From: Airway driving pressure and lung stress in ARDS patients
Variable | Overall population (N = 150) | Lower airway driving pressure (<15 cmH2O) (N = 108) | Higher airway driving pressure (≥15 cmH2O) (N = 42) | p value |
---|---|---|---|---|
Airway driving pressure (cmH2O) | 12.6 [10.3–15.2] | 11.6 [10.0–13.1] | 16.9 [15.7–18.9] | <0.001 |
Transpulmonary driving pressure (cmH2O) | 9.0 [7.3–11.7] | 8.1 [6.5–9.8] | 13.6 [11.7–15.1] | <0.001a |
End-inspiratory airway plateau pressure (cmH2O) | 18.2 [16.2–20.9] | 17.2 [15.6–18.7] | 22.5 [20.9–24.0] | <0.001 |
Lung stress (cmH2O) | 13.5 [10.7–16.0] | 11.8 [10.0–14.0] | 17.5 [15.4–18.9] | <0.001a |
Respiratory system elastance (cmH2O/L) | 25.2 [19.8–30.5] | 22.1 [18.7–26.7] | 33.6 [29.6–40.4] | <0.001 |
Lung elastance (cmH2O/L) | 17.5 [13.9–23.2] | 15.4 [12.7–19.9] | 27.4 [21.9–31.6] | <0.001 |
Chest wall elastance (cmH2O/L) | 6.3 [4.3–9.0] | 5.9 [4.3–8.7] | 7.8 [4.6–10.4] | 0.054 |
PaCO2 (mmHg)b | 44.2 [39.9–50.5] | 43.9 [39.2–50.5] | 47.6 [41.3–50.7] | 0.117a |
PaO2/FiO2 ratiob | 143 [98–177] | 145 [104–178] | 132 [81–176] | 0.404 |
Lung total gas (mL)c | 1058 [721–1662] | 1234 [879–1827] | 694 [562–903] | <0.001 |
Total lung tissue weight (g)b | 1394 [1145–1684] | 1369 [1173–1742] | 1457 [1050–1682] | 0.787 |
• Non-aerated lung tissue (%)b | 45.2 [34.0–56.9] | 44.9 [36.6–53.6] | 50.4 [30.7–61.1] | 0.419a |
• Poorly aerated lung tissue (%)b | 28.1 [20.2–39.2] | 27.1 [20.1–36.1] | 34.1 [20.3–43.0] | 0.067 |
• Well-aerated lung tissue (%)b | 23.9 [14.2–33.9] | 28.2 [17.2–34.6] | 16.5 [8.2–26.7] | 0.006 |
• Over-aerated lung tissue (%)b | 0.01 [0.00–0.17] | 0.03 [0.00–0.29] | 0.00 [0.00–0.02] | 0.002 |
Lung recruitability (%)b | 15.6 [7.9–23.7] | 12.5 [7.5–22.1] | 18.5 [9.7–26.4] | 0.110 |
ICU mortality N (%) | 48 (32.0) | 29 (26.9) | 19 (45.2) | 0.049 |