title: Narrow Complex Tachycardia: What is the Mechanism?
abstract: This article presents a diagnostic dilemma in which atrioventricular nodal reentrant tachycardia (AVNRT) and junctional tachycardia (JT) were differentiated based on tachycardia initiation with atrial extrastimulus as well as on the response to progressive decremental atrial extrastimuli. The progressive increase in A2H2' and H2H2' in response to atrial extrastimuli favors reentry as the mechanism of the tachycardia. This is a novel mechanistic differentiation of AVNRT from focal JT.
authors.affiliation: Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Faculty of Medicine and Medical Center, American University of Beirut, PO Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon. Electronic address: mr48@aub.edu.lb.
authors.forename: Marwan M
authors.initials: MM
authors.lastname: Refaat
authors.affiliation: Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California, 500 Parnassus Avenue, San Francisco, CA 94143, USA.
authors.forename: Melvin
authors.initials: M
authors.lastname: Scheinman
authors.affiliation: Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, University of California, 500 Parnassus Avenue, San Francisco, CA 94143, USA.
authors.forename: Nitish
authors.initials: N
authors.lastname: Badhwar
mesh_terms: D017115:Catheter Ablation; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D013613:Tachycardia, Ectopic Junctional / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D013617:Tachycardia, Supraventricular / Q000503:physiopathology
keywords: Atrioventricular nodal reentrant tachycardia; Catheter ablation; Junctional tachycardia