American Heart Association
7272 Greenville Avenue
Dallas, TX 75231
On this site, you will find general information about heart disease, including educational information, news, research, health programs, and dietary information.
Heart Rhythm Society
1325 G Street NW
Washington, DC 20005
The Heart Rhythm Society offers articles on heart rhythm disorders, symptoms and diagnosis, treatments, risk factors, and prevention.
National Heart, Lung, and Blood Institute
NHLBI Health Information Center
PO Box 30105
Bethesda, MD 20824-0105
The NHLBI is a part of the National Institutes of Health. The site provides information about cholesterol, heart disease risk factors, and various heart conditions. The institute conducts and supports research related to the causes, prevention, diagnosis, and treatment of heart, blood vessel, lung, and blood diseases as well as sleep disorders.