名词难产
1. Results Pain in observation group is much less than that in control group (P 0.05), and the birth process is significantly shorter (P 0.01) and parodynia rate is lower than that in control group (P 0.05).
结果观察组疼痛明显低于对照组（P0.05），活跃期及总产程明显短于对照组（P0.05），难产率低于对照组（P0.05）。
2. Conclusions Nitrogen monoxide can reduce pain in delivery significantly, and it can also shorten birth process and decrease parodynia rate, which are very important for the improvement of perinatal quality
结论笑气用于分娩镇痛能明显减轻产妇疼痛，缩短产程，降低难产率，对提高围产质量有重要意义