Heart valve surgery - series
From DrKoop's partner site on chronic pain, ChronicPainConnection.com
There are four valves in the heart: aortic valve, mitral valve, tricuspid valve, and pulmonary valve. The valves are designed to control the direction of blood flow through the heart. The opening and closing of the heart valves produce the heart-beat sounds. 
Review Date: 08/21/2006  advertisement
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