Abstract
We compared semilunar valve relationships of 26 normal hearts with 66 specimens with transposition of the great arteries (TGA). The TGA hearts exhibited a spectrum of dextroposition of the aorta, which brought the point of fibrous continuity between aortic and pulmonary valves 15 to 120° closer to the tricuspid annulus than in the normal specimen. Aortic dextroposition was associated with malalignment of the posterior semilunar (pulmonary) valve in relation to the aortic valve, the tricuspid and mitral valves, and to the membranous ventricular septum.
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