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PVI IN ANALYZING PRESSURE VOLUME RELATIONSHIP : EFFECT OF A BOLUS MANNITOL ADMINISTRATION Akihiko Wachi 1 , Kiyoshi Sato 1 , Suguru Inao 2 , Angelo L Maset 2 , Anthony Marmarou 2 1Department of Neurosurgery, Juntendo University Keyword: ICP , pressure volume index , mannitol , head injury pp.661-667
Published Date 1990/7/1
DOI https://doi.org/10.11477/mf.1406900077
  • Abstract
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It has been considered that mannitol reduces a raised intracranial pressure effectively by impro-ving pressure volume relationship. The objective of this study is to determine how the pressure volume status is changed by a bolus mannitol administration with using several biomechanical parameters (intracranial pressure, pressure volume index, and intracranial elastance). Our data in-dicated that mannitol changed the PVI more sensitively than ICP and elastance. "Estimated Intracranial Volume Change (EICVC)" has been newly defined during mannitol infusion on the basis of PVI and ICP change. EICVC for first 30 minutes-period at which the intracranial pre-ssure most vigorously decreased was only about 5 ml in volume. The temporal course of EICVC and ICP were not different, thus, it could account for the change of ICP properly. However, the temporal course of PVI indicating the intracranial venous blood pooling, can not be explained only by EICVC since the PVI has been changed more rapidly than any other parameters. Therefore, we speculated that the ratio of intracranial com-ponents could be more largely altered by man-nitol than the net of intracranial volume change. The fundamental mechanism of ICP reduction by mannitol is possibly the brain water movement into venous circulation.


Copyright © 1990, 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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