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A HYPOTHESIS ON THE SHRINKAGE OF BRAIN BY HYPOCARBIA:QUALITATIVE Kunio SUWA 1 , Hideo YAMAMURA 1 1Department of Anesthesia, University of Tokyo School of Medicine pp.1279-1285
Published Date 1968/12/1
DOI https://doi.org/10.11477/mf.1406202480
  • Abstract
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Hyperventilation has been widely applied for neurosurgical anesthesia in order to reduce the brain volume and to obtain the optimum surgical condi-tions. The mechanism of this decrease in brain volume has been attributed solely to the decrease in the intracranial blood volume due to hyperventila-tion.

Such decrease in intracranial blood volume, though it probably exists, has never been proven to be large enough to explain the observed decrease in brain volume. In fact, there is evidence that, considering its degree and timing, this decrease in brain volume is difficnlt to be attributed solely to the decrease in intracranial blood volume.

Recent investigations clarified the special perfor-mances of the blood brain barrier to the bicarbonate ions. Simultaneously, the shift of bicarbonate ions between plasma and interstitial fluid with the changein CO2 level was elucidated. Using these observa-tions, a hypothesis was established that the shrin-kage of the brain by hypocarbia is due to the loss of the brain water concomitantly occurring with the loss of the bicarbonate ions from the brain tissue.

This new theory, though it still remains to be a hypothesis, was successfully applied to explain the several discrepancies arisen from the conventional theory (Authors')


Copyright © 1968, 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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