Heart failure
Heart failure' is when the heart cannot pump blood well. Heart failure is different from cardiac arrest, because the heart is still working. Someone with heart failure can have shortness of breath, difficulty lying flat, waking up breathless at night, swelling of the legs, and needing to urinate often during the night. There are many reasons why someone can get heart failure, but most often heart attacks, high blood pressure or problems with the heart valves. Some people with heart failure are treated with an artificial pacemaker that makes the heart work better.