Pre-existing chronic kidney disease and acute kidney injury among critically ill patients.

Background: The impact of pre-existing chronic kidney disease (CKD) and acute kidney injury (AKI) on health outcomes in critically ill patients is unclear. Yet, CKD complicated by AKI in critically ill patients is common.

Objectives: To compare risk of death within one-month of admission in critically ill patients with and without pre-existing CKD who developed AKI.