Results The blood losing was increased with pregnancy weeks and incidence of postpartum of 9% that including placenta remain and soft birth canal injury.

结果失血情况随孕周增加、失血量增多。 产后病率9% ，包括胎盘残留及软产道损伤等。

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Result Uterine inertia in 12 cases (63.1%), placental factor 5 cases (26.3%), soft birth canal injury factors, 1 case (5.3%), coagulation dysfunction in 1 case (5.3%).

结果宫缩乏力12例（63.1%），胎盘因素5例（26.3%），软产道损伤因素1例（5.3%），凝血功能障碍1例（5.3%）。

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