“…Cessation of the arrhythmia by drug therapy [17,19], radiofrequency ablation (RFA) of the tachycardia circuit [4,[12][13][14], or surgical ablation [15] results in the recovery of myocardial function even if the arrhythmia is of long-standing duration. Although SVT-induced DCM is a wellrecognized entity in adults with chronic atrial and ventricular tachycardias [1,5,13,15] as well as in infants [8,9,20], its occurrence in older children and adolescents is rare [4,12,14]. The purpose of this paper is to describe the clinical course of a group of older children and adolescents who presented with DCM secondary to an initially unrecognized non-sinus SVT, reminding the pediatric cardiology community of this reversible cause of DCM.…”