The Watershed Area in Peripheral Femer Femeral Ecmo

Peripheral phemer pemeral canulation effectively creates two blood streams, grade cardiac output and retrograde ecmo return. The point where the two blood streams meet is called the water shed area which causes a flow related artefect on first past c t a images at c ta. Ecmo perimeter should be returned to pre imaging settings as soon as possible. Risks include clinical instability, oxygen de saturation and throbis formation.