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Electroanatomic Mapping of Human Heart:

A patient with dilated cardiomyopathy presented with sustained ventricular tachycardia (VT). Detailed endocardial electroanatomic map (CARTO, Biosense Webster, Diamond Bar, CA, USA) of the right ventricle (RV) and left ventricle (LV) did not show any area(s) with reduced electrogram voltage (<2.0 mV; Fig. left, panel A). The predominant VT was mapped (activation and pace mapping) endocardially to basal inferolateral LV, but despite ablation with a cooledtip catheter (Boston Scientific, Watertown, MA, USA; maximum temperature 35◦C; impedance drop 10–15 ; duration 90 sec) it remained inducible. The procedure was reattempted with percutaneous pericardial access 72 hours later.