The goal of this observational study is to determine the association of gastrointestinal dysfunction through the Gastrointestinal Dysfunction Scale (GIDS) tool and serum concentrations of citrulline and Intestinal fatty-acid binding protein (I-FABP) with primary \[calories received, protein received, parenteral nutrition requirement and 28-day mortality in the intensive care unit (ICU)\] and secondary (development of pneumonia, surgical and cardiovascular complications in the ICU, length of hospital and ICU stay, duration of mechanical ventilation) clinical outcomes in critically ill patients undergoing aortic surgery.
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Calories delivered daily enterally and/or parenterally
Timeframe: Day 0 to day 7
Protein delivered daily enterally and/or parenterally
Timeframe: Day 0 to day 7