目的 观察右美托咪啶复合舒芬太尼用于经腹子宫全切术后患者自控静脉镇痛（PCIA）的效果。 方法 2011年3月－2012年6月选择经腹子宫全切术患者90例，年龄39～68岁，体重48～72 kg，美国麻醉医师协会分级Ⅰ～Ⅱ级。采用随机数字表法，将患者随机分为3组，每组各30例。于手术结束即刻行PCIA。对照组（C组）采用舒芬太尼150 μg+昂丹司琼12 mg；S1组采用右美托咪定200 μg+舒芬太尼100 μg+昂丹司琼12 mg；S2组采用右美托咪定200 μg+舒芬太尼150 μg+昂丹司琼12 mg。3组均用生理盐水稀释至100 mL，负荷剂量均为舒芬太尼0.1 μg/kg，静脉镇痛泵背景输注速度2 mL/h，自控给药剂量0.5 mL，锁定时间15 min。记录术后6、12、24和48 h Ramsay镇静评分和视觉模拟评分（VAS），记录不良反应发生情况和患者对术后镇痛的满意度。 结果 3组患者均能获得较好的镇痛效果。其中C组VAS评分较低，但恶心、呕吐、皮肤瘙痒发生率升高；与C组相比，Sl组和S2组Ramsay镇静评分升高，恶心、呕吐、皮肤瘙痒发生率降低，患者满意度升高。S1组患者满意度最高；S2组VAS评分最低。3组均未发生心动过缓、低血压、过度镇静和呼吸抑制。 结论 右美托咪啶可增加经腹子宫全切术患者术后舒芬太尼自控静脉镇痛的效果，提高患者满意度，降低不良反应。
Objectives To overview the systematic reviews/meta-analyses of safety of femoral nerve block (FNB) used as a postoperative analgesic technique in patients undergoing total knee arthroplasty (TKA). Methods We searched databases including The Cochrane Library, PubMed, EMbase, CNKI, WanFang Data, and VIP from inception to July, 2016. Two reviewers independently screened literature, extracted data and used AMSTAR to evaluate the methodological quality of the included studies. The major indexes used to evaluate the safety of FNB were the incidence rates of symptoms including nausea, vomiting, sedation, retention of urine, dizziness, pruritus, hypotension, falls, nenous thromboembolism and deep infection. Results A total of 12 systematic reviews/meta-analyses were included.They assessed the safety of FNB compared with local infiltration analgesia (LIA), periarticular multimodal drug injection (PMDI), epidural analgesia (EA), patient-controlled intravenous analgesia of opioids (PCA) and adductor canal block (ACB), respectively. The methodological quality of included studies were medium, with the scores between 3 to 10. The results of overview indicated that: FNB had lower incidence rates of nausea and vomiting compared with EA and PCA, but had higher than ACB. FNB had lower incidence rates of sedation and retention of urine compared with EA and PCA. FNB had lower incidence rates of dizziness compared with EA and PCA, and lower incidence rate of hypotension compared with EA. Conclusion Current evidence suggests that FNB is safer than EA and PCA. Due to the limited quantity and quality of the included studies, the above conclusions are needed to be verified by more high-quality studies.