Table 4. Incidence of 30-d postoperative complications by level of renal function

ComplicationLevel of Renal Insufficiency
GFR > 60 (n = 13,292)GFR 30 to 59 (n = 4118)GFR < 30 (n = 424)Dialysis (n = 383)
a GFR, estimated glomerular filtration rate in cc/min per 1.73 m2.
b P < 0.05, c P < 0.001. P values are for χ2 test (patients with a GFR > 60 cc/min per 1.73 m2 used as reference category for each comparison). P ≤ 0.001 for overall χ2 tests across all groups for all variables where pair-wise tests show a statistically significant difference between the reference category and one or more groups.
Death within 30 d290 (2%)175 (4%)c42 (10%)c40 (10%)c
Operative site complications
    superficial wound infection863 (7%)289 (7%)36 (9%)16 (4%)
    deep wound infection404 (3%)119 (3%)13 (3%)18 (5%)
    wound dehiscence227 (2%)79 (2%)8 (2%)6 (2%)
    graft failure requiring return to the operating room541 (4%)169 (4%)15 (4%)18 (5%)
Cardiopulmonary complications
    cardiac arrest162 (1%)92 (2%)c21 (5%)c18 (5%)c
    myocardial infarction167 (1%)116 (3%)c15 (4%)c8 (2%)
    unplanned intubation309 (2%)187 (5%)c27 (6%)c15 (4%)b
    intubated > 48 h326 (3%)165 (4%)c32 (8%)c13 (3%)
Infectious complications
    systemic sepsis163 (1%)68 (2%)b14 (3%)c14 (4%)c
    pneumonia446 (3%)170 (4%)b32 (8%)c16 (4%)
Other complications
    stroke69 (<1%)25 (<1%)5 (1%)2 (<1%)
    coma > 24 h15 (0.11%)11 (0.27%)b2 (0.47%)b4 (1.04%)c
    bleeding189 (1%)94 (2%)c13 (3%)c11 (3%)b
    acute renal failure71 (<1%)60 (2%)c24 (6%)cNot included