Residual renal impairment at discharge occurred in 9 % of our population, which was influenced by the following predictive factors: presence of comorbidities (p = 0.023), hypotension (p < 0.001), hypoxia (p = 0.02), heart failure (p = 0.001), adult respiratory distress syndrome (ARDS) (p = 0.005), hypernatremia (p = 0.011), abnormal liver profile (p = 0.046), high C-reactive protein (p = 0.033), and positive blood culture (p = 0.002) (Table 3). This evidence concerns the gene CRP and acute respiratory distress syndrome.