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Measurement of systemic and pulmonary venous return in the Fontan circuit. In (A), the superior vena cava, or Glenn shunt (orange ring), the inferior vena cava, or Fontan conduit (green ring), right pulmonary artery (red ring), and left pulmonary artery (white ring) indicate the locations of flow volume measurement of passive systemic venous return. In (B), the red rings mark the locations of flow volume measurement of each of the pulmonary veins.
