Hyperacusis in Bell's palsy.

概要

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It has been generally accepted that stapedial muscle dysfunction is the cause of hyperacusis in Bell's palsy. However, the acoustically evoked stapedial reflex (AR) revealed by the tympanometric test is not always negative in patients with hyperacusis. The AR was negative in 64.7% of our 278 patients with Bell's palsy of recent onset, while only 19.1% complained of hyperacusis. In order to explain this discrepancy, the auditory tests, Bekesy audiometry, ABLB, SISI test and ABR, were carried out in 13 selected patients. No evidence of retrocochlear disturbance was found.Although the underlying pathophysiological mechanism of hyperacusis has remained uncertain, we could not exclude the possibility of a false negative AR measured by conventional tympanometry or the contribution of tensor tympani muscle function when hyperacusis and AR results are contradictory.
耳鼻咽喉科臨床学会の論文