Electroanatomical voltage map of the left ventricle (Ensite Precision, Abbott) in a patient with anteroseptal aneurysm and electrical storm. Left panel shows lesion set that modified the substrate, achieved core isolation and non-inducibility of VT. Right panel displays endocardial signals from the multipolar mapping catheter (HD grid) and CS. Arrow marks the dissociation of the signal in the isolated region. ECG, electrocardiogram. CS, coronary sinus.