American Heart Association (AHA) 
The "Heart and Stroke A-Z Guide" provides a broad spectrum of information, including warning signs for heart diesease and stroke, an easy-to-use reference guide, a legislative action package, and family health information.

Congenital Heart Information Network 
This site provides high-quality information for children and adults with congenital heart disease, their families, and health professionals.

Heart Information Network 
This is an educational site that provides a wide range of information and services to heart patients and others interested in learning about lowering risk factors for heart disease.

Mayo Clinic Heart Center 
Experts of the Mayo Clinic offer extensive information on coronary artery disease, preventing heart disease, high blood pressure, circulatory problems and methods of treatment and prevention.

National Heart, Lung and Blood Institute 
This site provides an array of basic and specific heart and vascular disease information, covering topics such as high blood pressure, cholesterol and obesity.

NOAH: New York Online Access to Health 
In addition to basic information, care and treatment, the site includes AHA state chapters, links, support groups, hospital ratings of cardiac units nationwide and capabilities for the blind or visually handicapped to use the site.