Fig. 2

Preoperative renal functional reserve in patients with acute kidney injury as compared to patients without acute kidney injury. Median (IQR) renal functional reserve quantified by both creatinine clearance (CrCl) and cystatin C estimated glomerular filtration rate (cysC eGFR) was significantly greater in young adults with congenital heart disease without AKI (CrCl: 35.0 (27.1–43.8) ml/min/1.73m²; cysC eGFR: 11.5 (9.0–14.0) ml/min/1.73m²) as compared to young adults with congenital heart disease with AKI (CrCl: 9.6 (8.0–11.6) ml/min/1.73m²; cysC eGFR: 5.5 (5.0–7.4) ml/min/1.73m²).