The heart has an electrical system that produces tiny electrical impulses, which travel from the upper to the lower chambers of the heart and tell the chambers to contract and pump blood. Sometimes this electrical system may not function properly.
When this happens, it is necessary to study the electrical system with an intracardiac (within the heart) electrophysiologic procedure. In this procedure, one or more catheters (long, thin, flexible tubes) are placed into a blood vessel in the legs, arms or both. The tips of the catheters are strategically placed into the heart where they record the electrical signals. The precision of this procedure far exceeds that of an ordinary electrocardiogram (commonly referred to as an ECG or EKG).