Arrhythmia

Also known as: Cardiac rhythm disturbances, Heart rhythm disorders, Abnormal heartbeat, Change in heartbeat, Bradycardia, Tachycardia, Atrial flutter, Accelerated idioventricular rhythm, Lown-Ganong-Levine syndrome
An abnormal heartbeat (arrhythmia) is any variation in the normal heartbeat. Abnormal heartbeats occur when the heart has an irregular heart rhythm, beats too fast (tachycardia), or beats too slowly (bradycardia).