valve, offering desirable haemodynamics. The two leaflets of a bileaflet disc valve open during diastole and close during systole.

Bioprosthetic valves

Bioprosthetic valves are made from animal tissues. Most people with bioprosthetic valves don't need to take anticoagulants long term. However, bioprosthetic valves may only last 10-15 years. They tend to deteriorate more quickly in younger patients. Valve failure prevalence at 10 years is 30%, increasing to 35-65%

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