ディスコ難聴とその周辺　　アンケート調査のまとめ

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  • Hearing Loss After Exposure to Discotheque Sound

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Medical records on 83 patients with hearing loss induced by the exposure to discotheque sound were collected from 40 departments of otorhinolaryngology of main medical universities and major hospitals in Japan and analized.<br>The following results were obtained:<br>1. The peak incidence was found in the twenties. Male and female were equally affected.<br>2. The sources of noise exposure were concerts (39%), discotheques (26%), headphones (17%) and others. Most patients were listening to the rock and roll music. Average exposure time were three hours.<br>3. Most patients had some trigger mechanism before the onset of the disease. Many patients had long histories of listening to the noisy music in the past time.<br>4. Dip pattern hearing loss was mainly noted in younger patients with both ears affected. Low frequency hearing loss was noted in elderies with one ear affected.<br>5. Recruitment phenomenon was positive in all patients examined.<br>6. The prognosis of dip pattern hearing loss in young patients was favourable, while low frequency hearing loss of elderies was poor.<br>7. Steroid therapy had no beneficial effect on the prognosis.<br>It is thought that the causes of hearing loss may be mainly due to so-called “delayed recovery NITTS”, and low frequency hearing loss and others may be due to acute hearing loss of so-called “short term exposure of noise”.

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