ON THE LOSS OF HEARING IN TUBAR MIDDLE EAR CATARRH
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概要
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The following results were obtained by examining 60 cases of tubal middle ear catarrh with a 2A-audiometer.<BR>(1) In acute cases hearing was first lost for tones of higher pitches and then with the progress of the lesion the defect often extended to the range of lower pitches.<BR>(2) Recovery set in first for lower tones followed by the restitution of higher tones. Improvement of hearing proceeded alternately for lower and higher tones, until the normal hearing was re-established over the whole range.<BR>(3) Impairment of hearing generally corresponded to a threshold increase by from 20 to 35 db. More pronounced defect was sometimes found, which was especially the case with chronic cases.
- 社団法人 日本耳鼻咽喉科学会の論文