Furthermore, the pulmonary artery in unoperated TGA hearts showed a clear trend in loss of actin‐positive smooth muscle cells with age, 34 which may further contribute to NAoR dilatation post‐ASO. 4.3 Effect of a VSD The enlargement of the PV annulus was especially marked when there was a significant VSD from about 30 weeks' gestation.
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Transposition of the great arteries: Fetal pulmonary valve growth and postoperative neo-aortic root dilatation.
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