Table 2.
Respiratory parameters during the Spontaneous breathing trials
| Variable | NAVA (n = 20) | PSV (n = 20) | p value |
|---|---|---|---|
| RR (rpm) | 27 (17–30) | 26 (20–30) | 0.560 |
| Vt/Kg (mL/Kg) | 6.1 (5.5–6.5) | 5.5 (4.8–6.1) | 0.076 |
| ΔEAdi (μV) | 10.3 (5.2–22.9) | 10.2 (6.4–20.6) | 0.376 |
| TIvent (s) | 0.81 (0.66–1.11) | 0.76 (0.68–0.91) | 0.007 |
| NVE (mL/μV) | 34.5 (23.3–66.8) | 35.4 (19.9–46.8) | 0.920 |
| Paw (cmH2O) | 14.0 (12.9–15.2) | 11.2 (11–11.7) | <0.001 |
| pH | 7.46(7.42–7.49) | 7.46 (7.40–7.49) | 0.947 |
| pCO2 (mmHg) | 40 (35–43) | 40 (36–45) | 0.188 |
Values are medians (25%–75% interquartile range). RR respiratory rate, V T /kg tidal volume per kilogram of predicted body weight, ΔEAdi Delta Electrical activity of the diaphragm, TIvent ventilator inspiratory time, NVE neuroventilatory efficiency, calculated as tidal volume divided by ΔEAdi, Paw airway pressure. pH and pCO2 from blood gas analysis. The p values were obtained with the Wilcoxon sumrank test