Keywords: 3-dimensional electroanatomical mapping system; CRT-D; Cardiac magnetic resonance imaging; LAD; LCx; LMCA; LV; NSVT; RFCA; TCEA; Transcoronary ethanol ablation; VPC; VT; Ventricular tachycardia; cardiac resynchronization therapy-defibrillator; left anterior descending; left circumflex; left main coronary artery; left ventricle; nonsustained ventricular tachycardia; radiofrequency catheter ablation; transcoronary ethanol ablation; ventricular premature contraction; ventricular tachycardia.