Kilpatrick S J, Laros R K
Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, San Francisco.
Obstet Gynecol. 1989 Jul;74(1):85-7.
The length of the first and second stages of labor was evaluated in 6991 women with singleton gestations at 37-42 weeks with vertex presentation. All patients delivered spontaneously without the use of oxytocin. Four study groups were created based on parity and whether conduction anesthesia was used. The mean lengths and limits (95th percentile) for the first stage of labor, respectively, were as follows: nulliparas: no anesthesia--8.1 and 16.6 hours, conduction anesthesia--10.2 and 19.0 hours; multiparas: no anesthesia--5.7 and 12.5 hours, conduction anesthesia--7.4 and 14.9 hours. Similar data for the second stage were as follows: nulliparas: no anesthesia--54 and 132 minutes, conduction anesthesia--79 and 185 minutes; multiparas: no anesthesia--19 and 61 minutes, conduction anesthesia--45 and 131 minutes. These statistical parameters are useful for defining when a labor becomes abnormal and intervention should be considered.
对6991例孕37 - 42周、单胎头先露的孕妇的第一产程和第二产程时长进行了评估。所有患者均自然分娩，未使用缩宫素。根据产次和是否使用传导麻醉创建了四个研究组。第一产程的平均时长及界限（第95百分位数）分别如下：初产妇：未麻醉——8.1小时和16.6小时，传导麻醉——10.2小时和19.0小时；经产妇：未麻醉——5.7小时和12.5小时，传导麻醉——7.4小时和14.9小时。第二产程的类似数据如下：初产妇：未麻醉——54分钟和132分钟，传导麻醉——79分钟和185分钟；经产妇：未麻醉——19分钟和61分钟，传导麻醉——45分钟和131分钟。这些统计参数有助于确定产程何时变得异常以及应考虑进行干预。
