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THE FINDINGS OF AUDITORY AND SOMATOSENSORY EVOKED POTENTIALS IN BRAIN DEATH CONFIRMED BY APNEA TEST Tetsuo Yokoyama 1 , Kenichi Uemura 1 , Hiroshi Ryu 1 , Tsunehiko Miyamoto 1 , Kenji Sugiyama 1 , Tsutomu Tokuyama 1 , Aritoshi Shirasaka 1 1Department of Neurosurgery, Hamamatsu University School of Medicine pp.561-567
Published Date 1988/6/1
DOI https://doi.org/10.11477/mf.1406206121

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  • Abstract
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The findings of AEP and SEP in the cases with brain death confirmed by the apnea test had not been reported. We studied the features and the characteristic changes of those evoked potentials in 7 cases of brain death.

The etiology of brain death in those cases were the primary intracranial lesions in six and the brain ischemia secondary to cardiac arrest in the others. The apnea test and the recordings of AEP and SEP were performed in the same day in most cases. The mean intervals from the application of the respirator to the apnea test and to cardiacarrest were 5.8±7.1 days and 5.9±7.2 days, re-spectively. Cardiac arrest occured with mean of 11.8±8.0 days after the application of the respi-rator. AEP showed absent responses in six cases (86%) and wave I only in the other (14%). SEP showed P 1-N 1 in four cases (57%) and no re-sponses in three (43%). The components of AEP were disturbed earier than those of SEP and cases were classified into three types according to those findings. Type I (one case, 13%) : wave I only in AEP and P 1-N 1 in SEP. Type II (three cases, 28%) : no wave in AEP and P 1-N 1 in SEP. Type III (three cases, 28%) : no wave in AEP and SEP.

AEP and SEP seem to reveal the process of brain death and those findings seemed to suggest the blood circulation such as ; Type I: represents no blood circulation in the brain stem and the upper spinal cord but the circulation in the audi-tory nerve was still preserved, Type II : the circu-lation in the auditory nerve was disturbed but the peripheral blood circulation was kept intact, Type III : the peripheral blood circulation was collapsed.


Copyright © 1988, Igaku-Shoin Ltd. All rights reserved.

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

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