Fig. 2From: Pulmonary complications associated with veno-arterial extra-corporeal membrane oxygenation: a comprehensive reviewThe watershed. a Axial. b Sagittal. Contrast in the aorta indicates blood flow from the VA-ECMO arterial cannula, whereas absence of contrast within the ascending aorta indicates blood flow from the native heart. The level of blood mixing in the thoracic aorta represents the VA-ECMO watershed (arrows)Back to article page