The aim of our study was to identify clinical criteria for optimizing rehabilitation of patients with unilateral deafness using the Baha device. We made a retrospective study of 102 patients with unilateral deafness requesting auditory rehabilitation over a period of 5 years. All subjects underwent a series of stereo audiometric tests, with and without Baha worn on a headband, and were then referred to a hearing care specialist for a real life trial of 15 days. The Glasgow Health Status Inventory (GHSI) questionnaire was administered. Patients refusing the implantation were retrospectively submitted to a questionnaire specifically designed to ask the reasons for refusal. We measured stereo audiometric test results, age, aetiology of deafness, duration of auditory deprivation on the rehabilitated ear, and GHSI score. At the conclusion of testing, the implantation rate was 29%. During preoperative testing, the improvement in understanding of speech-in-noise was 22 ± 11% for patients agreeing to the implantation versus 13 ± 11% for patients refusing the implantation. Age, aetiology of deafness and duration of auditory deprivation had no influence on the implantation decision. Speech-in-noise testing and aided stereo audiometric gain were the only two measures showing statistically significant differences between the groups agreeing to and refusing the implantation. There were multiple reasons for refusal of the implantation. Among these, the four principal reasons were: absence of perceived benefit during stereo audiometric testing (59%), requirement for surgery (35%), cost of the solution (44%), and aesthetics (41%). Hence, no other criteria except the preoperative improvement in understanding of speech-in-noise and the aided gain from Baha worn on a headband were found to be predictive of the patient's acceptance of surgical implantation of a bone-anchored implant/abutment for Baha. Speech-in-noise testing with and without Baha worn on a headband has a role to play in deciding on the implantation of a bone-anchored hearing solution.
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