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pp.145-149
Published Date 1954/4/20
DOI https://doi.org/10.11477/mf.1492201104

 NCHI presents a method of making a bone conduction test, which he calls the blocked bone conduction test, by using plastic plug in which a hole 1mm in diameter is bored through its long axis for blocking the external canal. Two test tones are used, 250 or 256 and 800 c. p. s The blocked bone conduction test is adequate only in sofar as detecting conduction impairments; Fowler's and difference limen tests only for nerve impairments. By combining these two tests diffential diagnosis of central deafness is made possible. In addition, in studying the mechanism of Gelle's test, the author finds that the increased loudness which is encountered in the bone conduction when plastic plug external canal block is used appears to be the same phenomenon which is met with as the decreased loudness in the former but, opposite in effect.


Copyright © 1954, 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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