All (n = 404) | NRBC positive (n = 305; 75.5%) | NRBC negative (n = 99; 24.5%) | p value | |
---|---|---|---|---|
Basic characteristics | ||||
Age (years) | 50 (37; 61) | 49 (38; 61.5) | 49 (33; 60) | n.s. |
Sex (male) (n) | 265 (65.6%) | 191 (62.6%) | 74 (74.7%) | < 0.05* |
Body mass index (kg/m2) | 26.2 (23.3; 30.8) | 26.2 (23.3; 30) | 26.5 (23.4; 31.9) | n.s. |
Severity of illness scores at ICU admission | ||||
SAPS II | 55 (39; 70) | 56 (40; 71) | 53 (36.5; 66) | n.s. |
APACHE II | 27 (20; 35) | 29 (21; 36) | 25.5 (19; 33) | < 0.05* |
SOFA II | 12 (9; 15) | 12 (9; 15) | 11 (8; 13) | < 0.001*** |
TISS-28 | 51 (43; 58) | 51 (43; 58) | 50 (43; 56) | n.s. |
Severity of ARDS | ||||
Mild (n) | 12 (3%) | 7 (2.3%) | 5 (5.1%) | n.s. |
Moderate (n) | 174 (43.1%) | 123 (40.3%) | 51 (51.5%) | < 0.05* |
Severe (n) | 207 (51.2%) | 168 (55.1%) | 39 (39.4%) | < 0.05* |
Pulmonary gas exchange and mechanical ventilation (at ICU admission) | ||||
Ppeak (cm H2O) | 35 (32; 39) | 35 (32; 39) | 34 (31; 38) | n.s. |
Pmean (cm H2O) | 24 (21; 28) | 24 (21.5; 28) | 23.4 (21; 27) | n.s. |
PEEP (cm H2O) | 17 (15; 20) | 17 (15; 20) | 16.7 (15; 20) | n.s. |
Delta P (cm H2O) | 18 (14.7; 21.6) | 18 (14.7; 21.2) | 18.7 (15; 22) | n.s. |
Tidal volume/PBW (ml/kg) | 5.9 (4.7; 7.4) | 5.8 (4.3; 7.2) | 6.75 (5.2; 7.9) | n.s. |
FiO2 | 93 (70; 100) | 93 (70; 100) | 91.5 (70; 100) | n.s. |
PaO2 (mmHg) | 135 (111; 170) | 136 (113; 179) | 123 (108; 165) | n.s. |
PaCO2 (mmHg) | 52 (42; 64) | 52 (43; 63.2) | 53.3 (41.8; 67.7) | n.s. |
PaO2/FiO2 | 163 (126; 204) | 165 (135; 225) | 139 (116; 183) | n.s. |
OI | 17.5 (11.8; 29.1) | 17.6 (12; 28.9) | 17.1 (11; 29.4) | n.s. |
Pulmonary compliance (ml/cmH2O) | 28.4 (19.4; 40.7) | 26.55 (17.5; 38.3) | 34.1 (24.7; 44.1) | < 0.001*** |
Mechanical ventilation (hours) | 448 (193; 743) | 484 (242; 825) | 308 (154; 527.25) | < 0.001*** |
ICU length of stay (days) | 20 (10; 35) | 22 (11; 38.5) | 14 (7; 26) | < 0.05* |
Etiology of ARDS | ||||
Pneumonia (n; %) | 221 (54.7%) | 168 (55.1%) | 53 (53.5%) | n.s. |
Sepsis (n; %) | 25 (6.2%) | 20 (6.6%) | 5 (5.1%) | n.s. |
Immune deficiency (n; %) | 61 (15.1%) | 47 (15.4%) | 14 (14.1%) | n.s. |
Acute-on-chronic (n; %) | 46 (11.4%) | 35 (11.5%) | 11 (11.1%) | n.s. |
Trauma (n; %) | 26 (6.4%) | 18 (5.9%) | 8 (8.1%) | n.s. |
Others (n; %) | 14 (3.5%) | 11 (3.6%) | 3 (3%) | n.s. |
Extracorporeal lung support | ||||
ECLS (n; %) | 231 (57.2%) | 192 (63%) | 39 (39.4%) | < 0.001*** |
pECLA (n; %) | 107 (26.5%) | 79 (25.9%) | 28 (28.3%) | n.s. |
ECMO (n; %) | 156 (38.6%) | 143 (46.9%) | 13 (13.1%) | < 0.001*** |
ECMO and pECLA (n; %) | 32 (7.9%) | 30 (9.8%) | 2 (2%) | < 0.001*** |
ICU mortality | 182 (45%) | 155 (50.8%) | 27 (27.3%) | < 0.001*** |