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PURPOSE We report new electrocardiographic criteria (ECG) for localizing premature ventricular complexes (PVCs) originating from the base of the left ventricle (LV). METHODS QRS deflection (positive negative or negative positive) in lead aVR and aVL respectively, were evaluated in 41 PVC/VT cases. RESULTS There were a total of 41 patients, age 64 ± 11 years. Twelve patients had QRS deflection in aVR which were completely opposite to the deflection in aVL. If the PVC originated from basal septum, aVR was negative while aVL positive and vice versa when it was