Table 1 Baseline characteristics of the study population overall and according to the presence or absence of AKI
From: Early serum creatinine accurately predicts acute kidney injury post cardiac surgery
Total | No AKI | AKI | p-value | |
|---|---|---|---|---|
N = 196 | N = 156 | N = 40 | ||
Age, median (IQR) | 70.8 (63.0, 81.2) | 69.7 (61.2, 80.5) | 75.2 (66.9, 82.2) | 0.035 |
Male | 144 | 111 (71.2%) | 33 (82.5%) | 0.15 |
Operation type | 0.59 | |||
CABG Only | 72 | 59 (37.8%) | 13 (32.5%) | |
Valve Only | 61 | 48 (30.8%) | 13 (32.5%) | |
CABG & Valve | 56 | 42 (26.9%) | 14 (35.0%) | |
Other | 7 | 7 (4.5%) | 0 (0.0%) | |
Diabetes mellitus | 37 | 25 (16.0%) | 12 (30.0%) | 0.044 |
Ischaemic heart disease | 92 | 70 (44.9%) | 22 (55.0%) | 0.25 |
Hypertension | 133 | 100 (64.1%) | 33 (82.5%) | 0.026 |
COAD | 10 | 7 (70%) | 3 (30%) | 0.440 |
ACEI/ARB use | 116 | 88 (56.4%) | 28 (70.0%) | 0.12 |
Pre Op Creatinine (umol/L), median (IQR) | 82.0 (71.0,96.0) | 80.0 (69.5, 93.0) | 90.0 (77.5, 119.5) | 0.003 |
Pre Op eGFR (ml/min/1.73 m2), median (IQR) | 80.1 (64.3, 88.9) | 82.0 (66.5, 89.6) | 69.4 (49.2, 81.5) | 0.002 |
Pre Op proteinuria | 35 | 23 (14.7%) | 12 (30%) | 0.025 |
Pre Op CKD stagea | 0.013 | |||
Stage 1 | 41 (21%) | 37 (23%) | 4 (10%) | |
Stage 2 | 117 (60%) | 96 (62%) | 21 (53%) | |
Stage 3a | 23 (12%) | 15 (10%) | 8 (20%) | |
Stage 3b | 13 (7%) | 7 (4%) | 6 (15%) | |
Stage 4 | 2 (1%) | 1 (1%) | 1 (3%) | |
Cardiopulmonary bypass time (mins), median (IQR) | 96.1 (77.1, 129.9) | 96.7 (77.1, 129.9) | 90.7 (76.6, 131.5) | 0.94 |
Cross clamp time (mins), median (IQR) | 77 (60–109) | 79.3 (61,107) | 75.63 (60,113) | 0.94 |
Inotrope use | 112 | 83 (53.2%) | 29 (72.5%) | 0.028 |
Total length of stay (days), median (IQR) | 10.0 (8.0,13.0) | 9.0 (8.0, 12.0) | 11.5 (9.0, 16.5) | 0.002 |
ICU length of stay (days), median (IQR) | 1.0 (1.0,2.0) | 1.0 (1.0, 2.0) | 2.0 (2.0, 3.5) | <0.001 |