Successful Ablation for Atrial Tachycardia Originated from Sinus Venosa with Tachycardia-Induced Cardiomyopathy

Figure 1

Electrocardiogram revealed atrial tachycardia (AT) with 2 : 1 atrioventricular conduction. P wave (red arrow) morphology was positive in inferior leads (II, III, and aVF), positive in lead V1, and isoelectric in aVL.