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The cardiologist is a physician who treats and diagnoses disease and injury of the heart and cardiovascular system. The interventional cardiologist is a physician who performs a variety of invasive tests and procedures to assist in diagnoses of and treatment of cardiac disease. A cardiac or cardio-vascular surgeon can be a cardiologist who specializes in surgical interventions of the heart and vascular system.
Cardiologist (Sub-specialty of Internal Medicine) Cardiology is one of many sub-specialties of internal medicine. Cardiologists focus on treatment of the heart and blood vessels of the cardiovascular system. There are many different types of cardiologists, focusing on different aspects of the field. Training to become a cardiologist is fairly extensive, as several years of fellowship are required after completing three years of internal medicine residency.