(NewsNation) — Six in 10 adults will live and die with heart disease by 2050, according to forecasts by the American Heart Association.Cardiovascular disease, which encompasses a range of heart conditions, is already the leading cause of death in the United States.Rheumatic heart disease is one of those conditions.What is rheumatic heart disease?Rheumatic heart disease is a condition in which rheumatic fever has permanently damaged the heart valves, causing symptoms of shortness of breath,