A 39-year-old man was admitted to the ENT department with a four-year history of fluctuating bilateral Mixed or sensorineural hearing loss (SNHL), associated with acute objective vertigo, nausea, and vomiting (4–8 episodes/year); the vertigo attacks, lasting from 15 minutes to three hours, were often accompanied by a headache. The patient had no history of acoustic trauma and/or noise exposure. Which further investigations should be advised?

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