Hereditary cerebellar degeneration with downbeat nystagmus. A case and it's treatment

Abstract
We present a female patient of 48 years with downbeat nystagmus (DBN), moderate impairment of coordination testing and a family history of cerebellar ataxia. We report that a single 2 mg dose of clonazepam (following Currie and Matsuo1) resulted in a virtual disappearance of nystagmus and of the patient''s symptom of oscillopsia. This result is interpreted in terms of current models of DBN.

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