Abstract
Two patients with tetralogy of Fallot with previous functioning shunt developed obstruction of the right ventricular outflow tract. Preoperative diagnosis and total corrective surgery were successfully carried out. The acquired obstructions were clearly demonstrated by the series of angiocardiograms. Pulmonary atresia may be suspected clinically by disappearance of the systolic murmur. Acquired obstruction of the right ventricular outflow tract appears to be associated with angiocardiographic evidence of increase in the degree of overriding of the aorta. Prompt correction of the defect should be considered after angiocardiographic confirmation of the acquired atresia of the right ventricular outflow tract in such patients.
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