Key result
A proposed method to identify wavefront collision sites and improve the estimation of cardiac conduction velocity and isochrone maps was shown to be efficient in simulation results.
A novel computational method improves the estimation of cardiac conduction velocity and isochrone maps during complex arrhythmias with wavefront collisions.
Simulation-efficient wavefront collision detection refines conduction velocity estimates; leaves open in vivo validation before clinical mapping use.
Catheter ablation therapy is an effective approach to treat different arrhythmias. Cardiac conduction velocity (Cv), extracted from intracardiac electrograms, shows the speed and direction of the wavefront propagation at different sites and is an insightful feature to guide ablation therapy. To create a propagation map, a small mapping catheter with a high density of electrodes is usually used to sequentially collect electrograms from different sites in a desired chamber of the heart. The CV and isochrone surface estimations are very challenging during complex arrhythmias such as atrial fibrillation, where multiple wavefronts simultaneously excite different cardiac sites. Specifically, the performances of CV estimators significantly degrade at catheter sites where wave- fronts collide. This is mainly because during collision, different wavefronts pass the areas under different electrodes of the catheter. Consequently, the activation times of the electrodes are the results of different wavefronts, and there are sharp changes in isochrone line patterns in the vicinity of the collision's border. In this paper, we propose a method that is able to identify the collision sites and improve the estimation of CV and isochrone maps. The proposed method finds the electrodes of the catheter that are excited by a similar wavefront and then estimates the corresponding isochrone lines for that wavefront. Our simulation results confirmed the efficiency of the proposed method during collision.
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Shariat et al. (2018) studied Arrhythmias (Atrial fibrillation). Proposed method for conduction velocity and isochrone map estimation was evaluated on Efficiency of the proposed method during wavefront collision. A proposed method to identify wavefront collision sites and improve the estimation of cardiac conduction velocity and isochrone maps was shown to be efficient in simulation results.
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