Results The blood losing was increased with pregnancy weeks and incidence of postpartum of 9% that including placenta remain and softbirthcanal 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。
2
Result Uterine inertia in 12 cases (63.1%), placental factor 5 cases (26.3%), softbirthcanal injury factors, 1 case (5.3%), coagulation dysfunction in 1 case (5.3%).
The observation group fetal childbirth time is short, the soft the birthcanal, postpartum blood loss was less damage number fewer days in hospital and short.