Table 3.
Change in dyspnea, breathing pattern, hemodynamics and blood gas between the initiation and end of the spontaneous breathing trial (SBT)
| SBT success (n = 17) | SBT failure (n = 14) | p value | |
|---|---|---|---|
| Dyspnea-VAS, mm | 0 (0–1) | 6 (4–8) | 0.006 |
| RR, min‒1 | 1 (− 2 to 3) | 8 (4–13) | 0.001 |
| Vt, ml | − 7 (− 74 to 80) | − 29 (− 89 to 50) | 0.844 |
| RR/Vt | 0 (− 9 to 27) | 11 (− 16 to 29) | 1.000 |
| Heart rate, min‒1 | 1 (− 3 to 2) | 7 (0–19) | 0.017 |
| Systolic blood pressure, mmHg | 2 (− 3 to 9) | 31 (5–62) | 0.020 |
| PaO2, mmHg | − 21 (− 40 to − 1.25) | − 21 (− 32.5 to 2) | 0.910 |
| PaCO2, mmHg | 0 (− 2 to 4) | 4 (2–12) | 0.161 |
| pH | 0.02 (− 0.02 to 0.03) | − 0.07 (− 0.12 to 0.01) | 0.171 |
| SaO2, % | − 1 (− 3 to 0) | − 4 (− 8 to − 3) | 0.036 |
The evolution is described by the difference in variables between the initiation and end of the spontaneous breathing trial
Data are provided as median (interquartile range) and number (%)
Dyspnea-VAS Dyspnea-Visual Analog Scale; RR respiratory rate; Vt tidal volume; IBW ideal body weight; SaO2 arterial saturation of oxygen