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Figure 5 Example of a successful ablation of an idiopathic ventricular tachycardia from the pulmonary artery (PA). (A) Shown are both unipolar (Abl uni) and a sharp bipolar (Abl bi) electrograms from the ablation catheter positioned at the PA. RVA = right ventricular apex. (B and C) Right ventricular electroanatomic activation maps including the proximal part of the pulmonary artery are shown, with red color indicating the earliest activation time. Gray color represents schematically the region of the pulmonary valve (PV). The dark red dot represents the successful ablation site (ABL) in the pulmonary artery. RVOT = right ventricular outflow tract; TA = tricuspidal annulus. (D and E) Radiograms show the successful ablation site. LAO 60° = left anterior oblique view; RAO 30° = right anterior oblique view.