UNUSUAL LOCATIONS FOR ADENOSINE-SENSITIVE ACCESSORY ATRIOVENTRICULAR PATHWAYS WITH DECREMENTAL CONDUCTION

Introduction: Accessory AV pathways with decremental conduction are un common and, in particular, are thought not to occur at the anterior po rtion of the mitral annulus, Methods and Results: This report describe s successful catheter ablation in three patients with accessory AV pat hways that were adenosine sensitive and showed decremental conduction properties, The pathways were located at the anteroseptal, anteroparas eptal, and anterolateral aspects of the mitral annulus, Conclusion: Ac cessory pathways with decremental conduction do occur anywhere around the mitral annulus, even in the area of fibrous continuity between the aortic leaflet of the mitral valve and the aortic valve itself.