Click on image to view larger version.

Figure 2 Three-dimensional voltage CARTO (Biosense-Webster Inc.) map of the left ventricle in a patient who underwent ablation for ventricular fibrillation storm and also had a left ventricular assist device (LVAD). Red regions on the map represent scar, whereas green and blue regions represent abnormal tissue in the scar border zone. Purple indicates normal voltage >1.5 mV. The red circle indicates the site where premature ventricular contractions preceded by high frequency Purkinje-like potentials were mapped and successfully ablated. The ablation site is located along the edge of the scar region in the border zone. MA = mitral annulus.