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Valve Replacement
Replacement of the diseased valve is done. This is done biologic tissue valves or mechanical valves. Three types of biologic tissue valves are used.
Autograft :
In this, tissues of the same persons is used to make a valve or a valve itself is used e.g. pulmonary valve of a patient is taken and placed on the diseased aortic valve and the valve structure prepared from the pericardium is placed as pulmonary valve. (Ross procedure)
Allograft :
A valve taken from a dead human after processing is used for replacing the diseased valve of another human being (tissue of one species used for another of the same species).
Xenograft :
Valves taken from pig or pericardial tissue of calves after processing (porcupine and bovine valves).
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