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Sinus Node Ablation for Inappropriate Sinus Tachycardia

A 35-year-old woman affected by idiopathic dilated cardiomyopathy, on the waiting list for heart transplantation, underwent transcatheter radiofrequency (RF) ablation for drugresistant inappropriate sinus tachycardia (average daily heart rate of 130 bpm). The first RF energy delivery was performed at the site of the earliest atrial activation, i.e., the upper part of the right atrium (Fig. 1A). During RF energy delivery,