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目的观察右美托咪定增强舒芬太尼用于术后镇痛的效果和副作用。方法全组50例患者，男、女兼有，年龄20~65岁，ASAI~I 级，全麻下行外科手术。随机均分为两组，每组25例。S组要镇痛泵100ml0.9%氯化钠溶液中+盐酸舒芬太尼80μg(0.8μg/ml)；SD组要镇痛泵100m0.9%氯化钠溶液中+盐酸舒芬太尼80μg+盐酸右美托咪定400μg(4μg/ml)。观察并记录：首次PCA时间；PCA有效次数；24h盐酸舒芬太尼总用量和不同时段VAS评分；MAP、HR和呼吸的变化。结果 SD组患者术后24h内盐酸舒芬太尼用量明显少于S组(<0.01)。术后8h内，SD组血液动力学变化明显较术前降低或减少，分别<0.05。SD组在术后24h内副作用发生率显著低于S组(<0.05)；未发现明显的循环抑制、过度镇静和呼吸抑制现象。结论盐酸右美托咪定与盐酸舒芬太尼联合用于患者术后镇痛可增强盐酸舒芬太尼镇痛效果，提高术后镇痛质量、减少盐酸舒芬太尼用量及副作用。“,”Objective The aim of this study was to evaluate the ef ect of combining dexmedetomidine and sufentanyl for intravenous patient-control ed analgesia. Methods 50 ASAⅠorII undergoing abdominal surgery were al ocated to receive either sufentanyl 0.8μg/ml alone (Group S) or sufentanyl 0.8μg/ml plus dexmedetomidine 4μg /ml (Group SD) for postoperative i.v. PCA,which was programmed to deliver loading dose of 3 ml with a 15 min lockout interval and 2ml/h background infusion. Cumulative PCA requirements, pain intensities, cardiovascular and respiratory variables, and PCA-related adverse events were recorded for 24 h after operation. Results Compared with Group S, patients in Group SD required less sufentanyl during the 0–24 h postoperative period and reported significantly lower pain levels throughout the study. Whereas levels of sedation were similar between the groups at each observational time point, decreases in heart rate and mean blood pressure from presurgery baseline at 2, 4, and 8h after operation were significantly greater in Group SD . The 0–24 h incidence of nausea and pruritus was significantly lower in Group SD ( <0.05). There was no bradycardia, hypotension, over sedation, or respiratory depression. Conclusion The addition of dexmedetomidine to i.v. PCA sufentanyl resulted in superior analgesia, significant sufentanyl sparing, less sufentanyl-induced nausea and pruritus was devoid of additional sedation and untoward haemodynamic changes.