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在临产前服膜即破裂的称为服膜早破。临床上把从早破膜至规律性宫缩开始的时间称为隐匿期。胎膜早破与头位难产的关系密切，胎膜早破者头位难产发生率为65．43％，而且胎膜早被发生的越早，隐匿期越长，头位难产的发生率就越高。足月妊娠胎膜早破者，75％在破膜后24h内自然临产
In prenatal service film rupture called premature rupture of membranes. Clinically from the rupture of membranes to the beginning of regular contractions called the hidden period. Premature rupture of membranes and head dystocia closely related to premature rupture of membranes in the first bit of dystocia incidence was 65.43%, and the sooner the premature rupture of membranes, the longer the imprisonment, the first bit of the incidence of dystocia The higher. Full-term pregnancy rupture of membranes, 75% of natural rupture within 24h after rupture of membranes