异丙酚、咪唑安定和硫喷妥钠对鼠局灶脑缺血/再灌注后氨基酸堆积的影响  

Effects of propofol ,midazolam and thiopental on amino acid accumulation in ischemic areas in rats subjected to focal cerebral ischemia/reperfusion

作　　者：陈莲华[1] 贡沁燕[2] 高慧[3] 肖常思[1] 

机构地区：[1]复旦大学眼耳鼻喉科医院麻醉科,上海市200031 [2]复旦大学基础医学院药理教研室 [3]复旦大学基础医学院神经生物实验室

出　　处：《中华麻醉学杂志》2001年第11期666-668,共3页Chinese Journal of Anesthesiology

摘　　要：目的　观察异丙酚、咪唑安定和硫喷妥钠对鼠局灶脑缺血 再灌注后缺血部位氨基酸类神经递质含量的影响。方法　采用大脑中动脉 (MCA)内线栓法诱发局灶脑缺血。雄性SD大鼠随机分为 5组 ,每组 6～ 7只。缺血组 :仅经历 3hMCA阻塞 ;再灌注组 :经历 3hMCA阻塞和 3h再灌注 ;三个用药组 :于再灌注前即刻分别腹腔内注射异丙酚、咪唑安定和硫喷妥钠 5 0mg·kg- 1 ,再灌注3h后 ,处死鼠 ,迅速取脑 ,用高效液相色谱法测脑组织兴奋性氨基酸类含量。结果　异丙酚、咪唑安定明显减少再灌注期缺血部位门冬氨酸、谷氨酸堆积 ;异丙酚增强 ,而咪唑安定减小GABA堆积 ;硫喷妥钠无明显作用。Objective Increasing evidence shows that excitatory amino acids (EAAS) play an important role in the development of brain ischemia/reperfusion damage EAAS accumulation in ischemic tissues induces a sequence of biochemical reactions and eventually leads to cell death The aim of this study was to investigate the effects of propofol ,midazolam and thiopental on amino acid accumulation in ischemic areas in rats subjected to focal cerebral ischemia Methods Male SD rats weighing 240 260g were anesthetized with 10% chloral hydrate 350mg/kg and middle cerebral artery (MCA) occlusion was performed according to the method of Longa The animals were divided into 5 groups of 6 7animals each: group A (ischemia group) received 3 h MCA occlusion without reperfusion and medication; group B (ischemia/reperfusion group) received 3 h MCA occlusion followed by 3 h reperfusion without medication; group C,D and E received propofol or midazolam or thiopental 50mg/kg intrapentoneally after MCA occlusion but before reperfusion Commom carotid artery(CCA),external carotid artery (ECA) and internal carotid artery(ICA) were exposed through a longitudinal incision in the neck A 4 0 nylon thread with rounded tip was inserted into ICA through ECA and threaded cranially until slight resistance was felt The distance from the bifurcation of CCA to the tip of the nylon thread was about 22 cm In this way MCA was occluded After 3 h MCA occlusion the nylon thread was withdrawn to allow reperfusion After 3 h reperfusion the animals were sacrificed with lethal dose of chloral hydrate Brain was removed immediately Hemispheres of both sides were weighed separately and kept at -75℃ Concentrations of various amino acids (aspartate,glutamate,glycine,taurine and GABA) of each hemisphere were measured with high performance liquid chromatography Results Propofol and midazolam significantly reduced aspartate and glutamate accumulation in ischemic areas during reperfusion Propofol augmented but midazolam diminished GABA accum

关 键 词：异丙酚 咪达唑仑 硫喷妥钠 兴奋性氨基酸类 脑缺血 再灌注 麻醉药 

分 类 号：R614.1[医药卫生—麻醉学]