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Background To observe the electrocardiogram and 3-dimensional electroanatomic mapping and radiofrequency catheter ablation of patients with premature ventricular contractions (PVCs)originating from His region.Methods Between February 2009 and February 2011, 10 consecutive (5 male, 2 female) patients who underwent ablation for frequent PVCs originating close to His bundle region were referred to our hospital.Electroanatomic mapping of RVOT and ASC, ablation was performed with the 7F 4-mm-tip ablation catheter.