrics, and is the leading cause of the four major diseases that cause maternal death. Postpartum hemorrhage is the most common cause of it in the contraction of fatigue bleeding, accounting for about 70% -75% of the total number of postpartum hemorrhage, has also been reported up to 40%. Shows that the prevention and treatment of postpartum rupture in the official bleeding is very important. l postpartum knot-rich bleeding any cause of any effect on the uterine muscle