Abstract
Among hearing impaired children wearing hearing aids, some of them showed aggravation of hearing loss. The factors of the aggravation were investigated, and the following conclusions were found.1) The aggravation of hearing loss by hearing aids werea) resulted from gain even less than 40dB. In order to control maximum output sound pressure, Automatic Recruitment Control or Peek Clipping, etc. were needed in hearing aids because the cause is thought to be excessive input sound pressure.b) easily happened soon after hearing aids were changed.c) able to occure not only in ears with hearing aids but also in the opposite ears.2) When the aggravation were found, the interruption of using hearing aids was valuable.3) In order to find the aggravation earlier, the frequent hearing tests should be performed on the children wearing hearing aids.
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