Objective: NF2-related schwannomatosis (NF2) is characterized by bilateral vestibular schwannomas (VS), often causing severe damage to the bilateral auditory function. Auditory brainstem implantation (ABI) provides hearing-impaired patients with an opportunity to reacquire auditory sensation through electrical stimulation of auditory neurons in the cochlear nucleus. However, ABI is not covered by public health insurance in Japan, leading to a large difference in financial burden compared to cochlear implantation (CI). The aim of the present study was to demonstrate the effectiveness of CI as an alternative to ABI for hearing reacquisition in patients with profound hearing loss caused by VS.
Methods: To investigate the current situation of ABI and CI for hearing reconstruction in VS patients, we conducted a questionnaire survey of 102 facilities in Japan. Based on the responses to the questionnaire, a multicenter research group consisting of otolaryngologists and neurosurgeons was established. We collected detailed data on patients with VS who underwent ABI (n = 7, all NF2) and CI (n = 14 [nine NF2, and five non-NF2]).
Results: Some sense of hearing was obtained in all patients but one with CI indicating the efficacy of CI and ABI for profound hearing loss caused by VS. The mean hearing levels were 45.4 dB HL in the ABI patients and 32.7 dB HL in the CI patients, indicating that CI was effective as an alternative to ABI.
Conclusion: The results of the present study suggest the effectiveness of CI as an alternative to ABI for hearing reacquisition in patients with profound hearing loss caused by VS.
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