D. the fetus should be evaluated with heart rate monitoring because PROM increases the risk of umbilical cordprolapse and fetal distress caused by oligohydramnios.
因为胎膜早破可致羊水过少从而增加脐带脱垂和胎儿窘迫的危险，故应做胎心监测观察胎儿情况。
2
Objective:To analyze the causes, clinical findings, labor management, way of delivery, and perinatal prognosis of revealed prolapse of umbilical cord.
目的：观察分析显性脐带脱垂的原因、临床表现、产程处理、分娩方式的选择及围产儿的预后。
3
The rates of umbilical cordprolapse and neonatal asphyxia have no obvious difference and statistically significant.