FIELD: medicine. SUBSTANCE: method involves applying hyperventilation test. Brachial artery diameter is repeatedly determined. Per cent ratio of the obtained diameter is calculated on hyperventilation test peak at the fifth minute (I) and seventy fifth second with hyperemia (II) of to the initial value. Vascular reactivity index is determined as I to II ratio. The value being greater than 0.3, pathological vascular reactivity is diagnosed. EFFECT: complete description of peripheral vascular reserve conditions. 4 tbl
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