Banding of the pulmonary artery has been shown to be a useful procedure in infants with a large ventricular septa1 defect, enabling them to survive until a suitable age for repair of the defect.According to the classification used, a type I1 VSD has a large left to right shunt with a loud, low-pitched systolic murmur, associated with pulmonary hypertension and left ventricular hypertrophy; in type I1 (a) the pressure in the pulmonary artery does not exceed 70% of the systemic pressure and pulmonary resistance is normal; in type I1 (b) the pressure in the pulmonary artery is more than 70% of the systemic pressure, and there is moderate increase in pulmonary resistance.Catheterization, including angiocardiography, has been performed in 27 infants aged from 32 months to 8 years, who had previously undergone banding of the pulmonary artery.