Etiology, Epidemiology and Prognostics of Acute Kidney Injury (AKI)

1. to investigate the relationship between preexisting malnutrition and adverse outcomes in patients with AKI \- Several nutritional assessment methods such as anthropometric, clinical and biochemical evaluations have been used; however, no single indicator is considered to be a "gold standard." 2. to evaluate the association of serum nutritional variables and prognosis of acute kidney injury 3. Given the different half-lives of serum nutritional markers, we hypothesized that the utility of serum nutritional variables as prognostic predictors may differ in early death (\<7 days) and late death (\>7 days, \<28 days) patients.