Relationship Between Configuration of Audiogram and Prognosis of Hearing Loss in Sudden Deafness

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  • 突発性難聴における聴力型と予後との関係

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The relationship between the configuration of a pure tone audiogram and the prognosis of hearing loss was analyzed in 85 ears of sudden deafness, in which treatment started within two weeks after the onset of hearing loss.<BR>The degree of hearing loss was indicated by the averaged hearing level of five frequencies between 250 Hz and 4 kHz. The audiogram configuration were classified into 8 types.<BR>The results obtained were as follows: 1. The prognosis of a hearing loss was the best in the ears with convex-type audiogram, followed by those with U-shape-type. The prognosis was the worst in the ears in those audiogram showed complete loss.<BR>2. The hearing loss started to recover within a week after introduction of the treatment in more than half of the ears, except in those with total hearing impairment.<BR>3. In the ears with a nearly total hearing loss the recovery process for a hearing loss of 90 dB was divided into two types: rapid recovery and slow recovery.

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