Table 3 Preoperative demographics and intraoperative data of patients 2 months before and after ventilator exchange after risk matching
Preoperative variable | Before vent exchange (n = 864) | After vent exchange (n = 864) | p |
|---|---|---|---|
Age (mean ± SD, yr) | 49 ± 16 | 48 ± 16 | 0.656 |
Male (n,%) | 358 (41%) | 362 (42%) | 0.884 |
Patient ASA 3,4 or 5 (n,%) | 198 (23%) | 188 (22%) | 0.603 |
Emergent Case (n,%) | 24 (3%) | 16 (2%) | 0.263 |
Predicted Body Weight (mean ± SD, kg) | 64 ± 10.5 | 63 ± 10.5 | 0.294 |
Weight (mean ± SD, kg) | 84 ± 23.5 | 84 ± 22.8 | 0.658 |
BMI (mean ± SD, kg/m 2 ) | 28.9 ± 7.4 | 29.0 ± 7.3 | 0.854 |
Smoker | |||
Former (n,%) | 141 (16%) | 134 (16%) | 0.693 |
Current (n,%) | 138 (16%) | 132 (15%) | 0.74 |
Lung Disease (n,%) | 3 (0.3%) | 5 (0.6%) | 0.726 |
Asthma (n,%) | 71 (8%) | 72 (8%) | 1 |
COPD (n,%) | 20 (2%) | 19 (2%) | 1 |
Diabetes (n,%) | 86 (10%) | 73 (8%) | 0.381 |
Hypertension (n,%) | 250 (29%) | 230 (27%) | 0.308 |
Coronary Artery Disease (n,%) | 23 (3%) | 18 (2%) | .527 |
Congestive Heart Failure (n,%) | 12 (1%) | 12 (1%) | 1 |
Chronic Kidney Disease (n,%) | 21 (2%) | 20 (2%) | 1 |
Hepatic Disease (n,%) | 11 (1%) | 11 (1%) | 1 |
Alcohol Abuse (n,%) | 27 (3%) | 21 (2%) | 0.464 |
Current Steroid Therapy (n,%) | 24 (3%) | 25 (3%) | 1 |
Intraoperative variable | Before vent exchange (n = 864) | After vent exchange (n = 864) | p |
Ventilatory Parameters (case medians) | |||
PIP (mean ± SD, cmH 2 O) | 25.3 ± 5.7 | 20.3 ± 6.2 | < 0.001 |
PEEP (mean ± SD, cmH 2 O) | 2.0 ± 1.3 | 1.5 ± 2.5 | < 0.001 |
ΔP (mean ± SD, cmH 2 O) | 23.3 ± 5.4 | 18.8 ± 5.6 | < 0.001 |
RR (mean ± SD, breath per minute) | 11.0 ± 2.3 | 10.5 ± 2.2 | < 0.001 |
Vt (mean ± SD, ml) | 587 ± 146 | 559 ± 125 | < 0.001 |
Vt cc/kg PBW (mean ± SD, ml) | 9.33 ± 2.22 | 8.98 ± 1.94 | < 0.001 |
FiO 2 (mean ± SD,%) | 55.5 ± 16 | 51.2 ± 18 | < 0.001 |
cc/kg PBW ≤ 6 (n,%) | 62 (7%) | 63 (7%) | 1 |
cc/kg PBW ≤ 8 (n,%) | 188 (22%) | 219 (34%) | 0.089 |
Epochs of 10 minutes: | |||
PIP > 30 cmH2O | 2.9 ± 6.4 | 1.4 ± 4.5 | < 0.001 |
Vt > 12 cc/kg PBW | 1.7 ± 4.3 | 0.9 ± 3.6 | < 0.001 |
Colloid use (n,%) | 51 (5.9%) | 47 (5.4%) | 0.755 |
Crystalloid volume (median, 25 th ,75 th , ml) | 1950 (1100, 2700) | 1900 (1000,2500) | 0.111 |
Case Length (mean ± SD, minutes) | 198 ± 103 | 195 ± 104 | 0.531 |
Transfusion (n,%) | 17 (2%) | 15 (2%) | 0.858 |
PRBC (n,%) | 16 (2%) | 15 (5%) | 1 |
FFP (n,%) | 2 (0.2%) | 4 (0.5%) | 0.683 |
Platelets (n,%) | 2 (0.2%) | 1 (0.1%) | 1 |