[Study of a mobile multipolar equivalent generator of the human heart]

Multipolar expansion convergence can be improved by changing the structure of the model. The generator is not fixed in a certain point but is supposed to move along the electric heart centre trajectory during the cardiac cycle. Six normal subjects and three patients who had severe myocardial infarction with specific changes in ECG were studied. In all the cases, the dipole and quadrupole contributions to the averaged ECG potential of the thoracic surface were determined. With replacement of an immovable model by a movable one, the mean square quadrupole contribution was found to decrease drastically, i. e. considerable improvement of the multipole expansion convergence has been observed. Therefore, the model of the equivalent generator moving along the heart electric centre trajectory appears to be one of the most promising models and is to be specially studied in the clinic.