Arana-Rueda, Eduardo Change in QRS Morphology during Extrasystole Ablation: What is the Mechanism? [electronic resource] - Pacing and clinical electrophysiology : PACE Nov 2015 - 1351-4 p. digital Publication Type: Case Reports; Journal Article ISSN: 1540-8159 Standard No.: 10.1111/pace.12737 doi Subjects--Topical Terms: Cardiac Complexes, Premature--physiopathologyElectrocardiographyFemaleHumansMiddle Aged