BSIP, GONDELON / SCIENCE PHOTO LIBRARY BSIP, GONDELON / SCIENCE PHOTO LIBRARY
Heart bypass grafts. Coloured 3D computed tomography (CT) scan of a heart that has had a blockage of the coronary arteries treated by coronary artery bypass graft (CABG) surgery. The grafts are the blood vessels (cream tubes) running over the outer surface of the heart (red). They supply oxygenated blood to keep the heart muscle pumping, bypassing blockages in the normal coronary arteries (thinner tubes). Blobs seen on the vessels are the sutures used to attach them. The lower apex of the heart is at lower left and the aortic arch is at upper right. CT scanning uses X-ray beams to scan the body. Computers then create 3D images of the area scanned.
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