define incompetence

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define stenosis

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causes include the following

could be a congenital cause - as in you were anatomically born with it an example would be - bicuspid aortic valve

having a bicuspid valve can mean it may not close properly causing incompetence, and inc turbulance which could then cause calcification which then in turn leads to stenosis occuring

another cause is rheumatic fever, which can deform the valves, endocarditis, MI, Age

Cardiomyopathy (hypertrophic/dialated)

2 extremes