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对过期妊娠不同时间，即妊娠40周、41周实行计划分娩，并与同期过期妊娠进行结果比较：剖宫产率，妊娠40周为14．28％，41周为30.7％,过期妊娠为62％；胎儿宫内窘迫率，妊娠40周为4．76％，41周为15．38％，过期妊娠为50％；新生儿呼吸道并发症：妊娠40周为0．59％,41周为1．64％，过期妊娠6.00％；新生儿死亡率，妊娠40周为0．59％,41周为1．09％,过期妊娠为3.00％.随着孕龄增加，剖宫产率、胎儿宫内窘迫率及新生儿呼吸道并发症、新生儿死亡率均有增高，并且有显著差异（P＜0．05）．结果提示：在妊娠40周时胎盘尚未老化，母婴未受到危害时应及时终止妊娠，具有一定重要意义．
Planned delivery at 41 and 40 weeks of gestation was performed at different times of pregnancy, ie 40 and 41 weeks of gestation. Results of cesarean section rates were 14.28% at 40 weeks of gestation, 30.7% at 41 weeks and 62 %; Fetus intrauterine distress rate of 4.76% at 40 weeks of gestation, 15.38% at 41 weeks, 50% of overdue pregnancy; neonatal respiratory complications: 40 weeks of pregnancy was 0.59%, 41 weeks was 1 .64%, 6.00% of overdue pregnancy; neonatal mortality, 0.59% at 40 weeks of gestation, 1.09% at 41 weeks, 3.00% of overdue pregnancy. With increasing gestational age, cesarean section rate, fetal The rate of embarrassment and neonatal respiratory complications, neonatal mortality were increased, and there was significant difference (P <0.05). The results suggest that: in the 40th week of gestation, the placenta has not been aged, maternal and child untimely termination of pregnancy should be of great significance.