[TM and bidimensional echocardiography of subvalvular aortic stenoses]

28 children (age: 7.5 +/- 4.6 years) and five adults with a subvalvular aortic stenosis were evaluated by TM and bidimensional echography. Long axis parasternal and apical two cavities-aorta views seem the most reliable to determine the anatomical varieties (type I in diaphragm: 25 cases; type II fibromuscular: 5 cases; tunnel: 1 case; isolated mitral abnormalities: 2 cases). 24 patients were catheterized. Among the various echocardiographic parameters that were measured, the ratio parietal thickness/left ventricular diameter in telesystole appears best correlated to the hemodynamic gradient (r = 0.65).