Abstract
Twelve cases of acute sensorineural hearing loss induced by loud discotheque music are reported. Patients consisted of 4 men (7 ears) and 8 women (12 ears). Seven had bilateral and five had unilateral involvement. Dip-type hearing loss was observed in seven cases, while U-type, flattype, reversed U-type, and high tone loss type were also observed. In relation to age, most of the cases occurred in teenagers and those in their twenties. When the dip-type is compared with other types, it is more likely to occur bilaterally and sometimes after exposure to loud noises, but has a good prognosis. Other types are more likely to occur unilaterally following exposure to loud sounds, and have a poor prognosis. Therefore, the dip type and other types appear to have different pathogenese in the development of hearing loss. That is to say, the dip type is “delayed recovery NITTS” while other types are considered “PTS” because of their poor prognosis.
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