Myotonic Dystrophy Initially Presenting as Tachycardiomyopathy Successful Catheter Ablation of Atrial Flutter

Figure 1

The initial ECG (50 mm/s) shows supraventricular tachycardia with 2 : 1 conduction and a resulting heart rate of 160 bpm. Negative deflections of the P-waves in leads II, III, and aVF suggest the presence of counter-clockwise, isthmus-dependent atrial flutter.