Bicarbonate and Lipocalin in Systemic Inflammatory Response Syndrome (SIRS) Study

The investigators hypothesise: 1. In patients with SIRS and oliguria the early administration of sodium bicarbonate or sodium chloride (control) triggered by an abnormally high NGAL level is feasible. 2. In patients with SIRS and oliguria the early administration of sodium bicarbonate or sodium chloride (control) triggered by an abnormally high NGAL level is safe. 3. In patients with SIRS and oliguria the early administration of sodium bicarbonate or sodium chloride (control) triggered by an abnormally high NGAL level leads to signs or trends of efficacy as measured by serum creatinine derived indices.