Table 2.
Intraoperative and postoperative variables
| Severe hyperoxia (SHO) n = 75 | Moderate hyperoxia (MdHO) n = 124 | Mild hyperoxia (MHO) n = 47 | p-value | |
|---|---|---|---|---|
| Intraoperative | ||||
| PaO2, mmHg | 336.18 ± 29.45 | 256.35 ± 27.90 | 164.25 ± 30.15 | <0.001 |
| Haemoglobin, g/l | *99.90 ± 13.97 | 104.49 ± 16.98 | *109.42 ± 13.71 | 0.002 |
| Duration of surgery, minutes | 228.06 ± 64.45 | 210.28 ± 59.65 | 203.61 ± 45.98 | 0.058 |
| CPB time, minutes | 126.25 ± 51.37 | 116.53 ± 44.60 | 107.36 ± 35.71 | 0.084 |
| Aortic clamp time, minutes | 78.92 ± 32.81 | 75.76 ± 28.85 | 66.66 ± 28.56 | 0.249 |
| Minimal nasopharyngeal temperature, °C | 30.83 ± 2.90 | 31.17 ± 3.30 | 31.78 ± 2.77 | 0.233 |
| Lactate, mg/dL | 2.64 ± 2.30 | 2.36 ± 2.13 | 2.29 ± 2.22 | 0.159 |
| Cardioplegia time, minutes | 19.46 ± 8.13 | 23.01 ± 13.23 | 21.58 ± 9.30 | 0.117 |
| Postoperative | ||||
| ICU stay, days | 4.02 ± 5.90 | 2.75 ± 1.66 | 2.57 ± 1.44 | 0.157 |
| CMV duration, hours | *28.24 ± 99.31 | 8.59 ± 10.41 | *6.22 ± 3.87 | <0.001 |
| Reoperation for bleeding, n (%) | 7 (2.8%) | 6 (2.4%) | 1 (0.4%) | 0.211 |
| Perioperative myocardial infarction, n (%) | 39 (16.0%) | 58 (23.8%) | 17 (7.0%) | 0.271 |
| Infectious complications, n (%) | 9 (3.7%) | 4 (1.6%) | 5 (2.0%) | 0.044 |
| Renal failure (creatinine >2.0 mg/dL) | 3 (1.2%) | 8 (3.3%) | 2 (0.8%) | 0.710 |
| Multi-organ failure, n (%) | 1 (0.4%) | 0 | 0 | 0.318 |
| Atrial fibrillation, n (%) | 29 (11.8%) | 44 (17.9%) | 15 (6.1%) | 0.747 |
| Hospital length of stay, days | *16.16 ± 13.77 | 13.02 ± 5.38 | *11.70 ± 3.88 | 0.044 |
| Mortality, n (%) | 1 (0.4%) | 1 (0.4%) | 0 | 0.727 |