ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Heart bypass surgery. Operating theatre and surgical team during a coronary artery bypass operation. Two surgeons are opening the patient's chest (centre), while another is opening a leg (lower right). This operation uses a vein taken from the leg to re-route blood around a blockage in a coronary artery. The coronary arteries supply the heart muscle with blood. Blocked coronary arteries can cause angina pectoris (heart pain) and a heart attack. During the operation the heart is stopped and its function taken over by a heart-lung machine (centre left).
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