Fig. 1

a Twelve-lead electrocardiogram showing the wide native QRS complex (145 ms) with first-degree atrioventricular block (PR 280 ms). b Two-dimensional color transthoracic echocardiogram apical four-chamber view. AV atrioventricular, CRT cardiac resynchronization therapy, ECG electrocardiogram, ICD implantable cardioverter defibrillator, LBBB left bundle branch block, M male, NO ISCH. DCM non-ischemic dilated cardiomyopathy, NYHA New York Heart Association, TTE transthoracic echocardiogram