Objective To investigate the effect of obstructive sleep apnea hypoxia on learning memory capacity in rat after ischemia.Methods Eighty healthy male wister rats were randomly divided into:sham operation group (SO group,n =20),merely ischemia group (I/R group,n =20),and obstructive sleep apnea hypoxia for 7 days ischemia group (IH7 + I/R group,n =20),obstructive sleep apnea hypoxia for 21 days ischemia group (IH21 + I/R group,n =20).Obstructive sleep apnea hypoxia ischemia groups were respectively given obstructive sleep apnea hypoxia for 7 days and 21 days.Ischemia animals were prepared cerebral ischemia-reperfusion model by improved pulsinelli four vessels block (4-VO),the morphological changes of hippocampus nerve cells of rat brain were detected with HE,neuron pathology in hippocampal regin was observed using electron microscope,and learning memory capacity of rats were assessed by the Morris water maze test.Results Compared with the SO group,the I/R group demonstrated shortened escaping latency,increased frequency of crossing the platform in the water maze test,decreased survival rate of neurons,and increased apoptotic cells and ultrastructure damages (P ＜ 0.05).Compared with the I/R group,obstructive sleep apnea hypoxia ischemia groups showed shortened escaping latency,increased frequency of crossing the platform,decreased survival rate of neurons,and increased apoptotic cells and ultrastructure damages (P ＜ 0.05),especially in the IH21 + I/R group (P ＜ 0.05).Conclusions Obstructive sleep apnea hypoxia can increase the damage of learning memory capacity.This damage is related to hippocampus nerve loss and ultrastructure injury from obstructive sleep apnea hypoxia.%目的 探讨阻塞性睡眠呼吸暂停低通气综合征(OSAHS)模式低氧对脑缺血再灌注大鼠学习记忆的影响.方法 80只雄性Wistar大鼠采用数字随机法随机分成假手术组(SO组,20只)、单纯脑缺血再灌注组(I/R组,20只)、OSAHS低氧7d脑缺血再灌注组(IH7+ I/R组,20只)、OSAHS低氧21 d脑缺血再灌注组(IH21+ I/R组,20只).造模前,0SAHS低氧各组分别给予间歇性低氧7d、21 d.采用改良的Pulsinelli四血管阻断法制备脑缺血再灌注模型,HE染色观察海马区神经细胞形态变化,电镜观察海马区神经细胞超微结构;Morris水迷宫测试检测大鼠视空间记忆能力.结果 与SO组比较,I/R组水迷宫测试潜伏期延长、穿台次数减少,大鼠神经细胞存活率降低,神经细胞超微结构损伤严重(P＜0.05).与I/R组比较,OSAHS低氧各组大鼠逃避潜伏期均延长、穿台次数均减少,神经细胞存活率均降低,神经细胞超微结构损伤更为严重(P＜0.05).上述变化在IH21+ I/R组最为显著(P＜0.05).结论 OSAHS模式低氧可加重脑缺血再灌大鼠学习记忆功能障碍,与海马区神经细胞丢失及神经元超微结构损伤有关.
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