Table 2 Main characteristics of patients with hypoxemia classified 24 h after onset of hypoxemia
Characteristics | Group I, n = 296 | Group II, n = 96 | Group III, n = 177 | Group IV, n = 120 | P value |
|---|---|---|---|---|---|
APACHE IV score, median [IQR] | 76 [59–97] | 77 [60–97] | 80 [62–98] | 85.5 [62–111] | 0.06 |
Age, median [IQR] | 62 [49–70] | 62 [50–72] | 64 [54–72] | 62 [53–72] | 0.26 |
Gender, male, n (%) | 183 (62) | 62 (65) | 116 (66) | 80 (67) | 0.74 |
Ventilation parameters, median [IQR] | |||||
Maximum airway pressure, cm H2O | 16 [13–19] | 21 [18–24] | 16 [13–20] | 22 [19–27] | < 0.01 |
PEEP, cm H2O | 5 [5–5] | 8 [6–8] | 5 [5–5] | 8 [7–10] | < 0.01 |
FiO2, % | 40 [35–41] | 40 [40–41] | 40 [40–41] | 41 [40–50] | < 0.01 |
PaO2/FiO2, mmHg | 303 [280–353] | 294 [267–339] | 212 [190–233] | 211 [165–226] | < 0.01 |
Tidal volume, ml/kg PBW | 7.3 [6.4–8.5] | 7.3 [6.3–8.4] | 7.3 [6.4–8.6] | 7.3 [6.5–9] | 0.87 |
Respiratory rate, per minute | 17 [14–22] | 18 [15–21] | 19 [15–23] | 18 [15–24] | 0.15 |
PaO2, mmHg | 120 [105–144] | 126 [111–155] | 90 [78–98] | 94 [82–103] | < 0.01 |
PaCO2, mmHg | 39 [35–44] | 41 [36–45] | 42 [37–48] | 41 [36–48] | 0.01 |