Arrhythmia is an irregular heartbeat. It is a condition that occurs with the rhythm or rate of the heartbeat which may be irregular (too slow or too fast). Heart arrhythmias are classified based on heart rate. Some heart arrhythmias diagnosed in the unit of Electrophysiology in Chennai are considered to be harmless whereas others may cause bothersome and at times even life-threatening. A heart-healthy lifestyle may prevent heart damage that can trigger certain heart arrhythmias.