我对50例过期妊娠进行B超监护，并在产后对胎盘，进行组织学，以探讨正确决定过期妊娠的分娩时机，现将有关资料报道如下。1资料与方法本组病例为我院产科门诊孕妇，随机抽样50例初孕过期妊娠者，从42孕周开始，每3～6天做一次B超检查，项目为：1）胎儿双项径。2）胎盘功能。3 I have 50 cases of obstetric overdue care, and in the postpartum of the placenta, histology, in order to explore the right to determine the timing of childbirth overdue pregnancy, the relevant information is reported below. 1 Materials and Methods The patients were obstetric outpatient pregnant women in our hospital, a random sample of 50 cases of first trimester pregnancy, from 42 gestational weeks, every 3 to 6 days to do a B-ultrasound, the project is: 1) fetal dual-path . 2) Placental function. 3