BLOCKING IT OUT: APPROACH TO TESTING FOR EXIT BLOCK IN TACHYCARDIA

Complete bi-directional electrical isolation of pulmonary veins (PV) is the cornerstone of catheter ablation (CA) therapy for atrial fibrillation (AF). Bi-directional block is confirmed by left atrial (LA) non-capture during pacing from PV and vice versa, and requires careful assessment of PV to LA