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  1. Supraventricular Tachycardia Initiated by Couplets of Atrial Extrasystoles but Not by Single Premature Atrial Beats: What Is the Mechanism?
  2. An Unusual Narrow QRS Complex Tachycardia: What Is the Mechanism?
  3. Changes in QRS morphology during atrial fibrillation: What is the mechanism?