Patients undergo vestibular function testing with video head impulse testing, sinusoidal harmonic acceleration testing, and pure tone audiometry and complete questionnaires throughout the study.

Non-interventional study

Assessed using standard vestibular function testing. Results will be aggregated to determine overall vestibular function. Results from baseline (prior to initiating immunotherapy) will be compared to results at 3, 6, and 12 months.

Assessed using Pure Tone Audiometry, a standard hearing test. Any change from baseline (prior to initiating immunotherapy) to 12 months will be reported.

The OSQ consists of 9 questions to assess visual environment sensation (episodes of oscillopsia). Questions are answered on a 5-point scale: always, often, sometimes, seldom, never. The OSQ is scored by calculating a mean item score, which results in a total score ranging from 1 to 5. A score of 3 or higher indicates moderate to extreme oscillopsia severity.