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Circulation, Vol 54, 805-809, Copyright © 1976 by American Heart Association

ARTICLES

Quantitative analysis of pulmonary vascular disease in complete transposition of the great arteries

S Yamaki and F Tezuka

Forty autopsy cases of complete transposition of the great arteries (TGA) and 22 autopsy cases of ventricular septal defect (VSD) were analyzed histologically for evidence of vascular damage due to pulmonary vascular disease (PVD). Positive correlations were generally observed between an index of pulmonary vascular disease (IPVD) and blood pressure of pulmonary circulation. No significant difference in IPVD was found between TGA and VSD in the first five months of life, when cases of each disease were compared at similar blood pressure levels. After that age, however, IPVD was much higher in TGA, and particularly severe PVD in this disease was demonstrated histologically. Morphometrical analysis of the pulmonary artery revealed hypertrophy of the muscular cost in response to elevated blood pressure. However, the progress of medial hypertrophy was retarded in TGA in the first five months, and medial thickness in arteries of cases of TGA older than five months was only 70% of that in VSD at the same blood pressure levels. Suppression of this process of reinforcement of the arterial wall in response to the stress of high pulmonary pressure was regarded as one of the important factors precipitating severe pulmonary vascular disease in transposition of the great arteries.

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