目的:探讨两种分娩镇痛法的镇痛效果及对母婴影响。方法:初产妇250例,随机分两组,硬外组135例,笑气组115例,同期自然分娩100例为对照组,分别观察镇痛效果、产程时间及母婴结局。结果:两镇痛组镇痛有效率明显高于对照组(P<0.01);笑气组活跃期明显缩短(P<0.05);三组母婴结局无统计学差异(P>0.05)。结论:两种镇痛法均安全有效,笑气吸入能缩短产程。 Objective: To investigate the analgesic effects of two kinds of labor analgesia and their effects on mother and infant. Methods: The primipara of 250 cases were randomly divided into two groups, 135 cases in the hard group, 115 cases in the nitrous oxide group, and 100 cases in the same period of natural childbirth as the control group. The analgesic effects, labor duration and maternal and infant outcomes were observed. Results: The analgesic efficacies of the two analgesic groups were significantly higher than those of the control group (P <0.01). The active phase of the laughing group was significantly shortened (P <0.05). There was no significant difference between the three groups (P> 0.05). Conclusion: Both analgesia methods are safe and effective, and inhalation of nitrous oxide can shorten the labor process.