DefinitionIntracardiac electrophysiology study (EPS) is an invasive test that allows doctors to determine the details of abnormal heartbeats, or arrhythmias.See also: Cardiac ablation proceduresAlternative NamesElectrophysiology study - intracardiac; EPS - intracardiacHow the test is performedThe study involves placing wire electrodes in the heart to measure electrical activity along the heart's conduction system and in heart muscle cells themselves.The procedure is done in a hospital laboratory by a trained staff that includes cardiologists, technicians, and nurses. The environment is safe and controlled to minimize any danger or risk to the patient.A health care provider will clean your groin area and apply a numbing medication (anesthetic). The cardiologist will then place several IVs i