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pp.168-172
Published Date 1953/4/20
DOI https://doi.org/10.11477/mf.1492200873

OWADA and TSUBOI conducted a test by which they were enabled to eliminate symptoms of unilateral tinnitus with selected use of 14 different pure tones and, then, tried to estab-lish the relation between the hearing defect and elimination level, the level of tone at which the tinnitus is eliminated.

(1) Elimination level is shown to be loweredin correspondence to patient's hearing defects as they show in the audiometric chart, viz., the number of cycles that are shown in the hearing loss appears to coin-cida with that of tinnitus. The tinnitus of this nature when compared to normal ear in terms of decibels falls somewhere around 60-80db. in other words this type of tinnitus seems to be the result of disturbances occurring in the end organ of hearing or in the nerve itself and, consequently, it may be considered as non-vibrating. Twenty eight ears out of the 50 examined consisted of this type.

(2) The other type of tinnitus is characte-rized by accompaniment of slight loss of hearing that would be shown in the audiometric chart as a horizontal line.Elimination level reached by low tone would require the larger but as higher tones are approached that requirement becomes smaller; the frequency band which covers the tone of tinnitus would be narrow; the level be low; the hearing capacity be good. Such a type should be considered as belonging to the vibrating type of tinnitus and is encountered as a rule the result of middle ear disease.Six ears out of the 50 examined consisted of this type.


Copyright © 1953, 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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