It was found that in isolated infundibular stenosis of the pulmonary artery a mass of muscle-fibrous tissue creates an obstacle to blood flow in the right ventricle. Morphogenetic regularities of compensatory and adaptive reactions in isolated infundibular stenosis are similar to those observed in hypertrophic cardiomyopathy. It may be suggested that abnormalities in the structure of the hypertrophied myocardium in isolated stenosis of the right ventricle infundibulum is a result of a fundamental error in the cardiac morphogenesis and not a reflection of increase of the degree of cardiac hypertrophy.
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