Inclusion Criteria:  Patients with chronic acute heart failure admitted in hospital for scheduled day hospitalization Age ≥18 years Patients having received complete information regarding the study design and having signed their informed consent form. Patient affiliated to or beneficiary of a social security scheme.  Exclusion Criteria:  Comorbidity for which the life expectancy is ≤ 3 months Dialysis patient (peritoneal dialysis or hemodialysis) or patients with glomerular filtration rate <15 ml/min/m2 at inclusion. History of lobectomy or pneumonectomy lung surgery Severe pulmonary or pleural pathology preventing reliable acquisition of lung ultrasound images: severe emphysema, chronic pleurisy, pulmonary fibrosis, etc. Pregnant woman, parturient or nursing mother Adult person subject to a legal protection measure (guardianship, curatorship, safeguard of justice) Adult person who is unable to give consent Person deprived of liberty by a judicial or administrative decision, Person subject to psychiatric care pursuant to Articles L. 3212-1 and L. 3213-1 of the Public Health Code.