Chronic Heart Failure With Preserved Ejection Fraction - COngestion eValuation

This study is testing whether lung ultrasound can accurately measure fluid buildup (congestion) in people with heart failure where the heart muscle pumps with preserved strength (preserved ejection fraction, or HFpEF). This simple bedside imaging tool may help doctors better gauge how much fluid is in the lungs. **You may be eligible if...** - You have been diagnosed with chronic heart failure with preserved ejection fraction (pumping function ≥ 50%) - You are being seen at a scheduled hospital visit or clinic appointment - You are 18 or older and have signed the informed consent form **You may NOT be eligible if...** - You have a life expectancy of 3 months or less due to another illness - You are on dialysis or have severely reduced kidney function - You have had previous lung surgery (removal of a lobe or entire lung) - You have severe lung disease that would make lung ultrasound images unreliable (e.g., severe emphysema, pulmonary fibrosis) - You are pregnant or breastfeeding - You are under a legal protection measure or unable to give consent Talk to your doctor to see if this trial is right for you.