The impact of parity on course of labor in a contemporary population
The impact of parity on course of labor in a contemporary population
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DOI：
10.1111/j.0730-7659.2006.00069.x
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发表时间：
2006-03-01
影响因子：
2.5
通讯作者：
Zhang, J
中科院分区：
文献类型：
--
作者：
Vahratian, A;Hoffman, MK;Zhang, J
背景：很少有研究深入研究经产妇的分娩过程，以确定在第一胎之后分娩是否有任何额外的影响。这项研究的目的是确定在当代产科实践中，产次对分娩进展的影响。方法：我们的样本包括2002年1月至2004年3月在美国特拉华州一家机构分娩的所有低风险妇女，活产婴儿(n=5589)。产次=0(n=2,645)；产次=1(n=1,839)；产次=2(n=750)；产次=3+(n=355)。结果：经产妇在胎次=1、胎次=2、胎次=3+时4~10 cm的产程分别为293分钟、300分钟和313分钟，明显快于未产妇(胎次=0为383min)，第二产程时间较短。但经产妇在活跃期和第二产程的持续时间无显著差异。结论：在经产亚组中，额外生育似乎对分娩进程没有影响。在当代人口中，未产妇和经产妇之间活跃期的持续时间差别要小得多。
Background: Few studies have examined in depth the labor progression of multiparas to determine if there is any additional impact of being parous beyond the first birth. The objective of this study was to determine the effect of parity on labor progression in contemporary obstetric practice. Methods: Our sample consisted of all low-risk women who delivered a term, live-born infant from January 2002 to March 2004 at a single institution in Delaware, United States (n = 5,589). The median duration of labor by each centimeter of cervical dilation was computed for parity = 0 (n = 2,645); parity = 1 (n = 1,839); parity = 2 (n = 750); and parity = 3 + (n = 355). Results: Multiparas had a significantly faster labor progression from 4 to 10 cm (293, 300, and 313 min, respectively, for parity = 1, parity = 2, and parity = 3 +), compared with nulliparas (383 min for parity = 0), as well as a shorter second stage of labor. However, no significant differences were found in duration of the active phase or the second stage of labor among multiparas. Conclusions: Additional childbearing appears to have no effect of on the progression of labor among multiparous subgroups. The difference in duration of the active phase between nulliparas and multiparas is substantially smaller in a contemporary population.