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Delayed Cerebral Dysautoregulation after Recirculation of Cerebral Ischemia Masato MATUSUMOTO 1 , Sen YAMAGATA 2 , Jun MINAMIKAWA 2 , Kenji HASHIMOTO 2 , Haruhiko KIKUCHI 2 , Namio KODAMA 1 1Department of Neurosurgery, Fukushima Medical School 2Department of Neurosurgery, Kyoto University Medical School Keyword: Cerebral ischemia , Cerebral revascularization , Cerebral autoregulation , Cerebral vasomotor paralysis , Direct cortical response pp.503-508
Published Date 1993/6/10
DOI https://doi.org/10.11477/mf.1436900656

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  • Abstract
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Sequential changes of cerebral autoregulation were studied in 20 cats after recirculation of cerebral ischemia. The cerebral autoregulation was evaluated by autoreg-ulation index (A.I.), calculating %� cerebral blood flow (CBF)/� cerebral perfusion pressure (CPP), with chang-ing the mean arterial blood pressure (MABP) within 80-130mmHg. Duration of ischemic insult was 15min after disappearance of direct cortical response (DCR). Follow-ing recovery of cerebral circulation, MABP, CBF and in-tracranial pressure (ICP) were observed sequentially for at least 48 hours.

In 6 of 20 cats the autoregulation was disturbed early after recirculation, and the ICP was increased, resulting in no cerebral blood flow (early deteriorated group).In the other 14 cats the autoregulation was restored im-mediately, but in 7 of the 14 cats it was disturbed again after 24 hours following recirculation (delayed deterio-rated group), finally the ICP was elevated and the CBF became 0 as same as early deteriorated group. In another 7 cats it was not disturbed until 5 (lays. The changes in CBF following insult were five patterns. These were classified into type A (Gradual decrease), type B (Tran-sient increase), type C (Constant maintenance), type D (Relatively rapid decrease) and type E(Rapid decrease). The delayed cerebral dysautoregulation occurred in the types except for type A and type E.

These results suggested there was close relation be-tween delayed dysautoregulation and delayed neuronal dysfunction that we reported previously. Moreover, we considered the delayed dysautoregulation could be speculated from the value of ICP/CBF immediately after recirculation and the pattern of the changes in CBF dur-ing ischemic insult.


Copyright © 1993, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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