Heart failure is a condition in which the heart does not pump blood as well as it should, leading to fluid building up in the lungs. Old age, high blood pressure, and coronary artery disease are risk factors for heart failure. Drugs called tumor necrosis factor (TNF) antagonists were once thought to offer hope as a treatment for heart failure, but recent studies showed no benefit and one study actually showed that they could worsen heart failure. These drugs have been approved by the U.S. Food and Drug Administration (FDA) for the treatment of two other conditions, inflammatory bowel disease and rheumatoid arthritis.