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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.
Interventional cardiology deals specifically with the catheter-based treatment of heart diseases. Interventional cardiologists are board-certified cardiologists who perform interventional cardiology procedures, most often in a cardiac catheterization lab at a hospital. The majority of interventional cardiology procedures are performed in the cardiovascular (heart, veins and arteries) system. Most interventional cardiology procedures are considered to be minimally invasive because they do not require an instrument to enter the body or large incisions -- most incisions are approximately 1 inch.