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To investigate the clinical, electrocardiographic and electrophysiological characteristics, and results of catheter ablation of left upper septal (LUS) premature ventricular complexes (PVCs) arising from the proximal left fascicular system. Thirty-one patients who had undergone radiofrequency catheter ablation (RFCA) for idiopathic PVCs were enrolled in the study. All PVCs presented with narrow QRS complexes (110 ms) with precordial QRS morphology of incomplete right bundle branch block type or identical to the sinus rhythm (SR) QRS