CST – Computer Simulation Technology

Erythrocyte orientation and lung conductivity analysis with a high temporal resolution FEM model for bioimpedance measurements
Mark Ulbrich, jens Mühlsteff, Piotr Paluchowski, Steffen Leonhardt
IWIS 2011: International Workshop on Impedance Spectroscopy, Chemnitz, Germany, 28-30 September 2011; authors version
1st January 0001
Impedance cardiography, finite element simulations, aortic wave propagation, lung perfusion, erythrocyte orientation
Impedance cardiography (ICG) is a simple and inexpensive method to acquire data on hemodynamic parameters. In this work, the influence of three dynamic physiological sources (aortic wave propagation, lung perfusion and erythrocyte orientation) is analyzed using a model of the human thorax with a high temporal resolution. Simulations are conducted using the finite element method with a temporal resolution of 125 Hz. The ICG signal caused by wave propagation on the aorta shows good agreement with the measured signals (r = 0.75). In addition, it is shown that lung perfusion and erythrocyte orientation have a high impact on the signal, altering the maximum of the curve as well as the characteristic points used to calculate hemodynamic parameters, such as left ventricular ejection time.

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