WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Heart bypass surgery. Surgeons performing a coronary bypass operation. They are wearing magnifying lenses on their glasses to enhance the view of the procedure. The operation involves grafting blood vessels onto the heart in order to bypass blocked or narrowed coronary arteries. The vessels are usually taken from the patient's leg. Blocked coronary arteries can lead to angina pectoris (chest pain) and heart attack.
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