premature calcification of a bicuspid aortic valve is the commonest cause of aortic stenosis
it is usually asymptomatic during the first three decades of life during which it may be diagnosed after hearing an aortic ejection sound and a soft ejection murmur
symptoms may begin in fourth decade of life
rarely, the congenital deformity may be a unicuspid valve
senile aortic stenosis:
aortic cusp sclerosis occurs when calcium deposition spreads form the hinge areas of three otherwise normal cusps causing stenosis
patients are usually elderly - in their 70's
rheumatic fusion of the valve commissures and thickening of cusps:
usually accompanied by aortic regurgitation and mitral valve involvement
it accounts for about 10% of acquired aortic stenosis
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