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THE SOMATOSENSORY EVOKED RESPONSES OF THALAMIC TUMOR Tomokazu Goya 1 , Akinobu Fukumura 1 , Mamoru Yoshida 1 , Yasuhiko Matsukado 1 1Department of Neurosurgery, Kumamoto University, School of Medicine pp.789-794
Published Date 1974/8/1
DOI https://doi.org/10.11477/mf.1406203582

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  • Abstract
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Somatosensory Evoked Responses (SER) to electri-cal stimulation of the contralateral median nerve were studied in five patients with thalamic tumor. Each patient underwent thorough neurological ex-amination, including serial angiography and air study.

Before the recording of SER surgical intervention for reducing increased intracranial pressure was made, if indicated, and recording was repeated dur-ing hospitalizations.

According to precise evaluation of symptoms and findings, the location of the tumor was analized and predominant involvement of thalamic nuclei was determined, which was later confirmed by autopsy.

The purpose of present paper was concerned mainly to the physiological significance of recorded pattern by the thalamic tumor and relation between suppressed late components (longer than 80-100 msec in latency) and involvement of non-specific group of the thalamic nuclei.

The results obtained were as follows :

1) Lesion in the specific thalamic nuclei and diffuse thalamic disturbance presented the similar pattern of SER. That was the early components and late components were both suppressed.

2) Late components were more suppressed on the disturbance of the non-specific thalamic nuclei.

3) Concerning physiological meaning of the late components of SER, the possibility was brought up that it was formed not only by the impulses from specific projection system but also diffuse projecting impulses ascending from the non-specific thalamic nuclei to the cortex and passing through the specific thalamic nuclei took part in denoting the late com-ponents.


Copyright © 1974, Igaku-Shoin Ltd. All rights reserved.

基本情報

電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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