Bone Anchored Hearing Aids for the Treatment of Asymmetric Hearing Loss.

OBJECTIVES: Asymmetric hearing loss is generally defined as a moderate-to-profound hearing loss in the poorer ear and a mild-to-moderate hearing loss in the better ear. Application of a bone conduction hearing aid is one of the possible treatments for the poorer ear in asymmetric hearing loss. However, the device essentially stimulates the contralateral better ear, precluding true binaural hearing. The aim of this paper is to evaluate the application and utility of bone-anchored hearing aids in the treatment of asymmetric hearing loss. MATERIALS AND METHODS: We retrospectively evaluated 215 implanted subjects in our clinic and extracted a series of 27 patients affected by asymmetric hearing loss and treated with bone-anchored hearing aids. All 27 subjects had a mixed hearing loss after middle ear surgery. The preoperative and postoperative audiological data of these patients were collected and analyzed. RESULTS: The audiological tests showed an improvement in the performance of hearing perception of sound and speech in quiet and noise. Moreover, the subjects have positively answered the questionnaires administered to evaluate subjective benefits. All subscales of the abbreviated profile of hearing aid benefit and speech, spatial, and qualities of hearing scale showed a significant improvement with the device. CONCLUSION: Bone-anchored hearing aids are a suitable treatment for asymmetric hearing loss. When other devices cannot be utilized or are not indicated, the bone conduction devices may allow good audiological results.