Successful ablation of atrioventricular nodal re-entrant tachycardia in a patient with interruption of inferior vena cava and azygos continuation.

Congenital anomalies of the venous system are a challenge for cardiac catheterization and radiofrequency ablation. This article describes ablation of atrioventricular nodal re-entrant tachycardia performed solely through the azygos continuation in a patient with inferior vena cava interruption.