Abstract
We report two cases showing a temoporary threshold shift (TTS) in the aided ear. Case 1, a five-year-old boy, started wearing a hearing aid in the right ear. His right ear become progressively deaf after one week, so the hearing aid was removed and placed in the left ear. The right ear recovered to its former level, however the left ear become progressively deaf. Case 2, nine-year-old girl, used a body-worn hearing aid in the right ear since the age of three. She showed progressive deafness after changing to the behind-the-ear hearing aid. Therefore, the hearing aid was changed back to the body-worn hearing aid. After one month, her hearing recovered to its former level. It is suggested that the 1 kHz peak in the frequency response of the behind-the-ear hearing aid caused TTS. We point out the necessity of frequent audiometric testing and adequate management of hearing aids.
