The blood viscosity rises and falls from one extreme to the other with every cardiac cycle, comparable to blood pressure. Its viscosity changes with the applied shear stress. While serum or plasma viscosity measurements play an important role in the clinical management of patients prone to hyper-viscosity syndrome, these tests do not account for hematocrit, blood cell deformability or factors increasing RBC (red blood cell) aggregation. Elevated blood viscosity is a strong independent predictor of cardiovascular events. Blood viscosity is correlated with all known risk factors for cardiovascular diseases. It determines how much friction the blood causes against the vessels, how hard the heart has to work to pump the blood through the body, and how much oxygen is delivered to organs and tissue. ![]() The viscosity of blood is a direct measure of the ability of blood to flow through arteries and veins.
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