Table 2.
Baseline characteristics of the ATAAD patients in the 2 groups.
| Hypoxemia（n = 142） | Non-hypoxemia（n = 68） | P value | |
|---|---|---|---|
| Pre-operation characteristics | |||
| Male, n (%) | 110 (77.5) | 54 (79.4) | .750 |
| Age, yrs | 53.8 ± 11.1 | 51.7 ± 11.7 | .213 |
| Hypertension, n (%) | 123 (86.6) | 57 (83.8) | .588 |
| BMI, kg/m2 | 26.4 ± 3.8 | 24.4 ± 3.3 | <.001 |
| Pre-op PaO2/FiO2, mm Hg | 229.7 ± 91.4 | 299.7 ± 101.2 | <.001 |
| In-operation characteristics | |||
| Operation time, h | 8.2 ± 1.7 | 7.9 ± 1.4 | .217 |
| CPB time, min | 196.3 ± 41.0 | 181.0 ± 37.3 | .010 |
| Aortic cross-clamping time, min | 112.6 ± 28.4 | 107.1 ± 21.3 | .162 |
| DHCA time, min | 23.7 ± 4.4 | 23.2 ± 4.5 | .427 |
| Post-operation characteristics | |||
| Post-op PaO2/FiO2, mm Hg | 131.0 ± 40.3 | 265.6 ± 54.6 | <.001 |
| PaO2/FiO2 before extubating, mm Hg | 237.9 ± 63.4* | 270.2 ± 59.3 | .001 |
| MV time, h | 75.1 ± 50.8 | 43.0 ± 33.4 | <.001 |
| Neurological dysfunctions, n (%) | 42 (29.6) | 17 (25.0) | .490 |
| Delirium | 34 (23.9) | 12 (17.6) | .302 |
| Stroke | 9 (6.3) | 3 (4.4) | .574 |
| Paraplegia | 6 (4.2) | 3 (4.4) | .950 |
| Acute renal failure, n (%) | 31 (21.8) | 6 (8.8) | .021 |
| Re-operation, n (%) | 11 (7.7) | 12 (17.6) | .032 |
| Re-admission to ICU, n (%) | 8 (5.6) | 4 (5.9) | .942 |
| Length of ICU stay, d | 7.6 ± 7.0 | 6.4 ± 8.7 | .267 |
| Length of hospital stay, d | 22.3 ± 10.6 | 21.8 ± 10.4 | .730 |
| Hospital mortality, n (%) | 18 (12.7) | 4 (5.9) | .133 |
| Long-term mortality, n (%) | 32 (22.5) | 13 (19.1) | .572 |
ATAAD = acute type A aortic dissection, BMI = body mass index, CPB = cardiopulmonary bypass, DHCA = deep hypothermic circulatory arrest, ICU = intensive care unit, MV = mechanical ventilation, Pre-op = pre operation.
*
P < .001 versus post-op PaO2/FiO2.