Simulation of Measured Body Surface Potential Map During Early Right Ventricular Pacing

The ability of cellular automaton activation propagation heart model to simulate ventricular depolarization started in a single point was investigated using a patient-specific geometry. Body surface potential maps (BSPMs) measured during stimulation by a catheter in the right ventricle were recorded in 116 leads on the patient torso. Patient's ventricular model was used to simulate the initial depolarization started in positions close to the catheter position and corresponding BSPMs were computed. Correlations between the recorded and simulated BSPMs were computed during 20 ms at the beginning of the activation. The best mean correlation between the measured and simulated BSPMs was 0.89 or 0.91 for homogeneous or inhomogeneous torso model, respectively. The distance between the real position of the stimulating catheter and the starting points used for the best BSPMs was 23 or 22 mm. The simulations using the proposed model could serve for additional verification of the results obtained by the inverse solution when finding the origin of premature ventricular activation.