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Departments of Neurology (Dr. Baloh and Ms. Jacobson) and Surgery (Head and Neck) (Drs. Baloh, Honrubia, and Ms. Jacobson), UCLA School of Medicine, Center for the Health Sciences, Los Angeles, CA.
We report the clinical and oculographic features in 240 patients with benign positional vertigo (BPV). In each case, after a rapid position change from the sitting to head-hanging position, a stereotyped torsional paroxysmal positional nystagmus was visually observed and recorded with electronystagmography (ENG). The mean age of onset was 54 years, with a range of 11 to 84 years. In slightly more than one-half of the cases (122/240) a likely diagnosis was determined. The most common identifiable causes were head trauma (17%) and viral neurolabyrinthitis (15%). Females outnumbered males approximately two to one in the idiopathic group. Abnormalities on bithermal caloric testing were found in 47% of patients. Only two patients, both with well-documented neurologic disorders, had central signs on ENG. Our data are consistent with a peripheral, posterior semicircular canal origin of BPV.
Address correspondence and reprint requests to Dr. Baloh, Department of Neurology, Reed Neurological Research Center, UCLA School of Medicine, Los Angeles, CA 90024.
Received March 25, 1986. Accepted for publication in final form June 24, 1986.
Supported by NIH Grants NS 09823 and EY 04556.
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