Cardiac catheterization is the procedure of inserting a thin, hollow tube into a blood vessel in the legor, less often the arm, then passing it into or around the heart in order to obtain information about cardiovascular anatomy and function. The procedure is most often performed to evaluate the blood flow in the heart arteries and to identify any significant narrowing or blockages. If a significant blockage is identified, the heart artery may be reopened nonsurgically by an another procedure...