未足月胎膜早破在所有妊娠中的发生率为1%~3%〔1,2〕,约占早产的30%~40%。未足月胎膜早破可引起早产、脐带脱垂、宫内感染、胎儿窘迫等不良结局。因此,根据孕周、破膜时间、胎儿情况等选择适当的分娩方式以及处理好分娩过程的各个环节可减少各种因素对胎儿及新生儿的损伤,降低 Premature rupture of membranes in all pregnancies in the incidence of 1% to 3% 〔1,2〕, accounting for 30% to 40% of preterm birth. Premature rupture of membranes can cause premature rupture of membranes, umbilical cord prolapse, intrauterine infection, fetal distress and other adverse outcomes. Therefore, according to gestational age, rupture time, the fetus, etc. choose the appropriate mode of delivery and to deal with all aspects of the delivery process can reduce various factors on the fetus and newborn injury, reduce