Preoperative variable | Before vent exchange (n = 13,250) | After vent exchange (n = 13,250) | p |
---|---|---|---|
Age (mean ± SD, yr) | 51 ± 16 | 50 ± 16 | < 0.001 |
Male (n,%) | 5932 (45%) | 5956 (45%) | 0.776 |
Patient ASA 3,4 or 5 (n,%) | 3788 (28.6%) | 3604 (27.2%) | 0.012 |
Emergent Case (n,%) | 591 (4.5%) | 588 (4.4%) | 0.952 |
Predicted Body Weight (mean ± SD, kg) | 63 ± 10.6 | 64 ± 10.6 | 0.247 |
Weight (mean ± SD, kg) | 83 ± 22 | 83 ± 22 | 0.568 |
BMI (mean ± SD, kg/m 2 ) | 29 ± 7 | 29 ± 7 | 0.906 |
Smoker | |||
Former (n,%) | 2410 (18.2%) | 2637 (19.9%) | < 0.001 |
Current (n,%) | 2182 (16.5%) | 2195 (16.6%) | 0.843 |
Lung Disease (n,%) | 37 (0.3%) | 33 (0.2%) | 0.72 |
Asthma (n,%) | 1054 (8%) | 998 (7.5%) | 0.206 |
COPD (n,%) | 664 (5%) | 643 (4.9%) | 0.57 |
Diabetes (n,%) | 1531 (12%) | 1477 (11%) | 0.305 |
Hypertension (n,%) | 4670 (35%) | 4366 (33%) | < 0.001 |
Coronary Artery Disease (n,%) | 1028 (8%) | 989 (7%) | 0.379 |
Congestive Heart Failure (n,%) | 307 (2%) | 323 (2%) | 0.545 |
Chronic Kidney Disease (n,%) | 616 (5%) | 605 (5%) | 0.77 |
Hepatic Disease (n,%) | 212 (2%) | 277 (2%) | 0.003 |
Alcohol Abuse (n,%) | 467 (4%) | 396 (3%) | 0.015 |
Current Steroid Therapy (n,%) | 304 (2%) | 415 (3%) | < 0.001 |
Intraoperative Variable | Before vent exchange (n = 13,250) | After vent exchange (n = 13,250) | p |
Ventilatory Parameters (case medians) | |||
PIP (mean ± SD, cmH 2 O) | 25.5 ± 6 | 20 ± 6 | < 0.001 |
PEEP (mean ± SD, cmH 2 O) | 1.9 ± 1.2 | 2.7 ± 2.8 | 0.257 |
ΔP (mean ± SD, cmH 2 O) | 23.6 ± 6 | 17.3 ± 6 | < 0.001 |
RR (mean ± SD, breath per minute) | 11 ± 2.5 | 11 ± 2.5 | < 0.001 |
Vt (mean ± SD, ml) | 590 ± 144 | 541 ± 120 | < 0.001 |
Vt cc/kg PBW (mean ± SD, ml) | 9.41 ± 2.26 | 8.62 ± 1.96 | < 0.001 |
FiO 2 (mean ± SD) | 55 ± 16 | 54 ± 19 | < 0.001 |
cc/kg PBW ≤ 6 (n,%) | 953 (7%) | 1223 (9%) | < 0.001 |
cc/kg PBW ≤ 8 (n,%) | 2915 (22%) | 4584 (35%) | < 0.001 |
Epochs of 10 minutes: | |||
PIP > 30 cmH2O | 3.2 ± 7.1 | 1.1 ± 4 | < 0.001 |
Vt > 12 cc/kg PBW | 2 ± 4.8 | 0.7 ± 3.1 | < 0.001 |
Colloid use (n,%) | 1202 (9%) | 1157 (9%) | 0.343 |
Crystalloid volume (median, 25 th ,75 th , ml) | 2000 (1300,3000) | 2000 (1500,3000) | < 0.001 |
Case Length (mean ± SD, minutes) | 215 ± 122 | 197 ± 116 | < 0.001 |
Transfusion (n,%) | 560 (4%) | 554 (4%) | 0.878 |
PRBC (n,%) | 509 (4%) | 513 (4%) | 0.924 |
FFP (n,%) | 103 (0.8%) | 91 (0.7%) | 0.428 |
Platelets (n,%) | 64 (<0.5%) | 60 (<0.5%) | 0.787 |