Mainly manifested as weak contraction of uterus and prolonged process of labor, it it liable to cause fetal distress, leading to cesarean section, postpartum hemorrhage, and puerperous complications. 主要临床表现为子宫收缩力弱,产程延长,对母婴均有不良影响,易导致发生胎儿宫内窘迫,手术产率增高,易引起产后出血,产褥期并发症亦增多。