产后出血是目前产科严重的并发症及孕产妇死亡的主要原因之一,其中有90%的病例是由宫缩乏力引起[1]。因此积极预防宫缩乏力性出血是降低孕产妇死亡的关键。如有妊娠高血压综合征、羊水过多、妊娠期胆汁淤积症等并发症的产妇存在着不同程度的子宫肌纤维过度伸展、子宫张力过大, Postpartum hemorrhage is currently one of the major causes of obstetric gynecological complications and maternal mortality, of which 90% are caused by uterine atony [1]. Therefore, active prevention of uterine inertia bleeding is the key to reducing maternal mortality. If pregnancy-induced hypertension syndrome, polyhydramnios, complications of pregnancy during pregnancy cholestasis exist varying degrees of uterine muscle fiber over-stretched, uterine tension is too large,