the invention relates to medicine , namely to cardiology , cardiovascular surgery , functional diagnosis and clinical electrophysiology of the heart . the invention consists in reconstructing electrograms , whose experimental registration requires an invasive access , by computational way on unipolar ecgs recorded at 80 and more points of the chest surface . based on reconstructed electrograms , isopotential , isochronous maps on realistic models of the heart are constructed , the dynamics of the myocardium excitation is reconstructed and electrophysiological processes in the cardiac muscle are diagnosed . application of the method allows one to improve the accuracy of non - invasive diagnosis of cardiac rhythm disturbances and other cardio - vascular diseases .