Table 2. Physiological Parameters at 0 and 30-minutes intervals.
| Parameter | Before T-Piece (Time "0") | Before PSV (Time “0") |
T-Piece Time "30" | PSV Time "30" |
|---|---|---|---|---|
| Respiratory rate (breaths/min) | 24.17 ± 5.74 | 22.28 ± 7.04 | 24.35 ± 6.39 | 23.69 ± 7.45 |
| Heart rate (beats/min) | 93.83 ± 14.94 | 90.40 ± 16.15 | 95.88 ± 13.39 | 92.94 ± 20.19 |
| Systolic arterial pressure (mmHg) | 135.42 ± 22.20 | 137.44 ± 24.75 | 138.67 ± 25.72 | 139.64 ± 22.52 |
| Arterial saturation (%) | 97.48 ± 2.82 | 97.34 ± 2.47 | 96.48 ± 3.80 | 96.88 ± 2.74 |
| Central venous saturation (%) | 72.34 ± 9.48 | 71.81 ± 10.24 | 71.74 ± 9.89 | 71.20 ± 8.64 |
| PaCO2 (mmHg) | 49.46 ± 11.02 | 49.53 ± 13.15 | - | - |
| PSV level (cmH2O) | 12.23 ± 2.61 | 12.38 ± 2.46 | - | - |
| PEEP level (cmH2O) | 6 (5–7) | 6 (5–7) | - | - |
| Minute ventilation (L/min) | 8.16 ± 3.50 | 8.38 ± 3.56 | 9.65 ± 3.39 | 8.72 ± 3.62 |
| RSBI (breaths/min/L) | 70.21 (45.06–95.36) | 69.67 (44.9–94.47) | 64.80 (42.3–87.3) | 63.95 (38–89.9) |
Plus-minus values are means ± SD or median and (interquartile range). SBT, spontaneous breathing trial; PSV, Pressure-Support Ventilation; PaCO2: carbon dioxide partial arterial pressure; PEEP: positive end-expiratory pressure; RSBI, Rapid Shallow Breathing Index. There were no significant differences between pairwise comparisons between the two study groups at time “30" or between these and baseline (all p-values > 0·05).