年龄因素对靶控输注右美托咪啶患者意识消失量效关系的影响  被引量:17

Influence of age on hypnotic target plasma concentration of dexmedetomidine administered by TCI

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作  者:周志飞[1] 邬子林[1] 佘守章[1] 许立新[1] 吕婧[1] 

机构地区:[1]广州医学院附属广州市第一人民医院麻醉科,510180

出  处:《中华麻醉学杂志》2012年第2期145-147,共3页Chinese Journal of Anesthesiology

基  金:广东省医学科研基金(A2011477);广州市医药卫生科研基金(201102A213071)

摘  要:目的评价年龄因素对右美托咪啶靶控输注患者意识消失量效关系的影响。方法脊椎.硬膜外麻醉下择期拟行下腹部或下肢手术患者60例,ASA分级I或Ⅱ级。按照年龄分为中青年组(Y组,18~55岁)和老年组(O组,65—85岁),每组30例,每组按右美托咪啶靶浓度,采用随机数字表法将患者随机分为5个亚组,每组6例。Y1-5组右美托咪啶血浆靶浓度分别为0.54、0.64、0.76、0.90、1.07ng/ml;O1-5右美托咪啶血浆靶浓度分别为0.36、0.42、0.51、0.60、0.71ng/ml,以警觉/镇静评分≤2分和睫毛反射消失作为意识消失标准。记录30min内每组患者意识消失的例数及其对应靶浓度,采用概率单位法计算两组意识消失的半数有效浓度(EC50)和95%有效浓度(EC50)及其95%可信区间(95%CI)。结果O组右美托咪啶使患者意识消失的EC50及其95%CI为0.478(0.424—0:536)ng/ml,EC50及其95%CI为0.641(0.567~0.816)ng/ml,Y组右美托咪啶使患者意识消失的EC50及其95%CI为0.738(0.657—0.827)ng/ml,EC95及其95%CI为0.990(0.874~1.267)ng/ml,差异均有统计学意义(P〈0.05)。结论靶控输注右美托咪啶老年患者意识消失的EC50和EC95均低于中青年患者,老年患者对右美托咪啶的镇静效应更敏感。Objective To investigate the influence of age on hypnotic target plasma concentration (Cr) of dexmedetomidine (Dex) administered by TCI.Methods Sixty ASA I - 11 patients aged 18-85 yr undergoing lower abdominal or extremity operation under combined spinal-epidural anesthesia were divided into 2 age groups ( n = 30 each) : 18 yr〈 group 1 〈 55 yr (Y) and 65 yr 〈 group II 〈 85 yr (E). Each group was further divided into 5 subgroups (n = 6 each) receiving Dex administered by TCI at CT of 0.54, 0.64, 0.76, 0.90, 1.07 ng/ml in group Y and 0.36, 0.42, 0.51, 0.60, 0.71 ng/ml in group E respectively. Hypnosis was defined as no response to verbal command (OAA/S score ≤ 2) and loss of eyelash reflex. A quantal response model (probit analysis) was used to calculate the concentration-effect curve and predict plasma EC50 and EC95 (95 % CI) of Dex. Results EC50 (95%CI) was 0.478(0.424-0.536) ng/ml and EC95 (95%CI) 0.641 (0.567-0.816) ng/ml in group E, significandy lower than EC50 (95%CI) 0.738(0.657-0.827) ng/ml and EC95 (95%CI) 0.990(0.874-1.267) ng/ml in group Y. Conclusion The ECs0 and EC95 of dexmedetomidine for hypnosis were significantly lower in the elderly than in younger patients.

关 键 词:右美托咪啶 药物释放系统 意识丧失 剂量效应关系 药物 

分 类 号:R614[医药卫生—麻醉学]

 

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