Abstract
Electromagnetic flowmeters are commonly used for measuring blood flow and there have been varying reports of their dependence upon erythrocyte concentration. We have shown recently, in carefully controlled experiments, that flowmeter sensitivity is indeed changed by haematocrit (DENNIS and WYATT, 1969). We have found that when the flow is turbulent the sensitivity is hardly affected, but with laminar flow the sensitivity is reduced with increasing haematocrit. A typical result is shown in Fig. 1, where we see that in this particular case, with a flow of 250 ml min-1 in a 6 mm dia. tube, the sensitivity falls by 4% as the haematocrit is increased from 0 to 66%.
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References
DENNIS, J., WYATT, D.G.: Circulation Res. 24, 875 (1969).
SHERCLIFF, J.A.: The Theory of Electromagnetic Flow Measurement, Cambridge: University Press (1962).
VELICK, S.E., GORIN, H.G.: J. Gen. Physiol. 23, 753 (1939).
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© 1971 Springer-Verlag Berlin · Heidelberg
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Wyatt, D.G. (1971). Dependence of Electromagnetic Flow Meter Sensitivity upon Cell Distribution and Orientation. In: Hartert, H.H., Copley, A.L. (eds) Theoretical and Clinical Hemorheology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65156-4_37
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DOI: https://doi.org/10.1007/978-3-642-65156-4_37
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