| All subjects n = 688 | ED hypoxiaa n = 38 | ED normoxiab n = 350 | ED hyperoxiac n = 300 | P value |
---|---|---|---|---|---|
Emergency department | |||||
 Tidal volume (mL/kg PBW) | 7.5 (6.4–8.6) | 6.6 (6.1–7.7) | 7.5 (6.4–8.6) | 7.6 (6.7–8.7) | 0.001 |
 Respiratory rate | 16 (14–20) | 20 (16–25) | 16 (14–20) | 16 (14–20) | <0.001 |
 FiO2 | 70 (47–100) | 60 (40–80) | 68 (40–100) | 80 (50–100) | 0.004 |
 PEEP | 5 (5–7) | 8 (5–10) | 5 (5–7) | 5 (5–5) | <0.001 |
 pH | 7.29 (7.21–7.38) | 7.26 (7.16–7.33) | 7.29 (7.21–7.38) | 7.29 (7.21–7.39) | 0.354 |
 PaO2 (mm Hg) | 110 (82–179) | 54 (51–55) | 88 (76–101) | 189 (146–249) | <0.001 |
 PaO2/FiO2 | 192 (115–278) | 106 (83–141) | 129 (92–207) | 270 (198–360) | <0.001 |
 Plateau pressure (mmHg) | 20 (17–25) | 24 (20–28) | 20 (17–25) | 20 (17–25) | 0.006 |
 Static compliance (mL/cm H20) | 33 (26–45) | 31 (24–36) | 33 (25–45) | 35 (26–46) | 0.071 |
 Driving pressure (cm H2O) | 14 (11–19) | 15 (12–18) | 14 (11–19) | 14 (11–19) | 0.117 |
Intensive care unit, day 1 | |||||
 Tidal volume (mL/kg PBW) | 8.0 (7.0–8.8) | 7.5 (6.5–8.3) | 8.0 (7.0–9.0) | 7.7 (7.0–8.8) | 0.220 |
 FiO2 | 46 (40–60) | 46 (40–57) | 46 (40–60) | 46 (40–60) | 0.616 |
 PEEP | 5 (5–6) | 6 (5–8) | 5 (5–6) | 5 (5–6) | 0.002 |
 pH | 7.35 (7.29–7.40) | 7.38 (7.30–7.41) | 7.35 (7.29–7.39) | 7.35 (7.29–7.40) | 0.377 |
 PaO2 (mm Hg) | 97 (82–113) | 96 (83–113) | 94 (79–109) | 100 (84–117) | 0.002 |
 PaO2/FiO2 | 207 (163–258) | 206 (169–244) | 200 (156–257) | 210 (170–260) | 0.053 |
 Plateau pressure (mmHg) | 21 (18–25) | 22 (20–25) | 21 (18–25) | 21 (18–25) | 0.266 |
 Static compliance (mL/cm H20) | 35 (27–43) | 33 (27–37) | 34 (27–43) | 35 (28–43) | 0.181 |
 Driving pressure (cm H2O) | 16 (13–19) | 15 (13–18) | 16 (13–19) | 16 (13–19) | 0.342 |