Abstract
A slowing of the blood flow rate (BFR) is one of the earliest signs of circulatory insufficiency. In 1935, oxyhemometric determination of the velocity of blood flow in the small circle of circulation was proposed. Although the pulmonary-ear SC determination method includes the areas of the large and small circulatory circle, it mainly characterizes the blood flow through the pulmonary vein system - from the pulmonary capillaries to the left ventricle. Blood from aorta reaches ear capillaries very quickly due to high velocity of movement through arterial system, so this time can be neglected. The oxyhemometric and isotopic methods have been shown to give similar results. The oxyhemometric method for determining SC in the small circle is considered to be the best.
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