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Aetiology

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Subvalvular aortic stenosis may be due to:

  • a fibrous or fibromuscular diaphragm immediately below the valve obstructing the flow of blood from the left ventricle to the aorta

  • diffuse narrowing

  • hypertrophic obstructive cardiomyopathy where excessive hypertrophy of the left ventricle and interventricular septum which obstructs the outflow of the left ventricle during systole

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