Figure 3. Electroanatomical mapping – The electroanatomical propagation map showing activation for the same epicardial area of the lateral left ventricle in a representative animal. At baseline (A), homogenous and rapid activation is demonstrated. There is disruption of conduction as evidenced by clustering of isochrones following ablation (B). Following injection of conductive hydrogel (C), a bridge of improved conduction is restored across the ablated myocardium. Red dots indicate site of ablation, purple dots indicate border zone of abnormal myocardium as determined by voltage (<1.5 mV), and block dots indicate sites of needle entry for hydrogel injection. LAT=local activation time.