ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Heart bypass surgery. Image 1 of 7. Surgeon removing the mammary artery from a patients chest, for use in a coronary artery bypass graft (CABG). A metal retractor is used to keep the chest open. There are two mammary arteries, which run along the inside of the sternum (breast bone). One of these is being removed so that it can be grafted onto a blocked coronary artery, restoring blood flow to the heart. Coronary arteries can become blocked by a build-up of fatty plaque, leading to loss of blood flow, and consequently lack of oxygen, in an area of the heart. This can cause heart pain (angina) or a myocardial infarction (heart attack). See M560/451 to M560/457.
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