【摘 要】
：
目的:应用磁共振成像技术,研究全麻药氯胺酮对犬脑磁共振信号强度变化的影响,探索麻醉药在脑内的可能作用部位.方法:刺激程序采用清醒-镇静-意识消失-苏醒的动态过程,扫描为6
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目的:应用磁共振成像技术,研究全麻药氯胺酮对犬脑磁共振信号强度变化的影响,探索麻醉药在脑内的可能作用部位.方法:刺激程序采用清醒-镇静-意识消失-苏醒的动态过程,扫描为60个动态.氯胺酮麻醉按2 mg/kg通过采用恒速泵静脉注射,用药方式为输注.采用1.5T Philips Gyroscan 磁共振系统,运用单次激发EPI扫描序列进行脑功能BOLD法成像并应用Functool软件进行功能分析.结果:氯胺酮麻醉可降低感觉皮层、运动皮层的信号强度,其r值分别为0.79, 0.81,信号变化强度分别为19.5%, 16.6%;丘脑和扣带回区信号也受到抑制,r值分别为0.66, 0.68,信号变化强度为4.5%, 4.7%.上述4个区域信号的抑制变化过程同步;皮层下其他区域包括海马基底节区未引出激活点.结论:氯胺酮麻醉抑制感觉皮层、运动皮层、丘脑和扣带回区域信号强度,而这些区域则可能是氯胺酮作用的靶位.
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