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Why doesn’t the body reject a heart valve made from foreign tissue (pig valve)?

In some cases, tissue from a pig is used in replacing the heart's aortic valve. Why doesn't the body reject this foreign tissue? 

submitted by Duane from Pensacola, Florida on 3/23/2013


by Texas Heart Institute cardiovascular surgeon, Denton A. Cooley, MD    

Denton A. Cooley, MDThe porcine (pig) valve is treated with a chemical substance which makes the tissue biocompatible and perform like a synthetic prosthesis.    

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Updated April 2013
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