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Novel Form of Atrial Tachycardia Originating at the Atrioventricular Annulus
Author(s) -
NOGAMI AKIHIKO,
SUGUTA MASAHIKO,
TOMITA TOMOYUKI,
NAITO SHIGETO,
TANIGUCHI KOICHI,
AONUMA KAZUTAKA,
IESAKA YOSHITO
Publication year - 1998
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1998.tb00051.x
Subject(s) - medicine , cardiology , tachycardia , sinus rhythm , atrial tachycardia , catheter ablation , atrioventricular reentrant tachycardia , ablation , atrial fibrillation , accessory pathway
We report two patients with reentrant atrial tachycardia that originated at the AV annulus. Atrial tachycardia originated in the posterior portion of mitral annulus in one patient (case 1) and the posterolateral portion of tricuspid annulus in one patient (case 2). Tachycardia was successfully eliminated by RF catheter ablation in both patients, with the catheter placed underneath the mitral valve in case 1 and on the tricuspid annulus in case 2. Spiky potentials were recorded in the diastolic phase of the atrium during tachycardia at the sites of successful ablation. Spiky potentials were also recorded after atrial electrogram during sinus rhythm, and showed decremental properties during atrial pacing. An accelerated atrial rhythm was observed during RF application, and tachycardia could not be induced after ablation in either patient. Tachycardia in these patients seemed to be due to reentrant tachycardia originating in the accessory AV node (Mahaim fiber) without ventricular connection.