The two types of valves that are used are called mechanical and bioprosthetic. Mechanical valves are constructed from strong metals and polymers and are very durable - but, blood thinners need to be taken indefinitely and these medications can harm a fetus in a woman who's pregnant. Bioprosthetic valves are made from pig tissue and do not require blood thinners. However, these valves deteriorate and have a lifespan of only 10-15 years. I hope this information helps, but remember that her cardiologist should be the best resource regarding her individual circumstances.
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