Cerebral Angiography and Electroencephalography in Cerebrovascular Disease

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  • YOSHII NOBUO
    Division of Neurological Surgery Department of Surgery, Keio University School of Medicine

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The continuous EEG recording was performed on 48 patients with cerebrovascular diseases before, during and after the injection of the contrast medium into the common carotid artery. The contrast medium was conditioned as equally as used in the cerebral angiography. Injections of Ringer's solution were made to the 48 cases in order to compare the results. The same examinations were performed also on 5 normal persons. 1) Significant changes in EEG were not observed in the normal persons. 2) EEG changes appeared in few cases with cerebrovascular diseases by injecting the Ringer's solution. 3) EEG alterations appeared in 33% of the cases with the cerebrovascular diseases during and/or after the injection of contrast medium. 4) Focal abnormality in EEG which was most frequently seen, appeared in 13 cases. It must be noted that the focal abnormality which had not been seen before, appeared after the injections, and that the extent of the appearance of the focal abnormality was considerably enlarged in some cases. Changes in frequency and amplitude of the basic waves were found in 4 cases. Bilateral spike appeared in one case. 5) The kinds and degrees of the clinical symptoms were not associated with the appearance of EEG abnormality. As to the relationship between the appearance rate of abnormal EEG and the kinds of the diseases, the rate in the cerebral hemorrhage showed insignificant differences from that in cerebrovascular disease, though the former was slightly lower. The local disturbance in the brain existed in most of the patients with the cerebrovascular diseases, though its symptom did not always appear. It is presumed in such instances that the metabolic disturbance becomes apparent and that EEG change is induced by the injection of the contrast medium in the cerebral angiography.

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