【摘要】 目的探讨丙泊酚TCI时患者意识消失(LOC)及诱发脑电爆发抑制(BS)时的效应室半数有效浓度(EC50)的影响。方法择期全麻手术患者60例,随机均分为瑞芬太尼组(R组)和生理盐水组(N组)。R组:以4ng/ml靶浓度TCI瑞芬太尼10 min后开始TCI丙泊酚,靶浓度从1μg/ml开始递增,递增梯度为1μg/ml,每一靶浓度输注1min,至脑电监测爆发抑制比(BSR)达到15%后结束试验;N组:以等量生理盐水模拟瑞芬太尼TCI,其余方法与R组相同,期间所有患者每间隔20秒行改良OAA/S评分,改良OAA/S评分<2分定义为LOC,BSR>15%定义为出现BS现象。记录LOC和BSR达15%时的丙泊酚EC50及其95%可信区间(CI)。结果 LOC时R组丙泊酚效应室EC50为1.73μg/ml(95%CI 1.68~1.79μg/ml),N组为2.35μg/ml(95%CI 2.29~2.41μg/ml)(P<0.05)。BSR达15%时R组和N组丙泊酚EC50分别为6.25μg/ml(95%CI 6.18~6.42μg/ml)和6.31μg/ml(95%CI 6.13~6.47μg/ml),两组差异无统计学意义。结论复合TCI瑞芬太尼可降低丙泊酚TCI意识消失时的效应室EC50,但对出现脑电爆发抑制时的丙泊酚效应室浓度无明显影响。更多还原

【Abstract】 Objective To investigate the effect-site concentration for 50% of maximal effect(EC50)of propofol required for loss of consciousness and onset of burst suppression and to assess the effect of target-control infusion(TCI)of remifentanil on these EC50 of propofol.Methods Sixty patients undergoning general anesthesia for scheduled surgery were randomly divided into 2groups(n=30):group R received TCI of remifentanil with a target concentraton of 4ng/ml 10 minutes before TCI of propofol,which started at a target plasma concentration of 1μg/ml and then increased by 1μg/ml step every 1minute until the burst suppression ratio reach to 15%.Group N received a mock TCI of saline instead of remifentanil and the other procedures were as same as group R.During this,all patients were assessed by modified Observer’s Assessment of Alertness/Sedation(OAA/S)scale,the loss of consciousness was definited by modified OAA/S values less than 2,the onset of burst suppression was definited by 15% of burst suppression ratio.Results The EC50 of effect-site concentration of propofol required for loss of consciousness and onset of burst suppression were 2.35(95%CI 2.29-2.41)and 6.31(95%CI 6.13-6.47)μg/ml respectively.The EC50 of propofol required for loss of consciousness was decreased to 1.73μg/ml by TCI of remifentanil,but the EC50 of propofol required for onset of burst suppression did not changed by TCI of remifentanil.Conclusion TCI of remifentanil could decrease the EC50 of propofol effect-site concentration required for loss of consciousness but has no effect on the EC50 of propofol required for onset of burst suppression.更多还原