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Article type: Research Article
Authors: Stadler, Achim A. | Zilow, Eugen P. | Linderkamp, Otwin
Affiliations: Division of Neonatology, Department of Pediatrics, University of Heidelberg, D-6900 Heidelberg, Federal Republic of Germany
Note: [] Accepted by: Editor P. Gaehtgens
Abstract: Blood viscosity in normal adults was measured in glass tubes with diameters of 50, 100 and 500 μm for a wide range of adjusted feed hematocrits (15-70%). Blood viscosity decreased at each of the adjusted feed hematocrits when going from a 500-μm tube to a 50-μm tube. The viscosity reduction increased with increasing hematocrit. The steepness in the hematocrit-viscosity curves decreased with decreasing tube diameter. Erythrocyte transport efficiency (hematocrit / blood viscosity) was calculated to estimate the optimal hematocrit for oxygen transport. Optimal hematocrit averaged 38% in 500-μm tubes, 44% in 100-μm tubes and 51% in 50-μm tubes. Our results suggest that the strong Fåhraeus-Lindqvist effect at high hematocrits may help to maintain oxygen transport in polycythemic patients as long as the driving pressure is sufficient.
Keywords: Blood viscosity, hematocrit, oxygen transport, red blood cell (RBC)
DOI: 10.3233/BIR-1990-27513
Journal: Biorheology, vol. 27, no. 5, pp. 779-788, 1990
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