This study investigates the mechanism by which kidney dysfunction perpetuates inflammation, immunosuppression, and catabolism (PICS) in chronic critical illness. The investigators will test the hypothesis that persistent kidney dysfunction in sepsis associated by chronic critical illness contributes to decreased survival through the development of PICS. In chronic critical illness, the persistence of the inflammatory state may lead to capillary rarefication in the kidney causing accelerated chronic kidney disease. Progression of chronic kidney disease during chronic critical illness can drive PICS. Indeed, many of the features of chronic critical illness are consistent with the protein-energy malnutrition and muscle wasting associated with chronic kidney disease. Thus, the kidney can play a contributory role in chronic critical illness and PICS.
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Delta Curve Between Calculated GFR and GFR Measured by Iohexol at Baseline
Timeframe: For Arm 1 baseline is measured GFR at 14 days inhospital with sepsis or sepsis diagnosis. For Arm 2 baseline is measured GFR at discharge date prior to day 14 of hospitalizaton with sepsis or sepsis diagnosis.
Delta Curve Between Calculated GFR and GFR Measured by Iohexol at 1 Year Follow-up.
Timeframe: one year follow up for both arms