The Electrophysiology (EP) Lab at St. Mary-Corwin is used to study the heart's electrical function and to locate sites inside the heart that may be causing abnormal heart rhythms (arrhythmias). The electrophysiologist, a cardiologist who specializes in the electrical system of the heart, works with a highly-skilled team of nurses and technicians to study and treat arrhythmias. The EP lab combines state-of-the-art equipment and cardiac specialists to perform all procedures.