- 一般社団法人 日本耳鼻咽喉科学会
- 日本耳鼻咽喉科学会会報 (ISSN:00306622)
- vol.80, no.7, pp.729-731, 1977
The patient was a 21-year-old man who acquired unilateral deafness while he was exposed to extremely loud sound of discotheque for about 4 hours.<br> His hearing type was of a dish, with a mean hearing loss of slightly over 50 dB in the middle frequencies. He was positive for recruitment phenomenon. No abnormal temporary threshold tone decay could be observed. He received treatment for approximately 2 months with slight improvement in hearing. Only 10 dB was elevated in frequencies of 500 Hz or below during treatment.<br> He had no subjective symptoms such as vertigo, dizziness and giddiness, nor any abnormal findings in equilibrium tests.<br> He was diagnosed as noise-induced sudden deafness caused by the sound of discotheque.