Table 3. Incidence of CRS type 1 according to the RIFLE, AKIN, KDIGO and K(+)R(−)+K(+)A(−) definitions.

Classification	Incidence of AKI by all stages	Stage	Incidence of AKI by each stage
RIFLE	323(32.1%)	Risk	141(14.0%)
		Injury	116(11.5%)
		Failure	66(6.6%)
AKIN	349(34.7%)	1	157(15.6%)
		2	101(10.0%)
		3	91(9.1%)
KDIGO	391(38.9%)	1	194(19.3%)
		2	104(10.3%)
		3	93(9.3%)
K(+)R(−) + K(+)A(−)a	110(10.9%)	1	98(9.8%)
		2	3(0.3%)
		3	9(0.9%)

CRS: cardiorenal syndrome;

^a: AKI diagnosed by KDIGO criteria but missed by RIFLE or AKIN criteria. AKI: Acute Kidney Injury.