2.2 AKI classification
Patients were classified as “no AKI” or “AKI” based on the Kidney Disease Improving Global Outcomes (KDIGO) guidelines, which defines AKI as a ≥ 1.5 times increase in serum creatinine (SCr) versus baseline or as an increase in SCr ≥ 26.5 µmol L-1. Serum creatinine concentrations measured at the post timepoint were compared to those measured at the pre timepoint to classify AKI.