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Background It has been reported that the origin site of idiopathic ventricular arrhythrnias from left or right outflow tract (L/RVOT) can be judged from the transition of R/S on precordial lead of surface ECG, but its value still need to be confirmed in more studies.This study reports the relationship between surface ECG and the origin of the premature ventricular contractions (PVCs) or ventricular taehycardia (VT) in a large series.