Table 1.
Baseline patient characteristics
| Characteristics | All patients (n = 22) |
|---|---|
| Age, years | 59 ± 17 |
| Female sex, n % | 9 (41) |
| Body mass index, kg/mt2 | 32 ± 9 |
| Charlson comorbidity index | 3 ± 2 |
| APACHE II at ICU admission | 14 ± 8 |
| SOFA (day of the study) | 5 ± 3 |
| SOFA (peak during ICU) | 7 ± 3 |
| PaO2/FiO2 (lowest value during MV), mmHg | 136 ± 56 |
| Length of mechanical ventilation, days | 8 ± 4 |
| Characteristics at the end of the SBT | |
| Heart rate, bpm | 90 ± 12 |
| Systolic arterial pressure, mmHg | 145 ± 23 |
| Diastolic arterial pressure, mmHg | 99 ± 16 |
| Mean arterial pressure, mmHg | 76 ± 18 |
| Respiratory rate, bpm | 22 ± 5 |
| Tidal volume, ml | 479 ± 133 |
| P 0.1, cmH2O | 0.77 ± 0.99 |
| PaO2/FiO2 | 242 ± 67 |
| PaCO2, mmHg | 36 ± 5 |
| pH | 7.46 ± 0.05 |
Abbreviations: APACHE: Acute Physiology and Chronic Health Evaluation; SOFA: Sequential Organ Failure Assessment; ICU: intensive care unit; AHRF: acute hypoxemic respiratory failure; MV: mechanical ventilation; SBT: spontaneous breathing trial; P 0.1: airway occlusion pressure at 100 ms; PaCO2: partial pressure of carbon dioxide. Variables are expressed as the mean ± standard deviation