Aetiology
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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