Gas exchange indices
| Day 0 | Day 1 | Day 5 | p Value* | |
|---|---|---|---|---|
| PaO2/FiO2 ratio (kPa) | ||||
| Control | 36.21±11.29 N=82 | 35.56±11.77 N=82 | 35.16±11.36 N=75 | 0.653 |
| Drain | 31.01±8.92 N=52 | 37.18±10.7 N=52 | 39.85±12.8 N=38 | <0.0001 |
| Oxygenation index (kPa/cm H2O) | ||||
| Control | 3.6±1.75 N=75 | 3.93±2.57 N=75 | 3.45±1.53 N=43 | 0.413 |
| Drain | 2.88±1.10 N=40 | 3.49±1.73 N=40 | 4.06±1.73 N=29 | <0.0001 |
| Ventilation index (cm H2O/kPa/min) | ||||
| Control | 13.87±4.49 N=45 | 14.26±4.92 N=45 | 15.46±4.16 N=37 | 0.298 |
| Drain | 20.15±8.85 N=30 | 17.39±7.81 N=30 | 17.57±5.65 N=21 | 0.325 |
Data are presented as mean±SD of N observations; day 0=prior to drainage.
*One-way ANOVA with repeated measures.
ANOVA, analysis of variance; FiO2, fractional inspired oxygen; PaO2, arterial oxygen tension.