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Heart bypass surgery. Close-up of a surgeon performing coronary artery bypass graft (CABG) surgery. During CABG, a healthy artery is attached to the diseased coronary artery in order to re-route the blood flow, bypassing the blocked coronary artery. This is usually to treat atherosclerosis, a build-up of fatty deposits that can lead to heart pain (angina) or a heart attack (myocardial infarction). (KEYSTONE/SCIENCE PHOTO LIBRARY/ARNO MASSEE/SCIENCE PHOTO LIBRARY)