Mesri J C, Dellepiane C
Sección Neurofisiológica, Hospital Juan A. Fernández, Buenos Aires.
Medicina (B Aires). 1991;51(4):327-30.
In this study we relate our experience in 7 cases of photosensitive epilepsy and the effect of different types of filters upon the photoconvulsive response (PR). The study was performed with an 8 channels electroencephalograph and the patients were stimulated with a Joule lamp (1 c/sec-30 c/sec). Red, yellow, blue and green cellophane paper filters were used. The EEG response presented bilateral spikes or polyspikes and slow wave paroxysmal discharges. In the presence of a blue filter, the PR appeared later: an average of 6 seconds of closing the eyes and the response had a lower amplitude. In addition the PR did not appear or it was blocked when we used a double blue filter. These results support the role of the retina in the genesis of the PR. We suggest that the blue filter allows a small percentage of light transmission and under these conditions the electrical events that follow light stimulation do not occur.
在本研究中，我们阐述了7例光敏性癫痫患者的经验以及不同类型滤光片对光惊厥反应（PR）的影响。该研究使用8通道脑电图仪进行，患者用焦耳灯（1次/秒 - 30次/秒）进行刺激。使用了红色、黄色、蓝色和绿色玻璃纸滤光片。脑电图反应表现为双侧棘波或多棘波以及慢波阵发性放电。在蓝色滤光片存在的情况下，光惊厥反应出现得较晚：平均闭眼6秒，且反应幅度较低。此外，当我们使用双层蓝色滤光片时，光惊厥反应未出现或被阻断。这些结果支持视网膜在光惊厥反应发生过程中的作用。我们认为蓝色滤光片允许少量光透过，在这些条件下，光刺激后不会发生电活动。
