Table 2. Clinical variables at baseline and at 2 minutes of the spontaneous breathing trial.
| Baseline | 2 min | p valuea | |
|---|---|---|---|
| Heart Rate (beats/min) | |||
| Weaning Success | 86 ± 18 | 87 ± 18 | <0.001 |
| Extubation failure | 96 ± 18 | 94 ± 13 | 0.52 |
| Systolic arterial blood pressure (mmHg) | |||
| Weaning Success | 132 (121–151) | 137 (121–156) | 0.001 |
| Extubation failure | 136 (130–146) | 130 (123–159) | 0.42 |
| CVP (mmHg) | |||
| Weaning Success | 10 (7–13) | 10 (6–12) | 0.018 |
| Extubation failure | 8 (6–12) | 12 (9–16) | 0.001 |
| dCVP (mmHg) | |||
| Weaning Success | 0 (-2-0.5) | <0.0001§ | |
| Extubation failure | 3 (2–4) | ||
| Respiratory Rate (breaths/min) | |||
| Weaning Success | 18 (15–22) | 20 (17–24) | <0.001 |
| Extubation failure | 18 (13–25) | 19 (17–24) | 0.08 |
| SaO2 (%) | |||
| Weaning Success | 96 (95–98) | 97 (95–99) | 0.33 |
| Extubation failure | 97 (95–98) | 96 (93–100) | 0.83 |
Continuous variables are expressed as mean ± SD or median (interquartile range)
SBT spontaneous breathing trial, CVP central venous pressure, dCVP change in CVP from baseline to 2-minutes after starting SBT, SaO2 arterial oxygen saturation.
ap values represent statistical comparisons between variables comparing 2 min to baseline by paired t-test or Wilcoxon rank-sum test as appropriate.
§ p-value compares dCVP at 2 minutes between groups