Table 2.
Respiratory and haemodynamic characteristics by group at start of spontaneous breathing trial
| Characteristic |
ATC (n = 87) |
PSV (n = 93) |
p value |
| Heart rate, beats/minute | 91.5 ± 1.9 | 84.2 ± 1.9 | 0.85 |
| MAP, mmHg | 93.2 ± 1.8 | 91.9 ± 1.8 | 0.63 |
| PaCO2, mmHg | 43.5 ± 1.3 | 42.8 ± 1.2 | 0.60 |
| PaO2/FiO2 ratio | 269.8 ± 10.3 | 271.7 ± 10.8 | 0.79 |
| Respiratory rate, breaths/minute | 20.5 ± 0.7 | 20.5 ± 0.7 | 0.81 |
| Tidal volume, ml | 0.48 ± 0.1 | 0.47 ± 0.1 | 0.78 |
| Minute ventilation, L/minute | 8.7 ± 0.5 | 9.2 ± 0.4 | 0.40 |
| Fluid balance 24 hours before SBT, ml | -48. 9 ± 1322.0 | 36.2 ± 1282.4 | 0.67 |
Data are presented as mean ± standard deviation.
ATC = automatic tube compensation; f/VT = frequency to tidal volume ratio; MAP = mean arterial blood pressure; PaCO2 = partial carbon dioxide tension in arterial blood; PaO2/FiO2 = ratio of partial oxygen tension in arterial blood to fraction of inspired oxygen; PSV = pressure support ventilation; SBT = spontaneous breathing trial