Table 2. Acute Kidney Injury (AKI) Classification per KDIGO Serum Creatinine Criteria After Cardiac Surgery in the Derivation Cohorta,b.
| Kidney injury classification | No. (%) | |
|---|---|---|
| 72 h (n = 58 526) | 14 d (n = 58 526) | |
| Stage 1 (mild): creatinine increase by 1.5-1.9 times baseline within 7 d or increase by ≥0.3 mg/dL within 48 h | 8899 (15) | 11 281 (19) |
| Stage 2 (moderate): creatinine increase by 2-2.9 times baseline | 1450 (2.5) | 1714 (2.9) |
| Stage 3 (severe): creatinine increase by ≥3 times baseline or increase to ≥4 mg/dL or dialysis | 1224 (2.1) | 1442 (2.5) |
a
The study used a modified Kidney Disease: Improving Global Outcomes (KDIGO) definition for AKI diagnosis, by using the most recent preoperative serum creatinine as baseline.
b
Patients who incurred moderate to severe acute kidney injury or started dialysis by the first metabolic blood panel drawn after cardiac surgery were excluded (n = 224).