Studying the reversible aggregation of red blood cells (RBC), which is one of the main factors determining the blood microcirculation is of importance for modern cardiology because the widespread application of different antiplatelet agents and anticoagulants in clinical practice may affect the blood rheology also via the alteration of RBC aggregation. Administration of the antiplatelet and anticoagulants agents into blood is based on general assumptions about the average doses of the drug, which often do not fully comply with the requirements of the personalized medicine. In this work, we compare the blood aggregation properties measured by laser aggegometry techniques in-vitro in blood samples with the properties of blood rheology measured with digital capillaroscopy in-vivo in the nail beds capillaries of patients suffering from the coronary heart disease (CHD). We demonstrate the impairment of these properties and high correlation of their alterations for patients suffering from the CHD with different stages of rheology disorders. Good agreement between the results obtained with the used diagnostic techniques, laser aggregometry, laser tweezers and digital capillaroscopy, and their applicability for the diagnostics of abnormalities of rheological properties of blood are demonstrated.
Microrheological parameters of red blood cells (RBCs) and blood viscosity were studied by different optical and rheometric techniques. Measurements were performed under in vitro condition both on the EDTA-stabilized whole blood samples at various temperatures and on the RBCs in autologous serum without platelets at different concentrations of proaggregant macromolecules (Dextran 150, Dextran 500 and albumin). The nonlinear dependences of the aggregation parameters on the concentration of the proaggregant macromolecules in autologous serum were observed. Rheometry of human whole blood samples demonstrates a power law dependence of the suspension viscosity on temperature at such shear rates that allow the RBC aggregation. We assume that there may be an unaccounted temperature dependent synergetic effect of plasma proteins/macromolecules on RBC aggregation and interaction and, consequently, on the blood viscosity.
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