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Clinical and Electronystagmographic Features in 84 Cases

Anton Grad, MD; Robert W. Baloh, MD

Arch Neurol. 1989;46(3):281-284.

Abstract
• We reviewed the clinical and electronystagmographic findings of 84 patients who presented to our neuro-otology clinic with vertigo of presumed cerebrovascular origin. There was a surprisingly high incidence of isolated episodes of vertigo (abrupt in onset, lasting minutes). In some patients these episodes preceded other symptoms of vertebrobasilar insufficiency or infarction by months. Peripheral vestibular abnormalities were common on electronystagmographic testing; 42% had unilateral hypoexcitability to caloric stimulation. We conclude that the vestibular labyrinth is selectively vulnerable to ischemia within the vertebrobasilar system.

Author Affiliations
From the Department of Neurology, Reed Neurological Research Center, UCLA School of Medicine. Dr Grad is now with University Medical Center, Ljubljana, Yugoslavia.

Footnotes
Accepted for publication Sept 19, 1988.

Reprint requests to Department of Neurology, Reed Neurological Research Center, UCLA School of Medicine, Los Angeles, CA 90024-1769 (Dr Baloh).

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