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pp.497-500
Published Date 1951/12/20
DOI https://doi.org/10.11477/mf.1492200582

TSUIKI performed fenestration operations on the hor-izontal canal of 4 patients who complained of hard of hearing. True fenstrations were instituted in some but, in others, the bony wall of the canal was thin-ned down to become almost transparent so that the membranous labyrinth could be seen as a dark linear structure. As results of this operation the patients were not onlyenabled to maintain hearing which the Patients properatively but showed some definite improvements. It is interesting to ponder whether that improvement is due to a new formation of acoustical island or to increase in area of the field for preceptibility of high tones.

In cases of inner ear deafness which was found among this number, the operation resulted in establish-ing a great improvement in the previously existing tinnitus, as in Case 3, or a complete relief, as in Care 4. The existence of close relationship between the amount of tinnitus and the amount of hearing in a reverse proportion must be recognized. In as much as tinnitus may be that of such a character as to be in agreement with speech frequecy. reception of speech would be greatly enhanced if such tinnitus were allayed or eliminated: improvement of hearing thus effcted may be more apparent than real. It appeared that the improvement seen in Case 4 to be falling under this form of abjustment but hearing in such cases may be further improved were they equ-iped with proper hearing aids.


Copyright © 1951, 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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