CHF-COV Reduced (Chronic Heart Failure With Reduced Ejection Fraction - COngestion eValuation)

This study is testing whether lung ultrasound can accurately measure fluid congestion in people with heart failure where the heart muscle pumps weakly (reduced ejection fraction). It compares the ultrasound findings with standard methods to see if this simple bedside tool is reliable. **You may be eligible if...** - You have chronic heart failure with a reduced or mildly reduced pumping function (ejection fraction below 50%) - You are being seen at a scheduled hospital visit or clinic - 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 from another serious illness - You are on dialysis or have severely reduced kidney function - You have had previous lung surgery (removal of a lobe or full lung) - You have severe lung disease that would prevent reliable lung ultrasound (like severe emphysema or pulmonary fibrosis) - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.