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Yes, some vestibular disorders are by essence less responsive to vestibular rehabilitation than others. The principle of vestibular rehabilitation is to decrease symptoms by training the brain to optimize the use of the inner-ear input and to integrate that input effectively with the visual and proprioceptive information. Sudden changes in inner ear function can produce severe symptoms of vertigo and vomiting but once the inner ear function stabilizes, the brain can be trained to readjust to it.
However, if the nature of the vestibular disorder is to fluctuate or to deteriorate progressively, it can be extremely challenging for the brain to adjust to these repetitive changes. Individuals suffering from Ménière’s disease, for example, are not good candidates for vestibular rehabilitation when they are going through active stages of the disorder in which spells are happening often. Patients with recurrent types of vestibular disorders often benefit more from medical management of the attacks than from vestibular rehabilitation.
One vestibular disorder that does not classically fluctuate but also does not respond well to vestibular rehabilitation is superior canal dehiscence. In cases not treated surgically, avoidance of triggers remains the best management strategy; for example, patients should avoid exposure to loud sounds that can trigger dizziness or imbalance.