SPHERICAL-QUASIEPICARDIUM MODEL FOR MAPPI NG OF THE HEART ELECTRIC-POTENTIAL

Possibility of determination of the heart electric potential maps on t he spherical quasiepicardium from the body surface potentials measured by means of multiple leads, is estimated. The simplified models of ve ntricular depolarization electric generator considered in this study, consist of sets of uniform double layers representing basic configurat ions of the true electric generator of the heart, while allowing an an alytical calculation of the multipole components, as well as potential of the generator. The contribution of the generator multipole compone nts to the potential on the spherical quasiepicardium is evaluated. Th e results of the study show that it is reasonable to use the multipole components up to the 3rd order for noninvasive mapping of the potenti al on the spherical quasiepicardium with the radius which provides tan gential touching of the quasiepicardium with the precordium surface. B ecause of bringing the potential observation region nearer to the gene rator and improving concentricity of this region with respect to the g enerator, the quasiepicardium mapping technique allows revealing much more complicated generator configurations than those found out by stra ightforward estimation of the potential measured on the chest surface, thereby facilitating more accurate noninvasive recognition of the hea rt electrophysiological state.