Table 1.
Ventilatory parameters during the study protocol.
| Parameter | Baseline values (Phase 1) | End values (Phase 6) | p Wilcoxon test |
|---|---|---|---|
| Expiratory tidal volume, mL | 469 (426–494) | 473 (424–498) | 0.91 |
| Respiratory rate*, b/min | 20 (20–22) | 20 (20–22) | — |
| Inspiratory to expiratory time ratio* | 0.5 | 0.5 | — |
| Fraction of inspired oxygen*, % | 25 (25–30) | 25 (25–30) | — |
| End-tidal carbon dioxide concentration, mmHg | 43 (40–44) | 42 (40–44) | 0.12 |
| Peripheral capillary oxygen saturation, % | 98 (97–100) | 98 (96–100) | 0.91 |
| Minute ventilation, L/min | 9.2 (8.9–9.5) | 9.3 (8.9–9.5) | 0.47 |
| Peak airway pressure, cmH2O | 23 (21–26) | 25 (24–26) | 0.07 |
| Positive end-expiratory pressure*, cmH2O | 5 | 5 | — |
| Compliance, ml/cmH2O | 32 (31–42) | 31 (30–39) | 0.07 |
Data are presented as median and interquartile range (Q1–Q3).
*Preset parameter.