[Supravalvular aortic stenosis. Report of twelve cases (author's transl)].

Twelve patients having supravalvular aortic stenosis were operated. Indication to the surgery was set up with a pressure gradient across the stenosis greater than 50 Hg millimeters and/or in a presence of important symptoms and/or with electrocardiographic signs of left ventricular hypertrophy. The technique and results of operation are described. The indication criteria to surgery on the basis of clinical results are discussed.