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６４例早孕患者，在门诊行人工流产术，随机分为两组：实验组４４例，采用５０％Ｎ２Ｏ吸入镇痛麻醉；对照组２０例，不用任何药物。观察了吸入前、扩张宫颈管、人流术终时ＳＢｐ、ＤＢｐ、Ｐ、ＳＰＯ２变化。结果经方差分析和ｔ检验。实验组麻醉前、后比较，两组麻醉前比较Ｐ＞０．０５，对照组术前、术终比较；两组术终比较有显著性差异Ｐ＜０．００１。从不良反应来看：实验组仅占１１％。对照组腹憋胀占１００％，恶心呕吐占６５％。吸入５０％Ｎ２Ｏ镇痛效果确切，人流时病人意识处于朦胧状态，安静、无痛苦、不良反应少，苏醒快等优点
Sixty-four cases of early pregnancy were randomly divided into two groups: 44 in experimental group and 50% of N2O inhaled analgesia in anesthesia group; 20 in control group without any drug. The change of SBp, DBp, P and SPO2 in the end of inhalation, dilatation of cervical canal and abortion were observed. Results by ANOVA and t test. The experimental group before and after anesthesia, before and after anesthesia in both groups compared P> 0.05, the control group before surgery, surgery and final comparison; two groups were significantly different between the end of surgery P <0.001. From the adverse reaction point of view: the experimental group accounted for only 11%. The control group of abdominal bloating accounted for 100%, nausea and vomiting accounted for 65%. Inhalation of 50% N2O analgesic effect is exact, when the flow of patient consciousness in a hazy state, quiet, no pain, fewer adverse reactions, wake up faster