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Abstract
Duplex transcranial scanning of intracranial segments of major arteries of the circle of Willis (middle and back), and V4 segment of spine cerebral arteries was performed in patients with hypothyroidism, associated with arterial hypertension and without it. The value of systolic blood velocity and vascular reactivity was
analyzed on the basis of functional tests for studying myogenic and metabolic mechanisms of blood vessels regulation. A decrease in systolic blood flow velocity in the middle cerebral artery was found on one side of the brain and both sides of the vertebral arteries. Hemodynamic disorders were accompanied by changes in vascular reactivity in 50% of patients, as evidenced by the appearance of negative (in 41.67%) and paradoxical (in 8.33%) reactions at metabolic dilatory test. The observed changes were more common in patients with hypothyroidism, combined with arterial hypertension.
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