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Figure 1 Surface intracardiac electrograms recorded before (A) and after (B) flecainide infusion, showing the transformation of atrial fibrillation into typical atrial flutter. I, III and V1 = electrocardiographic leads; CS = coronary sinus; HIS = His bundle; -d = distal; -p = proximal; T = tricuspid annulus, with T12 located at the low lateral atrium and T1516 at the high inter-atrial septum.
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