Dr. John Kellum has assembled an essential update on the topic of Nephrology as it relates to Critical Care Medicine. Articles include: Diagnostic criteria, Biomarkers for AKI, Sepsis-induced AKI,Drug-induced AKI, Cardio-renal syndrome,Surgery Associated AKI,Contrast-induced AKI, Principles of Fluid Therapy,Fluid composition and clinical effects, Renal replacement therapy, and Understanding acid-base.