A cardiologist practices in a branch of internal medicine that deals with the diagnosis and treatment of disorders of the heart and circulatory system, including those that stem from birth abnormalities, diseases, or advancing age.
For example, the cardiologist may determine that a child has been born with a hole between the chambers of the heart; the cardiovascular surgeon is the one who will repair this hole through open heartsurgery.
One special diagnostic procedure performed by cardiologists is cardiac catheterization, in which a catheter (a long, thin, flexible tube) is inserted into the heart and adjacent blood vessels, allowing the injection of a special dye that affords a view of those structures.
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