[大鼠脑缺血后诱发电位:刺激频率的影响]。

M Kocher, T Miyazawa, R Bauer, K A Hossmann
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引用次数: 0

摘要

记录麻醉大鼠全身性前脑缺血前和缺血30 min后24 h的脑电图和体感诱发电位。缺血前,SEP(扫描时间1000 ms)包括初级(N25P50)分量和低幅晚期电位。缺血时,SEP和EEG等电。在缺血后再循环中,1.0 Hz刺激诱发的SEP在24小时内被严重抑制,尽管长潜伏期电位(> 100 ms)恢复。在0.1 Hz的极低刺激频率下,后期成分的振幅显著增加,刺激后-脑电平均诱发活动达到对照组的90%。这些结果表明,极低刺激频率诱发的SEP可作为长时间脑循环停搏后脑功能恢复的早期指标。
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[Evoked potentials following cerebral ischemia in the rat: the effect of the stimulus frequency].

EEG and somatosensory evoked potentials were recorded in anesthetized rats before and up to 24 h after 30 min of global forebrain ischemia. Before ischemia, SEP (sweep time 1000 ms) included primary (N25P50) components and late potentials of low amplitude. During ischemia, SEP and EEG were isoelectric. During postischemic recirculation SEP evoked by stimulation at 1.0 Hz remained severely suppressed for 24 h, although long-latency potentials (> 100 ms) recovered. Using a very low stimulation frequency of 0.1 Hz, late components strongly increased in amplitude and the overall evoked activity in the averaged post-stimulus-EEG reached 90% of control. These results demonstrate that the SEP evoked at very low stimulation frequency may serve as an early indicator of functional brain recovery after prolonged cerebro-circulatory arrest.

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