一側高度難聴者の健側耳に生じた急性難聴

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  • Incidence of Sudden Hearing Loss in the Contralateral Ear in Patients with Previously Impaired Hearing.

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Eight cases of acute onset hearing loss in the contralateral ears of severely hearing-impaired and profoundly deaf subjects were reported. The preceding hearing losses were sudden deafness in 5, mumps in 1, post acoustic neuroma surgery in 1, and unknown in 1. The recent hearing losses were acute low-tone sensory hearing loss in 3, later attack of bilateral non-simultaneous sudden deafness in 4, and accidental incidence of sudden deafness in the hearing ear in 1. Low-tone hearing loss was supposed to be caused by consensual delayed endolymphatic hydrops. Prognosis of the low-tone hearing loss was fairly good with the exception of one case with recurrence one year later. However, outcome for bilateral sudden deafness was poor; only 1 of 4 improved. Hearing of the patient with accidental loss improved.

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