Objective To evaluate the outcome of the cardiac catheter angiograplasty for patients after Norwood procedure. Methods 13 patients, who had undergone Norwood procedure (prior to Glenn procedure)received cardiac catheterization and angiography. lnterventional therapy was performed in 12 patients as indicated. Results Angioplasty was carried out for re-coarctation in 6 of the13 patients. 1 patient with left pulmonary artery stenosis received balloon dilation and 3 months later a stent implantation. A stent was implanted to improve the pulmonary blood flow in 2 patients with Sano-Shunt stenosis and 1 patient with BT-Shunt stenosis. Transcatheter coil embolization was performed in 3 of the 4 patients with systemic to pulmonary collateral vessels. The other one was scheduled for Glenn procedure the next day. Conclusion The incidence of hemodynamic restrictions after Norwood procedure is high (12 of 13 patients). Postoperative angiography and hemodynamic assessment for diagnosis and interventional treatment for new pulmonary artery or aortic arch stenosis is necessary after Norwood procedure.