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The rheological properties of blood and deformability of erythrocytes were investigated in 85 patients with acute diffuse peritonitis. It was found that higher viscosity of blood mainly with slow shift rates were observed in the reactive and toxic phases of the disease. In the reactive phase these changes can be considered as adaptational, in the toxic phase--as pathological ones. Lessened viscosity in the terminal phase of the disease is an unfavorable prognostic sign.
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