Endogenous Lithium Clearance in Acute Kidney Injury

Critically ill patients are at high risk of developing acute kidney injury (AKI). Lithium is freely filtrated at the glomerulus and almost completely reabsorbed in the proximal tubule, which provides a quantitative estimation of proximal tubule reabsorption. The investigators hypothesized that endogenous lithium reabsorption is impaired in the early stages of critical illness.

Investigators would like to study 10 ICU patients with AKI diagnosed, 10 patients without AKI, and 10 healthy controls.