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目的 探究新产程标准中第二产程时限延长对妊娠结局及母婴安全的影响.方法 选择新产程标准试行以来,2015年1月1日至2016年12月31日在佛山市南海区第四人民医院分娩单胎足月头先露产妇,记录第二产程时长.根据新、旧产程标准,选择第二产程时长≥2 h的初产妇及≥1 h的经产妇共193例作为观察组(A组),并细分为A1、A2组.A1组(154例)初产妇第二产程时长≥2 h且≤3 h,经产妇第二产程时长≥1 h且≤2 h,A2组(39例)初产妇第二产程时长≥3 h,经产妇第二产程时长≥2 h.随机抽取195例同期分娩且第二产程时长 3 h for primipara and t>2 h for multipara. Another 195 cases who delivered during this period with second stage of labor duration of t< 2 h for primipara and t0.05). However,the incidences of these maternal and neonatal outcomes from A2 group were significantly higher than those of the control group(23.08% vs. 3.08%,28.21% vs. 10.77%,28.21% vs. 13.33%,33.33% vs. 10.77%,7.69% vs. 1.03%,10.26% vs. 3.07%,20.51% vs. 6.67%,P<0.05). Conclusion Compared with the old labor standards ,prolonging the second stage of labor duration within 1 h in the new obstetrics labor standards could effectively decrease the cesarean section rate while increase the vaginal delivery rate without increasing maternal and neonatal risks. However,prolonging the second stage of labor duration more than 1 h could significantly increase maternal and neonatal adverse event rates.