Medical Management of the Near-Narrowed Internal Auditory Canal Pathology in the Adult Population: A Preliminary Study

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Background/Objectives: Objective: To discuss therapeutic outcomes in patients with symptomatic near-narrow internal auditory canal (NNIAC). Methods: We retrospectively analyzed the records of 26 symptomatic patients diagnosed with NNIAC, who had been treated with anti-epileptic drugs. In addition to clinical and radiological data, we recorded I–III latencies of auditory brainstem responses prior to and after medical therapy. Results: Among a total of 48 patients with NNIAC, 26 patients were included. Oxcarbazepine, Gabapentin, and Lamotrigine were prescribed among 19 (73%) patients, 6 (23%) patients, and 1 patient (4%), respectively. After treatment, 24 (92.3%) patients described improvement of vestibular symptoms, and 16 (76.2%) reported improvement of auditory symptoms. After treatment with antiepileptic drugs, ipsilateral IPL I-III latencies decreased (less than 2.3 ms) in 16 (84.2%) patients (23 ears out of 42). Conclusions: A low dose of anti-epileptic monotherapy for NNIAC could be effective over the long term and is generally well-tolerated. Further studies are needed to provide more solid evidence of the efficacy and safety of anti-epileptic drugs on a larger number of patients with NNIAC.

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