Persistent truncus arteriosus associated with interrupted aortic arch: report of two cases.

Two neonates with a combination of truncus arteriosus and interruption of the aortic arch, so-called type A4 of the Van Praagh classification, are reported. Both presented as tachypnea, poor appetite and increasing cyanosis during the first week of life. The combination of these defects significantly increases the surgical risk. Di-George syndrome was noted in one patient, who presented with hypocalcemia and T cell dysfunction. Autopsy confirmed this diagnosis.