Table 2.
Baseline Characteristics
| Electrical Impedance Tomography Cohort | Biomarkers Cohort | |||
|---|---|---|---|---|
| Characteristic | Open-lung Ventilation (n = 28) | Control Ventilation (n = 28) | Open-lung Ventilation (n = 15) | Control Ventilation (n = 15) |
| Age, median (interquartile range), yr | 66 (55–75) | 66 (58–74) | 68 (65–74) | 62 (53–72) |
| Male sex, n (%) | 15 (53.6) | 18 (64.2) | 13 (86.7) | 11 (73.3) |
| Body mass index, mean ± SD, kg/m2 | 25.5 ± 3.7 | 25.5 ± 3.7 | 27.1 ± 3.8 | 25.7 ± 2.8 |
| ASA score, n (%) | ||||
| ≤ 2 | 2 (7.1) | 1 (3.6) | 2 (13.3) | 5 (33.3) |
| 3 | 25 (89.3) | 26 (92.8) | 13 (86.7) | 10 (66.7) |
| 4 | 1 (3.6) | 1 (3.6) | 0 | 0 |
| Smoking status, n (%) | ||||
| Current smoker | 4 (14.3) | 8 (28.6) | 5 (33.3) | 3 (20) |
| Former smoker (weaning less than 6 month) | 2 (7.1) | 2 (7.1) | 1 (6.7) | 0 |
| COPD, n (%)* | 1 (3.6) | 2 (7.1) | 1 (6.7) | 0 |
| Diabetes, n (%) | 2 (7.1) | 5 (17.9) | 5 (33.3) | 3 (20) |
| Hypertension, n (%) | 19 (67.6) | 19 (67.6) | 9 (60) | 4 (26.7) |
| Preoperative left ventricle ejection fraction, mean ± SD, % | 59 ± 8 | 62 ± 8 | 59 ± 8 | 61 ± 9 |
| Type of surgery, n (%) | ||||
| Isolated CABG | 9 (32.1) | 9 (32.1) | 5 (33.3) | 5 (33.3) |
| Isolated valve surgery | 13 (46.4) | 12 (42.9) | 5 (33.3) | 5 (33.3) |
| Other procedures† | 6 (21.4) | 7 (25) | 5 (33.3) | 5 (33.3) |
| Euroscore II, median (interquartile range), % | 1.07 (0.84–1.53) | 1.49 (0.79–2.35) | 2.01 (0.96–2.29) | 0.96 (0.81–1.52) |
ASA, American Society of Anesthesiologists; CABG, coronary artery bypass grafting; COPD, chronic obstructive pulmonary disease.
*
Under chronic inhalation therapy.
†
Thoracic aorta surgeries and combined procedures (valve + CABG, valve + aorta, aorta + CABG).