Heart valve replacement. Chest X-ray (front view), showing an artificial heart valve (round, lower centre) in a patient's heart. The breast bone runs down centre, with the ribs either side. The heart runs from behind the breast bone towards lower right. 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 side X-ray view of this patient, see image M561/076.
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