不同时间窗高压氧治疗对脑外伤大鼠认知功能障碍改善的实验研究

Effects of hyperbaric oxygen therapy performed at different times on cognitive dysfunction of rats with traumatic brain injury

目的 研究不同时间窗高压氧治疗对脑外伤大鼠认知功能障碍的治疗效果. 方法 将96只大鼠按随机数字表法分为正常对照组（A组）、液压冲击脑外伤模型组（B组）、液压冲击脑外伤模型＋常规治疗组（C组）、液压冲击脑外伤模型＋常规治疗＋高压氧治疗组（D组）,每组24只;D组在模型建立后根据高压氧治疗的时间点（3、12、24、72 h）分为4亚组（D-3 h组、D-12 h组、D-24 h组和D-72h组,每亚组6只）.B、C、D组采用大鼠侧位液压冲击构建脑外伤模型后分别进行不同处理.应用水迷宫试验对比评价各组大鼠模型脑外伤后认知功能障碍的改变. 结果 在相同时间点寻找水下平台的潜伏期方面,B组最长,其次为C组、D组、A组,且D组中D.72 h组最长,其次为D-24 h组、D-12h组、D-3h组;在穿过原平台区域的次数方面,A组最多,其次为D组、C组、B组,且D组中D-3 h组最多,其次为D-12 h组、D-24 h组、D-72 h组,与B组比较差异均有统计学意义（p〈0.05）. 结论 高压氧治疗可以改善颅脑损伤大鼠的学习能力,对神经功能具有保护作用,且这种高压氧治疗的时间最好在损伤后12 h内完成,并且宜尽早实施.

Objective To investigate the effects of hyperbaric oxygen （HBO） therapy performed at different times on the cognitive dysfunction of rats with traumatic brain injury. Methods The traumatic brain injured models were established by use of lateral fluid percussion in rats. Ninety-six rats were equally randomized into 4 groups： control group （group A）, traumatic brain injured model group （group B）, traumatic brain injured model plus conventional therapy group （group C）, traumatic brain injured model plus both conventional therapy and HBO therapy group （group D）. And group D also divided into 4 subgroups （n=6）： D-3 h group, D-12 h group, D-24 h group and D-72 h groups that HBO therapy was performed at 3, 12, 24 and 72 h of the traumatic brain injury, respectively. The changes of learning and memory abilities before or after the therapy in each group were tested by Morris water maze method. Results Group B had the longest latency of finding the underwater platform as compared with the other 3 groups, followed by group C, group D and group A; as to the 4 sub-groups, D-72 h group had the longest latency of finding the underwater platform as compared with the other 3 groups, followed by group D-24 h, group D-12 h and group D-3 h. Group A could cross the original platform in the spatial probe test most often among all the 4 groups, followed by group D, group C and group B; group A, group C and group D was significantly different in clossing the original platform in the spatial probe test as compared with group B （P〈0.05）; group D-3 h could cross the original platform in the spatial probe test most often among all the 4 sub-groups, followed by group D-12 h, group D-24 h and group D-72 h.Conclusion HBO treatment can effectively improve the cognitive dysfunction of rats with traumatic brain injury, especially those within 12 h of injury.