CAJ | 학술논문

目的评价不同剂量右美托咪啶对七氟醚抑制50%下腹部手术患者切皮诱发应激反应的最低肺泡气有效浓度(MACBAR)的影响.方法择期全麻下拟行下腹部手术患者60例,年龄25～55岁,体重45～75 kg,ASA分级Ⅰ或Ⅱ级,采用随机数字表法,将患者随机分为对照组(D0组,n=15)和不同剂量右美托咪啶组(D1～3组,n=15).D0组不使用右美托咪啶,D1-3组经10 min静脉注射右美托咪啶0.1 μg/kg负荷剂量后,分别以0.4、0.8、1.2μg·kg-1·h-1的速率静脉输注30 min后进行麻醉诱导.D0-3组第1例患者呼气末七氟醚浓度分别为3.0%、2.5%、2.0%、1.5%,以切皮时患者MAP或HR较基础值上升＜15%为抑制交感肾上腺反应有效,若抑制交感肾上腺反应有效则下一例呼气末七氟醚浓度降低一级,若无效则升高一级,相邻浓度比为0.9.计算七氟醚MACBAR及其95%可信区间(95%CI).结果 D0～3组七氟醚MACBAR及其95%CI分别为:2.85%(2.44%～3.32%)、1.9l%(1.6l%～2.26%)、1.52%(1.3l%～1.77%)、1.34%(1.15%～1.57%).与D0组比较,D1-3组七氟醚MACBAR均降低(P＜0.05);与D1组比较,D2组和D3组七氟醚MACBAR降低(P＜0.05);D2组和D3组七氟醚MACBAR比较差异无统计学意义(P＞0.05).结论右美托咪啶0.4、0.8和1.2μg·kg-1·h-1连续输注30 min可降低七氟醚MACBAR,增强七氟醚抑制应激反应的效应,且呈剂量依赖性.
목적 평개불동제량우미탁미정대칠불미억제50%하복부수술환자절피유발응격반응적최저폐포기유효농도(MACBAR)적영향.방법 택기전마하의행하복부수술환자60례,년령25～55세,체중45～75 kg,ASA분급Ⅰ혹Ⅱ급,채용수궤수자표법,장환자수궤분위대조조(D0조,n=15)화불동제량우미탁미정조(D1～3조,n=15).D0조불사용우미탁미정,D1-3조경10 min정맥주사우미탁미정0.1 μg/kg부하제량후,분별이0.4、0.8、1.2μg·kg-1·h-1적속솔정맥수주30 min후진행마취유도.D0-3조제1례환자호기말칠불미농도분별위3.0%、2.5%、2.0%、1.5%,이절피시환자MAP혹HR교기출치상승＜15%위억제교감신상선반응유효,약억제교감신상선반응유효칙하일례호기말칠불미농도강저일급,약무효칙승고일급,상린농도비위0.9.계산칠불미MACBAR급기95%가신구간(95%CI).결과 D0～3조칠불미MACBAR급기95%CI분별위:2.85%(2.44%～3.32%)、1.9l%(1.6l%～2.26%)、1.52%(1.3l%～1.77%)、1.34%(1.15%～1.57%).여D0조비교,D1-3조칠불미MACBAR균강저(P＜0.05);여D1조비교,D2조화D3조칠불미MACBAR강저(P＜0.05);D2조화D3조칠불미MACBAR비교차이무통계학의의(P＞0.05).결론 우미탁미정0.4、0.8화1.2μg·kg-1·h-1련속수주30 min가강저칠불미MACBAR,증강칠불미억제응격반응적효응,차정제량의뢰성.
Objective To investigate the effects of different doses of dexmedetomidine on the minimum alveolar concentration of sevoflurane for blunting responses to skin incision ( MACBAR ) in patients undergoing lower abdominal surgery. Methods Sixty ASA Ⅰ or Ⅱ patients, aged 25-55 yr, weighing 45-75 kg, undergoing electire lower abdominal surgery under general anesthesia, were randomly divided into 4 groups ( n = 15 each): control group (Do group) and 3 dexmedetomidine groups (D1, D2 and D3 groups). The patients were unpremedicated.Dexmedetomidine was not used in group D0. A loading dose of dexmedetomidine 0.1μg/kg was injected iv over 10 min, and then dexmedetomidine was infused at a rate of 0.4, 0.8 and 1.2 μg· kg- 1 · h - 1 for 30 min in groups D1-3 respectively. Anesthesia was induced with inhalation of 8 % sevoflurane. Laryngeal mask airway was inserted when BIS value decreased to 45-55. The patients were mechanically ventilated with inhalation of sevoflurane and a mixture of 50% nitrous oxide and 50% oxygen, and the fresh gas flow was set at 1 L/min. In D0-3 groups, the initial end-tidal concentrations of sevoflurane were 3.0%, 2.5%, 2.0% and 1.5% respectively. The patients' response to skin incision was described as effective if MR or MAP increased by ＜ 15%, or ineffective (MR or MAP increased by ≥ 15%). When the response was effective, the end-tidal concentration of sevoflurane was decreased in the next patient, when ineffective, increased, and the ratio between the two successive concentrations was 0.9.The MRCBAR of sevoflurane was determined by up-and-down method, and 95% confidence interval was calculated.Results The MRCBAR (95% confidence interval) of sevoflurane was 2.85% (2.44%-3.32%), 1.91%(1.61%-2.26%), 1.52% (1.31%-1.77%), and 1.34% (1.15%-1.57%)in D0-3 groups respectively. The MRCBAR of sevoflurane was significantly lower in D1-3 groups than in D0 group, and in D2 and D3 groups than in group D1 (P ＜0.05＝. There was no significant difference in MRCBAR of sevoflurane between D2 and D3 groups (P ＞0.05) .Conclusion Continuous infusion of dexmedetomidine at 0.4, 0.8 and 1.2 μg·kg-1 ·h-1 for 30 min results in a decrease in MACBAR of sevoflurane and enhances the inhibitory effect of sevoflurane on the stress response, and in a dose-dependent manner.