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MODEL RELEASED. Heart bypass surgery. Image 16 of 18. Healthy artery being attached to a diseased coronary artery during coronary artery bypass graft (CABG) surgery. This re-routes the blood flow, bypassing the blocked coronary artery. It is being attached using a magnetic vascular positioner system, which is faster and less invasive than hand-sewing. Blood vessels can become blocked by the build-up of fatty plaques (atherosclerosis). This reduces blood flow to the areas served by the vessel. Inadequate blood flow to the heart can lead to heart pain (angina) or a heart attack (myocardial infarction). For a sequence showing the operation see M560/564- M560/581. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHR 366 ANTONIA REEVE/SCIENCE PHOTO LIBRARY) === ===