CHASSENET / SCIENCE PHOTO LIBRARY CHASSENET / SCIENCE PHOTO LIBRARY
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Heart valve surgery. Surgeons performing percutaneous aortic valve replacement surgery to fit an artificial (prosthetic) heart valve. This is a minimally invasive procedure, where the prosthesis is delivered via a catheter rather than through an incision in the chest. There are four valves in the human heart, all of which prevent the backflow of blood. Damage to the valves can lead to malfunctioning of the heart and death. If a valve cannot be repaired it must be replaced.
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