ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
Heart valve replacement. Chest X-ray (side view), showing an artificial heart valve (round, lower right) in a patient's heart. The spine is at left and the heart (white) takes up most of the lower right area. Heart valves control blood flow into and out of the heart, as well as between its chambers. Valve failure can lead to malfunctioning of the heart and death. For a frontal X-ray view of this patient, see image M561/077.
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