Interest of the Smartphone Application "MonCœur" in the Follow-up of Patients With Heart Failure

Inclusion Criteria: * Patient hospitalized for acute or decompensated heart failure * Patient with a smartphone and able to use a digital application * Beneficiary of a social protection scheme * Patients benefiting from a telemedicine program can be included Exclusion Criteria: * Acute coronary syndrome during ongoing hospitalization. * Acute myocarditis, constrictive pericarditis, acute endocarditis during ongoing hospitalization. * Isolated right heart failure of respiratory origin. * Existence of a cause considered rapidly reversible to acute heart failure: tachyarrhythmia, excessive bradycardia, acute anemia, acute renal failure, malignant hypertension, overdose or cardiotoxic drug intoxication. * Indication of cardiac surgery scheduled within 3 months after hospitalization, patients with Tavi or MItraclip expected within 3 months * Extracardiac disease with short-term prognosis (progressive neoplasia). * Refusal or incapacitation of language or psychic to sign informed consent * Patients participating in an other biomedical research can not participate in this study for the first 6 months, not to interfere with the consultation process of the study. * Pregnant or lactating women can't participate in the study.