Development of subneopulmonary obstruction early after arterial switch operation in an adult

In a 19-year-old woman who had previously undergone pulmonary artery banding at the age of 1.5 years, a muscular right ventricular outflow tract obstruction developed 3 days after an arterial switch operation. Although conservative therapy proved successful, prophylactic surgical intervention on the conal septum may be beneficial in preventing the postoperative development of right ventricular outflow tract obstruction.