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A cardiologist is a medical doctor who specializes in diagnosing and treating conditions and diseases of the heart and blood vessels. This includes diseases such as coronary artery disease, heart attack, high blood pressure, heart failure, arrhythmias (irregular heartbeats), and other conditions affecting the heart and circulatory system. Cardiologists may work in a hospital setting or in private practice, and may perform a variety of procedures and tests such as echocardiography, stress tests, and angiograms to help diagnose and treat heart conditions. They may also prescribe medications and provide lifestyle advice to help manage and prevent heart disease.