What is an electrophysiology study (EP study)?
An electrophysiology study, or EP study, is a type of test in which the heart is paced artificially, and the heart rhythm recorded continuously, in order to evaluate and in many cases treat (see below) a known rhythm disturbance. EP studies are performed in a cardiac catheterization laboratory under very controlled conditions. The EP team, in addition to the electrophysiologist (a cardiologist who subspecializes in the management of rhythm disturbances), consists of nurses and EP lab technologists experienced in taking care of patients with rhythm disorders, as well as an anesthetist or anesthesiologist responsible for keeping the patient comfortable during the test. EP studies are most commonly performed invasively, with catheters that are placed from the vessels of the groin and neck into the heart using X-ray guidance. No incisions (cuts) are made, and no stitches are required. The catheters are then used to pace the heart, and to record the heart’s own intrinsic activity and respon
