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Supravalvular aortic stenosis. A 20-year clinical perspective and experience with patch aortoplasty.
American Journal of Cardiology 1983 January 16
Supravalvular aortic stenosis has a wide range of clinical and morphologic expression. Since 1961, 25 patients (aged 1 to 49 years) with documented supravalvular aortic stenosis have been evaluated. Seven (28%) had Williams' syndrome, 5 (20%) had a familial form of supravalvular aortic stenosis, and 13 (52%) had a sporadic form. A blood pressure difference of greater than 10 mm Hg between the arms was noted in 65% of the patients. Angiographically, 19 (76%) had segmental supravalvular narrowing; 6 (24%) had diffuse narrowing of the ascending aorta. Sixteen patients underwent patch aortoplasty. At surgery, portions of the aortic valve cusps were frequently attached to supravalvular tissue. This "cusp tuck" resulted in distinctive angiographic features and influenced the results of corrective surgery. Three surgical deaths occurred in the early 1960s-2 with diffuse narrowing of the aorta. Of the remaining 12 patients, followed for 1 to 12 years, 10 are asymptomatic, 1 has angina, and 1 died from cancer. All 8 patients who underwent postoperative catheterization had a thick band between the left and right coronary sinus which represented persistent attachment of portions of the aortic valve cusps to residual supravalvular tissue (cusp tuck). This resulted in aortic valvular gradients (23 to 48 mm Hg) in 4 patients and aortic valvular insufficiency in 2 patients. No significant supravalvular gradient was noted. The 20-year experience with supravalvular aortic stenosis reported herein emphasizes a wide range of clinical and morphologic expression, the benefits and limitations of patch aortoplasty, and the importance of postoperative cardiac catheterization, and furthers the understanding of a complex clinical syndrome.
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