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Abstract
In 507 vertigo cases in which circulatory velocity in the vertebral artery was determined, using ultrasonic blood rheography, the results in 150 cases (32%) were abnormal, falling appropriately into a laterality group and a lower group. Twenty-one patients whose clinical course was followed up showed a decrease in the side difference of their circulatory velocity, with consequent improvement in their vertigo. VBI demonstrated a poorer prognosis for the laterality group than for the normals, thus indicating a positive correlation between side difference and the effect of fluctuating blood pressure on serum lipids. Certain antivertiginous drugs had a beneficial effect on side difference, increasing the circulatory velocity.