Severe Cyanosis Due to Atrial Septal Defect and an Anomalous Inferior Vena Caval Valve

Abstract

Uncomplicated atrial septal defect is often associated with mild arterial de saturation. A case is reported with severe cyanosis and life-threatening hypoxemia due to an atrial septal defect. Cardiac catheterization revealed normal right heart pressures and an atrial septal de fect with shunting of inferior vena caval blood into the left atrium. At surgery an anomalous inferior vena caval valve was found directing inferior vena caval blood into the left atrium. The embryologic basis for this association is discussed. The delayed onset of severe cyanosis may have been contributed to by the tho racic scoliosis.