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Figure 4 Recordings from the distal poles of the mapping catheter (Map dist) located at a site in the posteroseptal left ventricle where a Purkinje potential precedes the QRS complex by 20 ms during sinus rhythm (A) and by 35 ms during ventricular tachycardia (VT) (B). Pace mapping performed at this site during sinus rhythm (C), shows a match with the VT morphology (D).