Check position of the IVC cannula, and consider revising - tip of cannula should be adjacent to the hepatic veins
Confirm that all 6 (six) white Roberts clamps are fully open. Confirm that the metra is in "liver on-board" mode by checking the lower right of the GUI screen
Check the portal vein for twists, and consider revising if necessary
Confirm that the pump speed is greater than 750RPM
Confirm that there are no kinks in any of the tubing
Confirm PVHa is not at 100% occluded by checking top left of GUI screen - stop perfusion (for four seconds) and restart to reset PVHa