一側高度感音難聴における対側耳の聴覚障害

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  • Hearing Loss in Contralateral Ear in Patients with Unilateral Profound Sensorineural Hearing Loss.

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To investigate the mechanism of delayed endolymphatic hydrops (DEH), 404 patients with unilateral profound sensorineural hearing loss were analyzed. The cause of profound hearing loss, hearing level in the contralateral ear, time lapsed from the onset of hearing loss in the first ear to the opposite ear were retrospectively evaluated. Hearing loss in the contralateral ear with 30dB or more in at least one audiometric frequency was seen in 60% of the 404 patients, and 79 (20%) of them showed 60dB or more of average hearing level. It was found that 50 of the 404 were diagnosed as DEH and 26 (6%) of them were contralateral type. While 48, 065 patients visited our clinic due to all otorhinolaryngological diseases during the same period, and only 275 (0.6%) out of all the patients were diagnosed as Meniere's disease. The results suggested that contralateral-type DEH is not Meniere's disease unexpectedly occurred in the opposite ear with profound hearing loss but the first affected ear might play a role to cause contralateral hearing loss. It is indicated that patients with unilateral profound hearing loss might have a great risk of hearing disability in the opposite ear.

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