Acute Heart Failure With Reduced Ejection Fraction - COngestion Discharge Evaluation

This study is evaluating how to best measure fluid buildup (congestion) in patients with heart failure and reduced pumping function, just before hospital discharge. The aim is to ensure patients are truly stable before going home and to reduce the risk of readmission. **You may be eligible if:** - You were hospitalized for acute (sudden-onset) heart failure - Your heart's pumping function (ejection fraction) is below 50% — known as "reduced" ejection fraction - Your doctors think you are ready to be discharged - You are 18 years or older - You are enrolled in a French social security scheme **You may NOT be eligible if:** - You have a serious illness with a life expectancy of 3 months or less - You are on dialysis or have very poor kidney function - You have had lung surgery (removal of part or all of a lung) - You have severe lung conditions that make ultrasound imaging unreliable - You are pregnant, just gave birth, or are breastfeeding - You are under legal guardianship Talk to your doctor to see if this trial is right for you.