Abstract
Pericardium and polytetrafluoroethylene are popular patch materials, although they have some deficits in use for thin and small vessels. We present a case of post-Norwood hypoplastic left heart syndrome that required enlargement of the anastomosis between the native ascending aorta and the neoaorta at the time of a bidirectional Glenn procedure. The azygos vein was a useful material for patch augmentation of a hypoplastic ascending aorta.