[Changes in the blood flow velocity in the capillaries of the rat cerebral cortex in acute massive blood loss].

A statistically significant drop in the blood flow velocity in capillaries of the rat cerebral cortex occurred in 50-60% loss of the blood volume: from 1.32 +/- 0.1 mm/sec to 0.2-0.8 mm/sec even in 30-40% loss, resp. A more massive blood loss (50-60%) decreased the blood flow velocity with no subsequent restoration. Aggregates of elements were formed in the capillaries with subsequent hemostasis in this part of the vessel.