Ablation of atrioventricular nodal reentrant tachycardia in a patient with reversal of slow and fast pathways inputs into the atrioventricular node.

We report a case of atrioventricular nodal reentrant tachycardia (AVNRT) coexistent with His bundle anomaly and atrial septal defects. The His-bundle potential was recorded at the coronary sinus (CS) ostium. Fractionated atrial potentials and an A:V electrogram ratio 1:3 were recorded at the anterior septum of the tricuspid annulus approximately 2 cm from CS ostium. Radiofrequency catheter ablation at the anterior septum of the tricuspid annulus effectively eliminated AVNRT. ©2010, The Authors. Journal compilation ©2010 Wiley Periodicals, Inc.