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pacemaker heart failure ecg defibrillator his bundle pacing left bundle branch block resynchronization marcapasos cardiology icd cardiac resynchronization implantable defibrillator catheter ablation cardiomyopathy atrial fibrillation cardiologia bloqueo de rama izquierda insuficiencia cardiaca heart block his bundle lead extraction pacemaker icd electromagnetic interference icd lead extraction cardiology pacemakers desfibriladores 肠颈谤耻驳铆补 infecciones sincope desfibrilador arrhythmias atrial flutter av block conduction system pacing wpw electrophysiology bundle branch block cardiology ecg physiologic pacing clinical guidelines obesity alcohol anticoagulation venoplasty subclavian vein occlusion his dontdisthehis muerte subita amiodarone desfibrilador implantable taquicardia ventricular infection hypertrophic cardiomyopathy sudden death