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Figure 2 The electrocardiograms of Patients #1 and #2 showing clinical ventricular tachycardias (VTs) originating within the pulmonary artery (PA) (panel I) and the electrocardiogram of Patient #1 showing pace mapping at the successful ablation site within the PA (panel II). In Patient #1, QRS complexes during pacing almost match those of the clinical VT.