Study of Personalized Allocation of Defibrillators in Non-ischemic Heart Failure (SPANISH-1)

Inclusion Criteria: * Age ≥ 18 years at the time of screening. * Previously established diagnosis of Non-ischemic DCM * Optimised medical treatment at maximum tolerated doses for at least 3 months prior to the screening date. * NYHA functional class II-III. * LVEF ≤ 35% documented by CMR as study procedure. * Life expectancy greater than 12 months. Exclusion Criteria: * History of coronary artery disease justifying the presence of ventricular dysfunction, defined as: history of coronary revascularisation or presence of significant coronary stenosis (≥50% in left main or ≥70% in a major epicardial artery) on invasive or non-invasive coronary angiography (coronary CT) * Left ventricular dysfunction attributed to congenital heart disease, valvular disease, alcohol abuse or chemotherapy. * Hypertrophic or infiltrative cardiomyopathy, active myocarditis or constrictive pericarditis. * History of recovered sudden death or sustained ventricular tachycardia. * NYHA functional class IV. * Waiting list for cardiac transplantation in emergency 0. * Receiver of a solid organ transplant (lung, liver, heart or kidney).