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Neurology 1999;53:1576
© 1999 American Academy of Neurology
Brief Communications

The effect of hyperventilation on downbeat nystagmus in cerebellar disorders

Mark F. Walker, MD and David S. Zee, MD

From the Departments of Neurology and Ophthalmology (Dr. Walker) and the Departments of Neurology, Ophthalmology, Otolaryngology, and Neuroscience (Dr. Zee), Johns Hopkins University School of Medicine, Baltimore, MD.

Address correspondence and reprint requests to Dr. Mark Walker, Department of Neurology, Johns Hopkins Hospital, Pathology 2-210, 600 N. Wolfe Street, Baltimore, MD 21287; e-mail: mwalker{at}dizzy.med.jhu.edu

Hyperventilation can affect nystagmus in patients with vestibular disorders. However, the effects on nystagmus in patients with cerebellar disease have not been systematically studied. Using the magnetic field search coil technique, we studied the effects of hyperventilation on nystagmus in a series of cerebellar patients. In four of eight patients, hyperventilation produced an increase in the slow-phase velocity of downbeat nystagmus. We speculate that this effect may be mediated through metabolic effects on cerebellar calcium channels.

Key words: Hyperventilation—Nystagmus—Downbeat nystagmus—Cerebellum.




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