経中耳性感音系難聴の臨床的研究

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  • 谷 俊治
    東京医科歯科大学耳鼻咽喉科学教室

書誌事項

タイトル別名
  • CLINICAL STUDIES OF PERCEPTIVE DEAFNESS DUE TO MIDDLE EAR LESIONS IN CHILDREN
  • ケイ チュウジ セイカンオンケイ ナンチョウ ノ リンショウテキ ケンキュウ

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Study was made of the perceptive deafness due to middle ear lesions in children.<br>Therapeutic effect of cortisone (per os), X-ray radintion to the eustachian tube or adenotomy was examined respectively on the deafness with 79 ears in 41 children, and cortisone was found to be most effective.<br>Following are the findings on property of the deafness obtained by comparison with the cases in adults.<br>1. In adults there occured the unilateral as well as the bilateral lesions, but most of the children were of the bilateral.<br>2. Sudden onset of hearing loss was commonly seen in adults, whereas gradual loss of hearing was frequent in children.<br>3. Early treatment was rather effective on both adult and infant.<br>4. Patients with inflammatory changes in the tympanic cavity, the eustachian tube and the nasopharynx gave quite succesful results of the treatment.<br>5. The best results were obtained in the cases which showed a type of gradual loss toward the high tone and yet with a difference less than 10db between 500cps and 1000cps in the bone conduction audiogram. An increace of such difference reduced the effectiveness of therapy.<br>From the above findings the conclusions are attained that the perceptive deafness due to middle ear lesions may be a type of pure perceptive deafness or of mixed deafness caused by the inflammatory changes in the nasopharnx, the eustachian tube and the tympanum, being devided into two types, acute (sudden deafness) and chronic (gradually progressive deafness), and that in the children with complication of such as oto-salpingitis and/or adenoiditis this type of deafness may easily induced and yet sometimes may develop to a pure inner-ear deafness.

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