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New unilateral hearing loss.
Focal neurological signs (facial weakness, diplopia, limb weakness).
New-onset headache.
Normal head thrust test.
Diagnostic certainty Criteria Definite ≥2 spontaneous episodes of vertigo lasting 20 minutes to 12 hours
Audiometrically confirmed low-to-medium-frequency sensorineural hearing loss in one ear, before/during/after an episode of vertigo
Fluctuating aural symptoms (fullness, tinnitus, hearing loss) in affected ear
Not better accounted for by another diagnosis
Probable ≥2 spontaneous episodes of vertigo lasting 20 minutes to 24 hours
Fluctuating aural symptoms (fullness, tinnitus, hearing loss) in affected ear
Not better accounted for by another diagnosis