Computation of the Input Impedances of an Electric Catheter for Cardiac Plethysmography for a Spheroidal Model of the Left Ventricle

摘要

Electrical impedances between the electrodes of a catheter in a spheroidal model of the left ventricle were calculated analytically. The fields in the configuration are computed using eigenfunction expansions of the Laplace equation. For certain realistic combinations of specific conductances of the blood and the myocardium numerical results are given. These results either show the dependence of the impedances on the volume of the ventricle while keeping the length of the major axis of the ventricle constant, or show the impedances as a function of the length of the major axis, now keeping the volume of the ventricle constant.