Table 3.

Incidence of contrast-induced acute kidney injury

CIAKI definitionOverall (n = 367)Inpatient (n = 119)Outpatient (n = 248)Pb
All patients
    ≥ 25%24 (6.5)15 (12.6)9 (3.6)0.001
    ≥ 50%a2 (0.5)1 (0.8)1 (0.4)0.6
    ≥ 100%(0) 00 (0)0 (0)
    ≥ 0.25 mg/dl40 (10.9)21 (17.6)19 (7.7)0.004
    ≥ 0.5 mg/dl13 (3.5)8 (6.7)5 (2.0)0.2
    ≥ 1.0 mg/dl1 (0.3)0 (0)1 (0.4)0.5
eGFR ≤ 45 ml/min per 1.73 m2n = 51n = 15n = 36
    ≥ 25%6 (11.8)2 (13.3)4 (11.1)0.8
    ≥ 50%a1 (2.0)0 (0)1 (2.8)0.5
    ≥ 100%0 (0)0 (0)0 (0)
    ≥ 0.25 mg/dl7 (13.7)2 (13.3)5 (13.9)0.9
    ≥ 0.5 mg/dl5 (9.8)2 (13.3)3 (8.3)0.6
    ≥ 1.0 mg/dl1 (2.0)0 (0)1 (2.8)0.5
eGFR > 45 ml/min per 1.73 m2n = 316n = 104n = 212
    ≥ 25%18 (5.7)13 (12.5)5 (2.4)<0.001
    ≥ 50%a1 (0.3)1 (1)0 (0)0.2
    ≥ 100%0 (0)0 (0)0 (0)
    ≥ 0.25 mg/dl33 (10.4)19 (18.3)14 (6.6)0.001
    ≥ 0.5 mg/dl8 (2.5)6 (5.7)2 (0.9)0.01
    ≥ 1.0 mg/dl0 (0)0 (0)0 (0)
  • eGFR, estimated glomerular filtration rate; —, not applicable. Data are n (%).

  • a The 2 patients meeting this definition of CIAKI also met criteria for RISK category of acute kidney injury as defined by RIFLE criteria.

  • b Comparison of CIAKI between inpatients and outpatients.