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KMID : 0381219880200020243
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Journal of RIMSK
1988 Volume.20 No. 2 p.243 ~ p.255
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A Study on Topography of EEG and flash VEP in Cerebrovascular Disease
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Choi, Jin Yong
Lee, Kyung Duk/Lee, Hyun Ok/Koh, Ji Young/Kwon, Oh Sang/Min, Byoung Kun
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Abstract
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The authors studied the diagnostic usefulness of topography of EEG and flash visual evoked potential (FVEP) in evaluation of the patients with cerebrovascular diseases (CVDs) proven by Brain CT or neurological examination. CVDs of 40 cases were consisted of supratentorial lesions, 16 intracerebral hemorrhages and 24 infarctions.
Using San-ei Topography System 700 with 12 recording electrodes, topography of EEG displays isopotential maps of square of roots of the power spectra over each frequency band; slow wave (delta-theta), alpha activity (alpha 1-alpha 2) and fast activity (beta 1-beta 2).
Topography of FVEP were done by binocular flash light stimuli at the rate of 2/sec with the eye closed, and absolute latency mapping of wave III and wave VII were recorded. Topography, presented with pseudocolor gray scale, was evaluated visually and the asymmetry of topography was considered as abnormal. Interpreting topography of EEG, increased activity of slow wave band and decreased activity of alpha and beta bands were considered as abnormal region functionally. And interpreting topography of FVEP, asymmetrically increased density which meant prolongation of each latency was considered as abnormally prolonged latency of wave
III or wave VII.
The results were as follows:
1) The concordance rate of topography of EEG with lesion sites was 80% and that of topography of FVEP was 65%. Either topography of EEG or topography of FVEP revealed concordance rate of 90%. Therefore, it is thought that performing these two studies simultaneously is very useful in functional evaluation of CVDs.
2) Reduction of the alpha activity (67.5%) and fast activity (60%), which was more sensitive in cases of infarction (70.8%) than in cases of hemorrhage (53.1%), showed higher concordance rate than regional increase of the slow wave activity (47.5%) in the topography of EEG.
3) Concordance rate of wave III latency mapping (67.5%) was higher than that of wave VII latency mapping (47.5%), and wave III latency mapping showed higher concordance rate in the cerebral hemorrhage (75%) than in infarction (62.5%) in the topography of FVEP.
4) Findings of both topography of EEG and FVEP were consistent with lesion in laterality in cases of 3 clinical infarction which was not proven by Brain CT.
Therefore it is suggested that topography of EEG and FVEP is useful in evaluation of early stage of cerebral ischemia.
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