Table 6 Blood gas analysis during the SBT
Factor | Weaning success n = 60 | Weaning failure n = 64 | OR [95% KI] | p value |
|---|---|---|---|---|
PaCO2 > 45 mmHg at admission, n (%) | ||||
No | 35 (53%) | 31 (47%) | 1 | 0.23 |
Yes | 24 (42%) | 33 (58%) | 0.64 [0.32, 1.32] | |
Missing | 1 | 0 | ||
PaCO2 prior to the first SBT (mmHg) | ||||
Mean ± SD | 40 ± 7 | 45 ± 14 | 0.61 [0.41, 0.93] | 0.021 |
Median (IQR) | 40 (36–43) | 44 (36–54) | ||
Min–max | 18–59 | 23–115 | ||
Missing | 1 | 1 | ||
PaCO2 > 45 mmHg prior to the first SBT, n (%) | ||||
No | 50 (56%) | 39 (44%) | 1 | 0.006 |
Yes | 9 (27%) | 24 (73%) | 0.29 [0.12, 0.70] | |
PaCO2 after the first SBT (mmHg) | ||||
Mean ± SD | 45 ± 9 | 55 ± 12 | 0.40 [0.26, 0.62] | < 0.0001 |
Median (IQR) | 43 (39–48) | 54 (47–63) | ||
Min–max | 32–81 | 29–89 | ||
Missing | 2 | 10 | ||
pH values after the first SBT | ||||
Mean ± SD | 7.46 ± 0.05 | 7.41 ± 0.09 | 3.23 [1.66, 6.31] | 0.0006 |
Median (IQR) | 7.46 (7.44–7.49) | 7.42 (7.36–7.46) | ||
Min–max | 7.36–7.56 | 7.19–7.67 | ||
Missing | 3 | 10 | ||
pH values prior to the first SBT | ||||
Mean ± SD | 7.50 ± 0.06 | 7.49 ± 0.09 | 1.15 [0.71, 1.86] | 0.58 |
Median (IQR) | 7.49 (7.46–7.54) | 7.49 (7.42–7.56) | ||
Min–max | 7.40–7.68 | 7.26–7.68 | ||
Missing | 1 | 1 | ||
PaO2 prior to the first SBT (mmHg) | ||||
Mean ± SD | 74 ± 19 | 80 ± 30 | 0.91 [0.78, 1.06] | 0.22 |
Median (IQR) | 75 (61–87) | 72 (60–97) | ||
Min–max | 34–115 | 37–169 | ||
Missing | 3 | 5 | ||
PaO2 values at the end of the first SBT | ||||
Mean ± SD | 71 ± 24 | 85 ± 41 | 0.88 [0.77, 1.00] | 0.056 |
Median (IQR) | 65 (52–79) | 70 (62–97) | ||
Min–max | 42–139 | 32–231 | ||
Missing | 6 | 13 | ||