Boyd M E, Usher R H, McLean F H, Kramer M S
Department of Obstetrics and Gynecology, Royal Victoria Hospital, Montreal, Quebec, Canada.
Am J Obstet Gynecol. 1988 Feb;158(2):334-8. doi: 10.1016/0002-9378(88)90150-0.
The obstetric management of 340 pregnancies delivered 2 or more weeks postterm and 1408 pregnancies delivered at 41 weeks is compared with that of 5915 pregnancies delivered at 39 to 40 weeks. In all patients menstrual dating was confirmed by early ultrasonographic examination. Postterm labor in primiparas resulted in a high cesarean section rate because of failure to progress; this increased rate was observed even after controlling for induction of labor and the size of the infant. We suggest that primiparas who go postterm often have increased uterine dysfunction. Uterine dysfunction accounts for the increase in the cesarean section rate and is a partial explanation for "failed" inductions.
将340例孕晚期2周或更久后分娩的妊娠、1408例孕41周分娩的妊娠的产科处理情况，与5915例孕39至40周分娩的妊娠的产科处理情况进行比较。在所有患者中，月经日期均通过早期超声检查得以确认。初产妇过期产时，因产程无进展导致剖宫产率较高；即便在对引产及婴儿大小进行控制后，这一上升的剖宫产率依然可见。我们认为，过期的初产妇常常存在子宫功能异常增加的情况。子宫功能异常导致了剖宫产率上升，并且是“引产失败”的部分原因。
