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The Diagnostic Value of ABR in Acoustic Neuroma Shinro Ito 1 1Department of Otorhinolaryngology, Tokyo Medical College pp.907-914
Published Date 1985/11/20
DOI https://doi.org/10.11477/mf.1492210048
  • Abstract
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 The diagnostic evaluation of ABR was studied on 28 ears (20 patients) of acoustic neuroma, which were surgically confirmed. The results arefollowings.

 1) ABRs of acoustic neuromas could be devided into 3 types : (a) clear recognizable Wave I with indistinct or absent succeeding waves, (b) no response, (c) ABR with prolonged latency of Wave 1 .

 2) Type (a) and type (b) have been proved to be useful indicators for diagnosis of the acoustic neuroma.

 3) Both Waves I and V could be obtained in a relatively few cases, in this study, so the study of type (c) revealed that the prolonged latency of Wave V was the most appropriate parameter among the I - V latency difference, latency differences of Wave V between affected and non-affected ears and I - V difference between right and left ears.

 4) Relative to 3) the diagnostic criteria of Wave V latency prolongation were determined in the stand point of differential diagnosis between retrocochlear and cochlear lesions.

 5) Summarizing the above mentioned, it can be concluded that ABR is an excellent tool for diagnosis of acoustic neuroma.


Copyright © 1985, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 印刷版ISSN 0386-9679 医学書院

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