Liver resection is an operation to remove the diseased part of the liver. The liver is supplied by two vessels, the hepatic artery and the portal vein supplying 25% and 75% respectively of the total blood flow with 50% oxygen from each vessel. During liver resection it is standard practice to clamp both vessels(Pringle's manoeuvre), so as to avoid bleeding. Clamping both the vessels deprives the unaffected liver from nutrients required for survival. Reinstating the blood supply causes further damage by pouring harmful substances into the liver, which accumulate during the clamping. We hypothesize that not clamping the oxygen rich hepatic artery will cause less damage to the liver.