线栓法制大鼠脑缺血模型操作和评价的改良

目的 介绍线栓法制大鼠大脑中动脉栓寒模型的操作和评价的改良.方法 雄性SD大鼠共120只,随机分成常规组(n=50)、改良组(n=60)和假手术组(n=10),前两组分别用常规线栓法和改良法制作大鼠脑缺血模型,利用体征指标和红四氮唑(2,3,5-triphenyltetrazolium chloride,TTC)染色对所有大鼠进行评价.以TTC染色结果为金标准,比较两种造模方法的成功率,同时计算各项体征指标的灵敏度和特异度,率的比较用χ~2或校正χ~2检验.结果 改良法模型成功率为71.67%,明显高于常规法的52.00%(P=0.034);评价模型是否成功,现有的体征法灵敏度为98.55%,特异度仅为加40.00%,经改良后灵敏度仍为98.55%,而特异度可提高到100.00%(P=0.000).结论 大鼠腩缺血模型经改良后,造模成功率和评价准确性明显提高.

Improvements in the establishment and evaluation of cerebral ischemia models made by thread occlusion in rats

Objective To modify the methods of operation and establishment of cerebral ischemia rat models made by thread occlusion. Method We randomly divided 120 male SD rats into a common group (n = 50), an improvement group (n = 60) and a sham-operated group (n - 10). Rats in the common and improvement groups were made into models using the common and improvement methods separately. All models were evaluated on the basis of physical sign indices and 2,3,5-triphenyltetrazolium chloride (TTC) staining. The TTC staining results were taken as gold standards. Then, we compared the achievement ratios of the two groups, and computed the sensitivity and specificity of every physical sign index based on these standards. The χ~2 or correction χ~2 test was used to compare the ratios. Results (1) The achievement ratio in the improvement group was significantly higher than that in the common group (71.67% vs. 52.00%, P = 0.034). (2) The sensitivity of evaluation for both common and improvement methods was 98.55%. However, the specificity of evaluation for the improvement method was significantly higher than that for the common method (100.00% vs. 40.00%, P =0.000). Conclusions The establishment achievement ratio and evaluation correctness of models are obviously elevated by modification of the operation and establishment methods.