Cardioverter DefIbriIlator PlacEMent for priMary Prevention of Sudden cArdiac Death in Patients Older Than 70 Years

Inclusion Criteria: * ≥70 years old, * Left ventricular ejection fraction ≤ 35%, assessed by echocardiography, single-photon emission computed tomography and radionuclide ventriculography and/or cardiac magnetic resonance (CMR) (assessed at inclusion or within the 6 weeks prior to inclusion). * NYHA class II or III * Heart failure HFOT ≥ 3 months (Possible exceptions : possibility of including patients who do not tolerate the maximum dose or who do not tolerate all four therapeutic classes, as well as the possibility of not waiting for three months when one of the classes is discontinued or when dosage adjustments are made due to poor tolerance ...) * Providing informed consent * Affiliated to a French Health Insurance system. Exclusion Criteria: * Enrolled in or planning to enroll in a conflicting interventional trial (trial evaluating the interest of ICD or modifying HFOT outside the last ESC Guidelines) * Prior unstable sustained ventricular arrhythmia requiring external cardioversion * Myocardial infarction within the 40 days * Coronary artery intervention (catheter or surgical) within 90 days * History of syncope in the previous 6 months * Advanced cerebrovascular disease (cerebrovascular disease with functional repercussions or effect on the patient's autonomy) * Cognitive impairment leading to the incapacity of consent * Any disease other than cardiac disease (e.g. cancer, uremia, liver failure), associated with a likelihood of survival less than 1 year. * Patient under tutorship, curatorship, or legal safeguard * Persons deprived of their liberty by judicial or administrative decision (prisoner)