Comparison of differences in respiratory parameters from baseline with the two modes of ventilation
| Baseline | PAV | Baseline | PSV | PAV – PSV (95% CI) | |
|---|---|---|---|---|---|
| Results are mean (SD). | |||||
| PAV=proportional assist ventilation; PSV=bilevel pressure support ventilation; PAV – PSV = mean difference between PAV and PSV; Sao2=oxygen saturation; 95% CI = upper and lower 95% confidence intervals; Tcco2=transcutaneous carbon dioxide; Ve=minute ventilation; RR=respiratory rate; Vt=tidal volume; Vt/Ti=mean inspiratory flow rate; Ti/Tot=inspiratory time as a ratio of the duty cycle (n=12). | |||||
| *Difference from baseline with PSV, p<0.05. †Difference from baseline with PAV, p<0.05. ‡Difference between PAV and PSV. | |||||
| Sao2 (%) | 94.5 (3.3) | 96.1 (2.2) | 94.1 (5.5) | 96.3 (2.2) | −0.17 (−1.46 to 1.12) |
| Tcco2 (kPa) | 6.0 (0.8) | 5.1 (0.9)† | 5.9 (0.7) | 4.9 (0.9)* | 0.16 (−0.28 to 0.60) |
| Ve (l/min) | 8.0 (1.3) | 14.3 (4.1)† | 8.1 (1.6) | 15.5 (6.0)* | −1.23 (−4.64 to 2.18) |
| RR (breaths/min) | 19.5 (5.6) | 17.0 (4.2) | 19.4 (5.9) | 16.9 (3.8) | 0.08 (−1.44 to 1.60) |
| Vt (l) | 0.44 (0.14) | 0.91 (0.39)† | 0.47 (0.20) | 0.98 (0.58)* | −0.09 (−0.31 to 0.13) |
| Vt/Ti (l/s) | 0.39 (0.10) | 0.78 (0.31)† | 0.40 (0.10) | 0.88 (0.38)* | −0.11 (−0.31 to 0.08) |
| Ti/Ttot | 0.37 (0.04) | 0.45 (0.11)† | 0.38 (0.04) | 0.33 (0.04)* | 0.12‡ (0.05 to 0.18) |