Results of surgery for XXXX .

@entity1 @entity339 @entity943 @entity713 @entity337 @entity1121
Between 1971 and March 1986, 61 @entity1 underwent surgery for @entity1121 . Age at operation varied from 3.5 to 76 years (mean 38). The standard approach was a generous transaortic myectomy. One-quarter of the @entity1 underwent concomitant repair of associated lesions. There was one operative and two late deaths, for an actuarial 5 years survival 93% (+/- 8%). Average follow-up is 3 years per @entity1 . Sixty-four percent of these @entity1 are asymptomatic and another 30% were in New York Heart Association class II. Persistent symptoms were usually related to @entity943 . Early @entity713 did not occur, but two @entity1 were paced for complex @entity943 3 and 4 years after surgery. Hemodynamic studies (n = 22), two-dimensional echocardiographic (n = 47), and Doppler assessments (n = 23) demonstrated a left ventricular outflow tract pressure gradient of 70 and 14 mm Hg before and after surgery, respectively, left ventricular diastolic pressure of 18 and 14 mm Hg, percent of @entity1 with @entity339 of 70% and 30%, percent of @entity1 with systolic anterior motion of 100% and 35%, and percent of @entity1 with @entity337 of 9% and 49%. Eight-six percent of the @entity1 catheterized had no resting obstruction. Subaortic myectomy produces symptomatic improvement by reducing the left ventricular outflow tract pressure gradient, @entity339 , and left ventricular end-diastolic pressure, and probably improves longevity.
