A case of idiopathic hypertrophic obstructive cardiomyopathy causing severe right ventricular outflow tract obstruction in infancy.

An infant with idiopathic hypertrophic obstructive cardiomyopathy, presenting as severe right ventricular outflow obstruction, is described. The nonspecific clinical features and an unexpected angiocardiographic appearance made determining the correct diagnosis difficult. This infant was mistakenly diagnosed as having severe pulmonary stenosis. Attempted surgical correction was unsuccessful and at necropsy this diagnosis was confirmed. It is suggested that cross-sectional echocardiography may be diagnostic for infants with idiopathic hypertrophic obstructive cardiomyopathy.