Accurate estimations of potentials and activation times between electrode sites are important for cardiac mapping with limited numbers of electrodes. The accuracy of these estimates was investigated for two spacings between unipolar electrodes. A surgical model, which allowed separate pacing of the right and left ventricles and prevented the propagation of activation wavefronts between them, was used to produce right ventricular unipolar epicardial electrograms which represented either local activation of the right ventricle or distant activation of the left ventricle. Electrograms recorded from the corners of 0. 7 and 1. 0 cm squares were used to estimate electrograms for the centers of the squares. The potentials and activation time of each estimated electrogram were compared to the potentials and activation time actually measured at the center site. Interelectrode spacing of 1. 0 cm resulted in significant errors in estimating potentials and activation times during local activation (RV pacing) but not when the sources were distant (LV pacing).
|Number of pages||4|
|State||Published - Dec 1 1985|