1. The superior vena cava is connected to the right pulmonary artery (right-sided cavopulmonary anastomosis).
2. The right-sided cavopulmonary anastomosis (SVC to RPA) allows a passive venous return to the pulmonary arteries. There is a preferential venous return to the right pulmonary artery (red arrow) due to venous admixture from the extraatrial conduit (blue arrows).
3. The extraatrial conduit connects the IVC to both the right and left pulmonary arteries.
4. The extraatrial conduit allows flow from the IVC to both pulmonary arteries without the mechanical help of the right ventricle (bypassing the right ventricle). There is venous admixture to both the RPA and LPA (blue arrows).
5. Left pulmonary artery stent.
- IVC conduit: Inferior vena cava conduit (synonyms include external cardiac conduit or extraatrial conduit1)
- SVC: superior vena cava
- LPA: left pulmonary artery
- RPA: right pulmonary artery