As an electrophysiologist, you are a medical doctor who specializes in the cardiac electrical system. You study how the heart’s electrical system controls blood flow to the rest of the body. Electrophysiologists diagnose and treat patients with heart arrhythmias and cardiac rhythm disorders. The most common issues treated are tachycardia, when the heart beats too quickly, bradycardia, when the heart beats too slowly, and atrial fibrillation (AFib), when the heart contracts irregularly. To pursue a career as an electrophysiologist, you must complete medical school, a residency, and further years of study in the field of electrophysiology. Additional qualifications and skills may be useful when dealing with patients and cardiologists in your department.