How does spironolactone treat congestive heart failure?

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As a diuretic, spironolactone helps the kidneys process liquid waste, which then reduces the amount of water your body retains. Congestive heart failure occurs when your heart becomes unable to pump blood efficiently through your body. This can be caused by a number of factors, including high blood pressure, narrowed arteries in the heart (coronary artery disease), obesity, heart attacks, and other damage done to the heart. One of the signs of congestive heart failure is edema, or water retention in the arms, legs, or feet. Spironolactone and other diuretics can treat edema due to congestive heart failure by flushing out excess fluid from the body, which reduces swelling and helps the kidneys function more efficiently.