While the resistance to flow offered by means of arterial narrowing and the collateral arteries are the major determinants affecting peripheral flow, there may be a contribution by those elements which affect the viscosity of the blood. To evaluate these factors, haematocrit, red blood cell aggregation and plasma viscosity were measured in 100 patients with occlusive arterial disease of the lower extremities. Disturbances in these parameters were noted and appeared to be related to the severity and extent of the occlusive disease. However, whether these factors contribute to the cause of intermittent claudication remains uncertain.
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