American Heart Association
The American Heart Association grew out of a set of smaller precursor groups. The primary precursor was the Association for the Prevention and Relief of Heart Disease, formed in New York City in 1915, to study whether patients with heart disease could safely return to work. Several similar organizations formed or evolved in Boston, Philadelphia, and Chicago in the 1920s. Recognizing the need for a national organization to share research and promote findings, the American Heart Association was formed in 1924 by six cardiologists representing several of these precursor groups.
Heart Rhythm Society
The Heart Rhythm Society is an international non-profit organization that promotes education and advocacy for cardiac arrhythmia professionals and patients. The society was founded in 1979 and counted 5,100 members from over 70 countries as of January 2009. The official journal of the Heart Rhythm Society is Heart"Rhythm", which provides readers scientific developments devoted to arrhythmias, devices, and cardiovascular electrophysiology. The Heart Rhythm Society is headquartered in Washington, DC, USA.