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Among 104 patients with aortic stenosis 15 had subvalvular stenosis. In 4 cases the subvalvular stenosis was caused by fibromuscular constriction of the left-ventricular outlet, in the other cases it was formed by a connective-tissue membrane. A rather frequent combination of the subaortic stenosis with other heart anomalies is pointed out. Two patients died after the operation from progressive cardiac failure.
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