“An arrhythmia is a problem with the rate or rhythm of the heartbeat. During an arrhythmia, the heart can beat too fast, too slowly, or with an irregular rhythm. When a heart beats too fast, the condition is called tachycardia. When a heart beats too slowly, the condition is called bradycardia.  Arrhythmia is caused by changes in heart tissue and activity or in the electrical signals that control your heartbeat.  Often there are no symptoms, but some people feel an irregular heartbeat. The most common test used to diagnose an arrhythmia is an electrocardiogram (EKG).”

National Heart, Lung and Blood Institute