Discrete Subaortic Stenosis

D. T. KELLY, E. WULFSBERC, RICHARD D. ROWE
1972 Circulation  
Twenty-five patients with discrete subaortic stenosis were reviewed. Twenty were operated on for severe obstruction. Review of available data suggests there is a wide spectrum of the disease which may be divided into two main types designated I and II. Type I is a thin discrete membrane immediately under the aortic valve obstructing the outflow but not associated with narrowing of it. Type II is situated about 1 cm below the valve and consists of a fibrous ring, thicker than type I, and
more » ... ed with muscular hypertrophy which narrows the outflow tract, encroaches on the anterior leaflet of the mitral valve, and may extend 1-2 cm downward. Both have a characteristic angiographic appearance. Results of surgery are good for type I but not satisfactory for type II. Aortic incompetence is likely to increase or develop following operation in both types.
doi:10.1161/01.cir.46.2.309 pmid:5065262 fatcat:47gl5cglpfgsjj3346gh66zqzi