Vestibular disorders caused by circulatory insufficiency in the vertebral-basilar system (PBS) indicate isolated or concomitant conditions of acute ischemia of the structures of the inner ear and the VIII nerve root, as well as symptoms of their chronic ischemic lesion. Peripheral dizziness and nystagmus observed in vascular disorders occurring against the background of atherosclerosis and hypertension may be the earliest symptoms of the disease, and therefore their adequate diagnosis is extremely important.