ARNO MASSEE / SCIENCE PHOTO LIBRARY ARNO MASSEE / SCIENCE PHOTO LIBRARY
Cardiac catheterization. Close-up of a surgeon inserting a catheter into a patient's blood vessels to reach the heart, a process known as cardiac catheterization. This can be done for diagnostic purposes or to treat a known condition. It is typically carried out to treat coronary artery disease by reducing blockages in the arteries of the heart.
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