Identification of Genetic Markers Modulating Rhythmic Risk Among Patients With Severe Cardiomyopathy

Inclusion Criteria: * Patients implanted for primary prevention, an implantable cardioverter defibrillator (ICD) single or double room, for severe cardiomyopathy (EF \<35%) * Patients with ischemic cardiomyopathy or idiopathic dilated cardiomyopathy.- "Appropriate treatment" group: patients who had a rhythmic event (before or after inclusion) appropriately treated either by administering an electric shock or by antiarrhythmic stimulation * Group "no event" patients who have never received treatment or electrical antiarrhythmic stimulation and with a minimum follow-up of three years before inclusion and did not receive proper treatment during the follow up period of the study Exclusion Criteria: * Patients implanted with an ICD for primary prevention in the context of a family hereditary disease (long QT syndrome, Brugada syndrome, hypertrophic cardiomyopathy, ventricular tachycardia catecholergic right ventricular dysplasia ...). * Patients with left ventricular function greater than 35%. * Patients implanted with a defibrillator function resynchronization. * Patients minors, adults under guardianship and protected persons are eligible under this project.