局部亚低温对脑梗死大鼠的脑保护作用

背景目前尚缺乏满意的治疗脑梗死的手段.亚低温治疗脑梗死虽然有效,但副作用较大.局部亚低温对脑梗死的治疗可能有较好的作用.目的观察局部亚低温对大鼠缺血脑组织的保护作用,进一步探讨其作用机制.设计以实验动物为研究对象,随机对照的基础研究.单位一所大学医院的神经内科研究所.材料实验于2000-04/2002-01在哈尔滨医科大学第一临床医学院神经内科动物实验室完成,动物为雄性Wistar大鼠50只,体质量(250±25)g,清洁级.干预50只大鼠中随机取10只,分为正常组和假手术组,每组5只.余40只随机分为常温脑缺血组和局部亚低温脑缺血组,各20只.制作大鼠大脑中动脉脑缺血模型,进行局部亚低温处理.主要观察指标各组大鼠脑梗死灶体积、神经功能和血清神经元特异性烯醇化酶的影响.结果大鼠栓塞48h时亚低温组和常温组大鼠脑梗死体积分别为(128.95±13.42)和(84.90±11.36)mm3,神经功能评分分别为1.60±0.24和0.95±0.17,血清神经元特异性烯醇化酶浓度分别为(13.55±4.07)和(9.19±3.42)μg/L,差异均有显著性意义.结论局部亚低温治疗对缺血脑神经元具有保护作用.

Protective effects of local sub-hypothermia on the brain of rat with cerebral infarction

BACKGROUND: There is still no satisfactory therapy for thetreatment of cerebral infarction at present. Although sub-hypothermia is effective in the treatment of cerebral infarction, its side effect is relatively more. Local sub-hypothermia might have favorable effects in the treatment of cerebral infarction.OBJECTIVE: To observe the protective effects of local sub-hypothermia on the ischemic brain tissues in rats to further explore its mechanism.DESIGN: A randomized controlled basic study based on the experimental animals.SETTING: Institute of neurology of a university hospital.MATERIALS: The study was conducted in the Animal Laboratory of Neurology, the First College for Clinical Medicine, Harbin Medical University between April 2000 and January 2002. Fifty male Wistar rats(cleanness grade) with a bodyweight of(250 ± 25) g were selected.INTERVENTIONS: Ten rats were randomly selected from the 50 rats and divided into normal group and sham-operation group with 5 rats each. The rest 40 rats were randomly divided into normal temperature cerebral ischemia group and local hypothermia cerebral ischemia group with 20 rats each. Rat cerebral middle-sized arterial ischemia model was established for local sub-hypothermia disposal.MAIN OUTCOME MEASURES: Impacts on cerebral infarction volume,nerve function, and neuron-specific enolase(NSE) of rats in each group.RESULTS: The cerebral infarction volume at 48 hours after embolism in rats was ( 128.95 ± 13.42) or (84.90 ± 11.36) mm3 respectively, nerve function evaluation was( 1.60 ± 0. 24) or (0. 95 ± 0. 17), and serous NSE concentration was(13.55±4.07) or(9.19±3.42) μg/L in either sub-hypothermia group or normal temperature group, which were significantly different from each other.CONCLUSION: Local sub-hypothermia therapy has protective effects on ischemic cerebral neurons.