Vestibular Rehabilitation and Unilateral/Bilateral Hypofunction Management
Principles of rehabilitation
Vestibular rehabilitation uses neuroplasticity through habituation, adaptation, and substitution. Habituation reduces symptoms by repeated exposure to provocative movements. Adaptation improves VOR gain with error-signal exercises such as gaze stabilization while turning the head. Substitution trains alternative strategies, including saccades, proprioception, and vision, especially in bilateral hypofunction. Gait and balance training address fall risk.
Unilateral hypofunction
After acute vestibular neuritis, early mobilization and gaze stabilization improve compensation. Static symptoms often resolve, but dynamic deficits persist, so exercises should be challenging but tolerable. Patients with uncompensated unilateral hypofunction may have oscillopsia and motion sensitivity. Medications that suppress vestibular function (meclizine, benzodiazepines) can impede compensation and should be limited after the acute phase.
Bilateral hypofunction
Bilateral loss causes oscillopsia and imbalance, worse in the dark or on uneven ground. Rehabilitation emphasizes substitution, balance training, and fall prevention. Patients should be counseled about visual dependence, night lighting, and avoiding slippery surfaces. Oscillopsia may improve with gaze stabilization, but recovery is often incomplete.
Common traps
Prescribing generic exercises without a diagnosis or baseline; overmedicating; failing to progress difficulty; ignoring anxiety and avoidance, which worsen outcomes. Another trap is expecting full recovery in bilateral loss.
Rule of thumb
Match exercise to deficit: habituation for motion sensitivity, adaptation for VOR gain, substitution for bilateral loss. Reassess with validated measures such as the Dizziness Handicap Inventory and dynamic gait index.