Abnormal Heart Rhythms

Abnormal heart rhythms, or arrhythmias, occur when the heart beats irregularly. When the heart beats too quickly, it is called tachycardia, and may be caused by an underlying cardiovascular problem or an abnormality in the heart's electrical system. Slower heartbeats, called bradycardia, often a normal finding in athletes, can also be caused by medications or an electrical heart block, a more serious condition. Click on a program below to learn more about abnormal heart rhythms.