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An arrhythmia is any deviation from or disturbance of the normal heart rhythm. The basic rhythm of the heart is a tightly regulated phenomenon designed to insure maximal efficiency and optimal performance. It is a dynamic phenomenon that changes according to the metabolic needs of the body. The cardiac rhythm involves several different microscopic and macroscopic structures within the normal heart. Arrhythmias may be benign, symptomatic, life threatening or even fatal. Their consequences depend not only on their manifestation but on the presence of important abnormal structural conditions of the heart.

Electrophysiology Studies
Electrophysiology (EP) is a subspecialty of cardiology which examines the electrical activity of the heart by recording it from within the heart chambers.

To conduct Electrophysiology (EP) studies electrode catheters (long flexible wires) are introduced into the veins and placed under X–ray guidance into the heart. They are used to study abnormal heart rhythms under controlled situations to diagnose specific problems with the heart’s electrical system. The study is a diagnostic test which can be accompanied by the infusion of medications to test what therapies are best and also in conjunction with Radio Frequency Ablation.