Emergence of atrioventricular nodal reentry tachycardia after surgical or catheter ablation for atrial fibrillation: Are we creating the arrhythmia substrate?

Ablation involving the septum or proximal CS may create a substrate favorable for AVNRT. These findings are consistent with the theory that the posteroseptal left atrium and its connections to the CS are critical for some forms of AVNRT.