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My friend had heart valve replacement few weeks ago. Yesterday he told me what kind of surgery is it. I was surprised. It looks very complicated. I don’t know anything about artificial heart valves. Are they good solution? And are there different types of artificial heart valves? Anybody know? Thanks!

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Artificial heart valves consist of an orifice, through which blood flows, and a mechanism that closes and opens the orifice. There are two main types of artificial heart valves: mechanical and biological. Mechanical are made from synthetic materials. Biological are made from animal or human tissue. The main difference between them is in their durability.
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