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Am J Physiol Heart Circ Physiol 276: H257-H268, 1999;
0363-6135/99 $5.00
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Vol. 276, Issue 1, H257-H268, January 1999

Structured tree outflow condition for blood flow in larger systemic arteries

Mette S. Olufsen

Math-Tech and Department of Mathematics, Roskilde University, Roskilde 4000, Denmark

A central problem in modeling blood flow and pressure in the larger systemic arteries is determining a physiologically based boundary condition so that the arterial tree can be truncated after a few generations. We have used a structured tree attached to the terminal branches of the truncated arterial tree in which the root impedance is estimated using a semianalytical approach based on a linearization of the viscous axisymmetric Navier-Stokes equations. This provides a dynamic boundary condition that maintains the phase lag between blood flow and pressure as well as the high-frequency oscillations present in the impedance spectra. Furthermore, it accommodates the wave propagation effects for the entire systemic arterial tree. The result is a model that is physiologically adequate as well as computationally feasible. For validation, we have compared the structured tree model with a pure resistance and a windkessel model as well as with measured data.

arterial modeling; mathematical modeling; arterial outflow boundary condition


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