Catheter ablation of atrial tachycardia originated from the ostium of anomalous drainage between left interior pulmonary vein and left atrial appendage

Atrial tachycardia from the left atrium is well recognized, the common origin was identified at mitral annulus, left atrial appendage (LAA) and pulmonary vein (PV). However, there is no report about AT in patient with anomalous pulmonary venous drainage. We report one case with focal AT originating from the ostium of anomalous drainage between left interior PV and LAA.