Warkentin B
Geburtshilfe Frauenheilkd. 1983 Mar;43(3):171-3. doi: 10.1055/s-2008-1037081.
Among 8739 deliveries premature rupture of the membranes was noticed in 1.792 cases. The premature rupture of the membranes occurred mostly during the night. During the 8 hours of the night from 2200-0600 hours the membranes ruptured more frequently than during the 16 hours of the day. One would expect that the forewaters break more readily during the daytime because of the upright position, the orthostatic pressure and some shock phenomena. The observed lower incidence of premature rupture of the membranes during the day is explained by protective mechanism which occur like a valve in the upright position.
在8739例分娩中，发现胎膜早破1792例。胎膜早破大多发生在夜间。在夜间22:00至次日06:00的8小时内，胎膜破裂比白天的16小时更频繁。人们可能会认为，由于直立姿势、体位性低血压和一些冲击现象，前羊水在白天更容易破裂。而观察到的白天胎膜早破发生率较低，是由像阀门一样在直立姿势下起作用的保护机制所解释的。
