Arrhythmia: Arrhythmias occur when the electrical impulses that inter-relate heart rhythm do not travel normally. It causes the heart beat too fast, too slow, or with an irregular rhythm. Most arrhythmias are harmless, some are serious or even life threatening. When a heartbeat is too fast, too slow or irregular, the heart cannot pump sufficient blood to the body.
Electrophysiology : Electrophysiology is a study of physiology that obtains broadly to the flow of ions in biological tissues and, in particular, to the electrical recording techniques that allow the measurement of this flow. Classical electrophysiology techniques include placing electrodes into various preparations of biological tissue.