Abnormal heart rhythms (arrhythmias) are sequences of heartbeats that are irregular. They are too fast, too slow, or conducted via an abnormal electrical pathway through the heart. Heart rhythms differ from one person to the other. Health, age and fitness are often key factors.
The heart is a muscular organ with four chambers, designed to work efficiently, reliably, and continuously over a lifetime. The muscular walls of each chamber contract in a regulated sequence, pumping blood as required by the body while expending as little energy as possible during each heartbeat.