Table 3.
PPI, respiratory variables and hemodynamic variables before and after SBT
| Successful weaning (n = 25) | Failed SBT (n = 7) | Reintubation (n = 11) | P value | |
|---|---|---|---|---|
| SBP (mmHg) | ||||
| Before SBT | 129 ± 16 | 134 ± 24 | 124 ± 15 | 0.596 |
| By the end of SBT | 127 ± 18 | 119 ± 34 | 124 ± 13 | 0.647 |
| Heart rate (beat per minute) | ||||
| Before SBT | 97 ± 18 | 110 ± 30 | 96 ± 14 | 0.311 |
| By the end of SBT | 98 ± 16 | 106 ± 27 | 98 ± 14 | 0.576 |
| Respiratory rate/min | ||||
| Before SBT | 11 (16, 23) | 28 (25, 34)* | 24 (20, 27) | 0.002 |
| By the end of SBT | 19 (15, 24) | 30 (24, 34)* | 25 (23,26) | 0.003 |
| RSBI | ||||
| Before SBT | 41 (27, 68) | 83 (49,100)* | 67 (44, 74) | 0.011 |
| By the end of SBT | 36 (26, 55) | 85 (29, 99)* | 58 (40,71) | 0.007 |
| PPI | ||||
| Before SBT | 2.4 (0.74, 3.5) | 6.7 (1.1, 13) | 1.3 (0.74, 7.1) | 0.581 |
| At 15 min | 3 (0.9, 5) | 3 (0.3, 8.8) | 2.3 (0.7, 8.2) | 0.986 |
| By the end of SBT | 3.5 (1.6, 6.1) | 3.8 (1.4, 7.7) | 2.1 (0.67, 7.4) | 0.674 |
| PPI ratio | ||||
| At 15 min | 1.1 (0.99, 1.7) | 0.7 (0.65, 0.8)* | 1 (0.8,1.3) | 0.009 |
| At the end of SBT | 1.8 (1.3, 2.3) | 0.7 (0.5, 1)* | 1 (0.9, 1.4)* | < 0.001 |
| Respiratory rate ratio | 1 (0.9, 1.1) | 1 (0.9,1.1) | 1.1 (1, 1.2) | 0.336 |
| RSBI ratio | 1.1 (0.99, 1.2) | 1 (0.95, 1.1) | 1 (0.98, 1.4) | 0.346 |
Data are presented as mean ± standard deviation and median (quartiles)
PPI peripheral perfusion index, RSBI rapid shallow breathing index, SBT spontaneous breathing trial. *Denotes significance in relation to the successful weaning group