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Clinical Findings on Sudden Sensori-neural Low Tone Deafness and Intra-cochlear Pathogenesis of Inducing the Attack Miyuki Yoshida 1 1Rakute ENT Clinic pp.187-194
Published Date 1989/3/20
DOI https://doi.org/10.11477/mf.1411200316
  • Abstract
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From the clinical observations on sudden sensori-neural low tone deafness of 30 cases, it was con-cluded that this disease seems to be essentially heterogeneous one from the so-called sudden deafness which shows severe hearing loss in the wide range.

Because of tinnitus and sense of fullness on the ear, most of the patients have been misdiagnosed frequently as having conductive deafness such as due to stenosis of the Eustachian tube.

It should be emphasized that the accurate measurement for bone conduction in the lower frequency range is most important to determine whether or not this type of deafness is sensori-neural.

To make sure this procedure, the adequate masking must be carried out.

From a view-point of electrophysiological find-ings in the cochlea, it is reasonable that the onset of this sudden low frequency hearing loss can be attributed to the transient vascular dis-turbance which localized at the upper turn of cochlea.


Copyright © 1989, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1316 印刷版ISSN 0914-3491 医学書院

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