Variables | Overall (n = 78) | O2-non-responders (n = 17, 22%) | O2-responders (n = 61, 78%) | p value |
---|---|---|---|---|
Males, no. (%) | 61 (78) | 13 (77) | 48 (79) | 0.845 |
Age (years) | 62 (51–68) | 56 (51–66) | 62 (52–68) | 0.389 |
BMI (kg/m2) | 27 (25–31) | 26 (24–31) | 27 (26–31) | 0.670 |
SOFA score | 4 (3–5) | 4 (3–5) | 4 (4, 5) | 0.294 |
APACHE II score | 10 (8–12) | 11 (8–14) | 10 (8–12) | 0.620 |
Intubated, no. (%)a | 75 (96) | 16 (94) | 59 (97) | 0.622 |
Respiratory rate (breaths/min)b | 20 (18–22) | 19 (18–22) | 20 (17–22) | 0.813 |
FiO2 (%)b | 75 (60–90) | 80 (60–88) | 70 (60–90) | 0.839 |
PEEP (cmH2O)b | 14 (12–15) | 14 (11–14) | 14 (12–15) | 0.662 |
PaO2/FIO2 ratiob | 111 (83–164) | 99 (72–150) | 114 (85–168) | 0.419 |
ARDS severity, no. (%)b | ||||
 Mild | 10 (13) | 2 (13) | 8 (14) | 0.721 |
 Moderate | 34 (45) | 6 (38) | 28 (48) |  |
 Severe | 31 (41) | 8 (50) | 23 (39) |  |
Tidal volume/PBW (mL/kg)b | 7.0 (6.4–7.8) | 7.2 (6.2–7.9) | 7.0 (6.4–7.8) | 0.707 |
Plateau pressure (cmH2O)b | 25 (22–27) | 27 (24–28) | 24 (22–27) | 0.043 |
Driving pressure (cmH2O)b | 12 (9–14) | 14 (12–15) | 12 (8–13) | 0.022 |
Respiratory system compliance (mL/cmH2O)b | 42 (32–53) | 34 (30–45) | 45 (34–56) | 0.018 |
pH | 7.36 (7.31–7.41) | 7.33 (7.29–7.42) | 7.37 (7.32–7.41) | 0.244 |
PaO2 (mmHg) | 78 (70–95) | 76 (68–90) | 80 (70–99) | 0.443 |
PaCO2 (mmHg) | 47 (40–56) | 50 (39–58) | 47 (41–55) | 0.417 |
Ventilatory ratio | 1.8 (1.4–2.0) | 1.8 (1.4–2.5) | 1.8 (1.4–2.0) | 0.345 |
LDH (units/L) | 414 (307–490) | 418 (329–485) | 400 (301–490) | 0.620 |
ICU mortality, no. (%) | 34 (44) | 11 (65) | 23 (38) | 0.047 |
Hospital mortality, no. (%) | 34 (44) | 11 (65) | 23 (38) | 0.047 |
ICU LOS (days) | 18 (11–34) | 18 (12–47) | 19 (11–33) | 0.981 |
Hospital LOS (days) | 36 (17–58) | 32 (14–47) | 39 (21–61) | 0.295 |
Mechanical ventilation (days) | 19 (11–35) | 16 (11–35) | 19 (11–35) | 0.832 |