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Abstract
In this work the investigations of the electrical field generated by the heart, carried out using a computer simulation method are presented. Two models have been constructed approximating the chest region for the following conditions: (a) normal heart activity, and (b) open chest during the cardiac surgery. For the above models the distribution of potentials on the heart surface are determined. The source field investigated takes the following forms: dipole, multidipole, and multipole. Numerical experiments for these models show a difference between normal heart activity and of the heart in the condition when the chest is open during surgery.