What is the structure and function of the heart valve?

Leaflets, flow cont. Heart valves are made of fibrous tissues that are supported in the case of tricuspid and mitral valves with muscles and apparatus that work as a unit. These generally work as check valves, allowing the flow of blood in one direction only and not backwards.

Related Questions

How do heart valve replacements work?

Remove/Replace. The heart is stopped. The patient is placed on bypass which pumps blood and breathes for the patient while the heart and lungs are not being used. The old valve is removed and a new valve is stitched in place. This can be either a "tissue valve" from a pig or cow, or a mechanical valve which is completely artificial.
Valve replacement. The surgery replaces the valve with either a mechanical or animal tissue valve. This is done on a heart lung machine. The valve takes the place of the damaged valve and the patient lives their life with a new disease 'artificial valve' with its own set of problems. The obstruction or valve leak of the diseased valve is corrected by the artificial valve. Sometimes blood thinners are needed.

How is a heart valve surgically repaired?

Depeds which valve. Repair most commonly is done on mitral valve, especially when mitral prolapse is present. The excess, "floppy" tissue causing the valve to prolapse is excised to make leaflets more taught. Sometimes an artificial ring is inserted around the base of the leaflets to cinch the whole apparatus together, if it has become dilated, preventing leaflets from closing up against each other.
Depends which valve. Repair most commonly is done on mitral valve, especially when mitral prolapse is present. The excess, "floppy" tissue causing the valve to prolapse is excised to make leaflets more taught. Sometimes an artificial ring is inserted around the base of the leaflets to cinch the whole apparatus together, if it has become dilated, preventing leaflets from closing up against each other.