Table 2.
Dyspnea, breathing pattern, hemodynamics and blood gas at the initiation and end of the spontaneous breathing trial
| Initiation of SBT | End of SBT | |||||||
|---|---|---|---|---|---|---|---|---|
| All patients n = 31 | SBT success n = 17 | SBT failure n = 14 | p value | All patients n = 31 | SBT success n = 17 | SBT failure n = 14 | p value | |
| Dyspnea-VAS, mm | 2 (0–2) | 0 (0–2) | 2 (2–5) | 0.188 | 4 (0–10) | 0 (0–4) | 10 (8–10) | 0.003 |
| RR, min‒1 | 23 (20–28) | 20 (17–23) | 28 (24–31) | 0.001 | 27 (20–35) | 22 (16–25) | 35 (32–40) | 0.001 |
| Vt, ml | 380 (328–476) | 453 (372–557) | 336 (283–388) | 0.004 | 437 (334–551) | 450 (370–563) | 345 (271–513) | 0.109 |
| RR/Vt, min‒1·ml‒1 | 48 (41–77) | 45 (31–63) | 77 (50–95) | 0.031 | 54 (39–74) | 52 (35–68) | 75 (47–113) | 0.625 |
| Heart rate, min‒1 | 93 (83–102) | 88 (72–105) | 96 (89–102) | 0.014 | 95 (83–110) | 87 (76–101) | 99 (91–114) | 0.001 |
| Systolic blood pressure, mmHg | 136 (127–146) | 136 (130–151) | 132 (123–146) | 0.233 | 143 (135–171) | 139 (130–152) | 158 (138–200) | 0.016 |
| PaO2, mmHg | 89 (79–120) | 113 (79–130) | 86 (73–94) | 0.039 | 64 (59–78) | 65 (60–86) | 62 (65–75) | 0.218 |
| PaCO2, mmHg | 37 (32–46) | 36 (32–42) | 44 (33–52) | 0.406 | 40 (35–45) | 37 (34–41) | 44 (41–66) | 0.106 |
| pH | 7.45 (7.39–7.47) | 7.43 (7.38–7.48) | 7.45 (7.42–7.48) | 0.212 | 7.42 (7.38–7.49) | 7.42 (7.41–7.50) | 7.39 (7.29–7.45) | 0.150 |
| SaO2, % | 97 (95–100) | 98 (95–100) | 97 (94–98) | 0.462 | 93 (92–95) | 95 (93–99) | 91 (88–93) | 0.005 |
SBT spontaneous breathing trial; Dyspnea-VAS Dyspnea-Visual Analog Scale; RR respiratory rate; Vt tidal volume; IBW ideal body weight; SaO2 arterial saturation of oxygen
Data are provided as median (interquartile range) and number (%)