伝音難聴のオージオグラム聴力型—特に高音漸傾型について

AUDIOMETRIC PATTERN OF CONDUCTIVE HEARING LOSS

　Ⅰ．はじめに

　1971年Andersonら，また1976年深谷らは，ともに高音障害型オージオグラムを示す伝音難聴の数例において中耳腔を手術的に開いてその病変を確認し，高音漸傾型の伝音難聴がきぬたあぶみ関節部の索状物によつてひきおこされることを述べている。

　著者も最近同様の症例を経験したので，その症例を報告するとともに，伝音難聴と高音漸傾型オージオグラムとの関係について若干の統計的観察を行ない，考察を加えた。

　Audiometric pattern of conductive hearing loss,particularly conductive high-tone hearing loss, was investigated.

　The following results were obtained, 1) It was confirmed that connective tissues between the incudostapedial joint produced conductive high-tone hearing loss.

　2) The conductive high-tone hearing loss is not always rare, and it cannot be thought that most of them are produced by disturbance of the incudostapedial joint.

　3) It was confirmed that the high-tone hearing loss more frequently appears in perceptive deafness than in conductive deafness, but from this audiometric pattern it is not able to diffcrenciate conductive from perceptive deafness. And it isdifficult to determine any abnormality in the tympanic cavity from this audiometric pattern.