Table 2 Comparisons of respiratory variables during spontaneous breathing trial and the maximal maneuver between extubation success and failure group
|  | Overall (n = 107) | Successful extubation (n = 50) | Unsuccessful extubation (n = 57) | p value |
|---|---|---|---|---|
Respiratory rate, bpm | 27 (6) | 24 (5) | 29 (6) |  < 0.001 |
Baseline VT, mL/kg | 4.6 [3.3, 5.5] | 5.3 [4.6, 5.7] | 3.3 [2.8, 5.1] |  < 0.001 |
Maximal VT, mL/kg | 9.3 [4.9, 11.4] | 11.1 [9.7, 14.1] | 5.0 [3.7, 8.9] |  < 0.001 |
ΔVT, mL/kg | 4.1 [1.7, 6.2] | 6.2 [4.8, 8.7] | 1.7 [1.1, 3.6] |  < 0.001 |
RSBI | 88 [62, 140] | 72 [58, 88] | 137 [78, 178] |  < 0.001 |
Baseline EAdi, μV | 5.9 [4.2, 8.0] | 7.8 [6.2, 9.4] | 4.3 [3.1, 5.7] |  < 0.001 |
Maximal EAdi, μV | 14.8 [6.8, 22.5] | 22.5 [19.8, 27.8] | 7.5 [4.6, 10.5] |  < 0.001 |
Rel EAdi, % | 48.5 [33.9, 58.8] | 32.7 [27.7, 39.9] | 57.9 [53.2, 65.6] |  < 0.001 |
ΔEAdi, μV | 8.1 [3.0, 15.6] | 15.7 [11.5, 19.0] | 3.1 [1.6, 5.0] |  < 0.001 |
ΔEAdi, % | 110 [70, 190] | 210 [150, 260] | 70 [50, 90] |  < 0.001 |
Baseline NVE, mL/μV | 51.6 [40.5, 67.1] | 44.1 [35.9, 52.9] | 60.6 [46.4, 74.1] |  < 0.001 |
Maximal NVE, mL/μV | 40.0 [31.5, 58.7] | 32.0 [28.3, 36.5] | 55.2 [41.9, 66.5] |  < 0.001 |
pH | 7.43 [7.41, 7.45] | 7.43 [7.41, 7.46] | 7.43 [7.41, 7.45] | 0.913 |
PaCO2, mmHg | 36.2 [32.1, 39.8] | 33.5 [30.7, 37.5] | 37.8 [34.9, 41.0] | 0.001 |
PaO2/FiO2, mmHg | 306.6 [248.3, 366.2] | 335.5 [285.1, 386.5] | 280.0 [220.8, 349.8] |  < 0.001 |
Bicarbonate, mmol/L | 24.0 [22.2, 26.5] | 23.0 [20.8, 24.7] | 25.9 [23.5, 27.6] |  < 0.001 |
Lac, mmol/L | 1.5 [1.1, 2.2] | 1.5 [0.9, 2.2] | 1.6 [1.1, 2.2] | 0.559 |