ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Heart prior to valve replacement surgery. X-ray of the chest of a patient prior to undergoing heart valve replacement surgery. The heart is the white area at bottom centre right. 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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