Successful treatment of hyperventilation-induced nystagmus in vestibular schwannoma with oxcarbacepine

A 67-year-old-man suffered from attacks of rotatory vertigo and oscillopsia over a period of six months, which could be reproducibly elicited by physical activity. Symptoms ceased rapidly after the patient got to rest for a few minutes. Clinical examination revealed a mixed, clockwise torsional nystagmus with a horizontal component toward the patient's right 30 seconds after hyperventilation and ceasing about one minute after hyperventilation. MRI disclosed an enhancing mass in the right cerebellopontine angle without progression during follow up over 6 months. No specific surgical intervention was performed and…