DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Scar on the chest of a 58 year old man 11 days after coronary artery bypass graft (CABG) surgery. A heart bypass is an operation in which a blood vessel from elsewhere in the patient's body is attached to the heart to divert blood around a blocked or narrowed coronary (heart) artery. Blocked coronary arteries can lead to angina pectoris (severe chest pain) and a heart attack. Blocked or narrowed arteries are usually caused by atherosclerosis, the deposition on a fatty substance on the arteries' inner walls. This is due to a high intake of cholesterol in the diet. Alternatively, an abnormal blood clot (thrombus) may block the artery.
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