Figure 1.

Here are three possible cannula arrangements for VV ECMO. In example A, deoxygenated blood is drained from the patient from a multi-hole cannula positioned in the inferior vena cava (inserted in a femoral vein) and oxygenated blood returns to the patient via a cannula positioned in the right atrium (inserted in the right internal jugular vein). In example B, blood is drained from the patient via a cannula positioned in the distal inferior vena cava or iliac vein (inserted in a femoral vein) and blood returns to the patient via a cannula positioned in the right atrium (inserted into the femoral vein). In example C, a double lumen cannula is inserted into the right internal jugular vein. The return port is positioned in the right atrium and the multi-holed drainage port is positioned in the inferior vena cava. In each configuration, the goal is to return oxygenated blood to the right atrium with the goal of the majority of the return blood passing through the tricuspid valve and through the pulmonary circulation. By having oxygenated return blood pass through the tricuspid valve recirculation (in which oxygenated return blood passes directly to the drainage cannula) is minimized.