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Japanese

Establishment of the criteria to evaluate intraoperative changes of brainstem auditory evoked potentials during microvascular decompression and acoustic neurinoma excision Tetsuji SEKIYA 1 , Norihito SHIMAMURA 1 , Toru HATAYAMA 1 , Shigeharu SUZUKI 1 1Department of Neurosurgery Hirosaki University School of Medicine Keyword: acoustic neurinoma , brainstem auditory evoked potentials , intraoperative monitoring , microvascular decompression pp.431-436
Published Date 1996/5/10
DOI https://doi.org/10.11477/mf.1436901207
  • Abstract
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Although monitoring of brainstem auditory evoked potentials (BAEP) is helpful to preserve hearing during operations in the cerebellopontine angle such as micro-vascular decompression and excision of an acoustic neurinoma, criteria for what and when changes in BAEP should be communicated to the surgeon have not been well established. An exhaustive review was, therefore, conducted of the English and Japanese litera-ture on this topic. Analysis of the results of this litera-ture review led to the conclusion that during a micro-vascular decompression procedure, the surgeon should be warned as soon as progressive prolongation of the latency of wave V of the BAEP exceeds 1.5msec. It is reasonable to apply stricter criteria in acoustic neurino-ma excision; prolongation of wave V latency even less than 0.5msec should be regarded as the warning sign to the surgeon who is trying to preserve hearing. Whenev-er BAEP monitoring is performed, it is crucial that changes in the BAEP are evaluated in light of the par-ticular surgical procedure in progress and that the per-son who evaluates these changes is well versed in the conduct of the surgical procedure.


Copyright © 1996, 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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