Panel A depicts epicardial (left) and endocardial (right) voltage map in the left lateral view in a patient with non-ischaemic cardiomyopathy. Panel B shows an epicardial activation map during sinus rhythm with delayed activation on the basal lateral wall (violet colour) with marked PF ablation tags (green). Note that the late potentials on both epicardial and endocardial local electrograms were eliminated by PF epicardial ablation. At the same time, the endocardial voltage was not affected. Panel C depicts mid-diastolic potentials in epicardium during inducible VT. Panel D shows the termination of VT during epicardial PF ablation. During PF application, note the myocardial capture (visible on ECG and arterial pressure tracing).