To study if plasma volume expansion is influenced by the rate at which a colloidal solution is administered in patients with a systemic inflammatory response induced by major abdominal surgery. Randomization will be performed postoperatively at the day of surgery with a 1:1 ratio with no stratification and the study drug will be given as a slow (3 hours) or rapid (30 minutes) intravenous infusion.
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Change in plasma volume
Timeframe: From start of infusion until 3 hours after start of infusion