SN instructed patient about the heart is a muscle that pumps oxygen-rich blood to all parts of the body. When you have heart failure, the heart is not able to pump as well as it should. Blood and fluid may back up into the lungs (congestive heart failure), and some parts of the body don’t get enough oxygen-rich blood to work normally. These problems lead to the symptoms of heart failure. Follow a heart healthy diet. And make sure to limit the salt (sodium) in your diet. Salt causes your body to hold water. This makes your heart work harder as there is more fluid for the heart to pump.