Table 5.

Concordance of AKI designation

Definition ComparisonNo AKI by RIFLE, AKIN, or CKAKI Stage by RIFLE, AKIN, or CK
Risk/Stage 1Injury/Stage 2Failure/Stage 3
KDIGORIFLE
 No AKI21,561 (0.6)0 (N/A)0 (N/A)0 (N/A)
 Stage 1488 (3.9)2573 (5.6)0 (N/A)0 (N/A)
 Stage 21 (0)0 (N/A)722 (13.4)0 (N/A)
 Stage 320 (15.0)19 (42.1)20 (50.0)455 (35.4)
KDIGOAKIN
 No AKI21,561 (0.6)0 (N/A)0 (N/A)0 (N/A)
 Stage 1365 (4.9)2696 (5.4)0 (N/A)0 (N/A)
 Stage 29 (11.1)0 (N/A)714 (13.4)0 (N/A)
 Stage 32 (0)12 (8.3)9 (0)491 (36.9)
KDIGOCK
 No AKI21,561 (0.6)0 (N/A)0 (N/A)0 (N/A)
 Stage 12114 (3.6)721 (8.0)217 (12.0)9 (33.3)
 Stage 2390 (8.0)139 (18.0)147 (21.1)47 (21.3)
 Stage 3126 (6.4)69 (34.8)150 (51.3)169 (43.2)
  • Shown are a cross-tabulation of patients with AKI according to KDIGO, RIFLE, and AKIN. Values in parentheses represent percent in-hospital mortality. KDIGO, Kidney Disease Improving Global Outcomes; AKIN, Acute Kidney Injury Network; CK, creatinine kinetics; RIFLE, Risk Injury Failure Loss ESRD; N/A, not applicable.