[A model of spherical quasi-epicardium for mapping of the electrical potential of the heart]. / Model' sfericheskogo kvasiépikarda dlia otobrazheniia élektricheskogo potentsiala serdtsa.

ABSTRACT

Possibility of determination of the heart electric potential maps on the spherical quasiepicardium from the body surface potentials measured by means of multiple leads, is estimated. The simplified models of ventricular depolarization electric generator considered in this study, consist of sets of uniform double layers representing basic configurations of the true electric generator of the heart, while allowing an analytical calculation of the multipole components, as well as potential of the generator. The contribution of the generator multipole components to the potential on the spherical quasiepicardium is evaluated. The results of the study show that it is reasonable to use the multipole components up to the 3rd order for noninvasive mapping of the potential on the spherical quasiepicardium with the radius which provides tangential touching of the quasiepicardium with the precordium surface. Because of bringing the potential observation region nearer to the generator and improving concentricity of this region with respect to the generator, the quasiepicardium mapping technique allows revealing much more complicated generator configurations than those found out by straightforward estimation of the potential measured on the chest surface, thereby facilitating more accurate noninvasive recognition of the heart electrophysiological state.