Abstract
A child is described in whom the familial form of idiopathic hypertrophic cardiomyopathy caused isolated and severe obstruction to right ventricular outflow, accompanied by progressive angina pectoris. The obstruction, which resulted from massive hypertrophy of the crista supraventricularis and interventricular septum, was treated by resection and prosthetic enlargement of the right ventricular outflow tract. The results of pre- and postoperative clinical, hemodynamic, and angiographic assessments are summarized.
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