Muscular Subaortic Stenosis

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Abstract
ACCURATE diagnosis of obstruction to the outflow tract from the left ventricle was not considered necessary until the development of extracorporeal circulation and open-heart surgery. The diagnosis of stenosis of the aortic valve was usually considered adequate. Although supravalvular and subvalvular stenosis were known these diagnoses were of academic interest, usually made in retrospect.Today, the precise cause for left-ventricle outflow obstruction must be known before the appropriate surgical procedure can be determined. Open-heart surgery revealed still another obstructive lesion of the outflow tract that may simulate aortic stenosis, mitral insufficiency or ventricular septal defect. Brock1 was the first to . . .