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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.
There are several types of cardiologists, each specializing in a different area of heart treatment (note that some cardiologists may do a combination of things listed below): Non-invasive Cardiologists - will examine patients, do cardiology consultations, order and interpret tests (stress tests or electrocardiograms).