A cardiologist is a medical professional that studies and treats the heart. Within the cardiology profession, different heart doctors practice subspecialties of cardiology. For example, some cardiac subspecialists solely perform surgical procedures on the heart. Others specialize in diagnosing various heart conditions, such as coronary artery disease or heart murmurs. Still some cardiologists specialize in doing research about the heart. When people experience heart rhythm problems, it calls for a specialist who can perform certain treatments to restore the heart’s natural rhythm. An electrophysiologist, sometimes referred to as an “EP”, performs these procedures that help manage or correct irregular heart rhythms.