Table 1.
Patient characteristics
| Characteristics | FreeO2 patients (n=25) | Control patients (n=25) |
|---|---|---|
| Age (years) | 71±8 | 73±8 |
| Men, n (%) | 15 (60) | 12 (48) |
| ED admission to inclusion (days) | 0.6±0.7 | 0.6±1.1 |
| Spirometry during stable statea | ||
| FEV1 (L) | 1.1±0.3 | 1.1±0.4 |
| FEV1 (% predicted) | 40±11 | 51±20 |
| FEV1/FVC (%) | 41±0.11 | 47±20 |
| Spirometry during hospital stayb | ||
| FEV1 (L) | 1.0±0.5 | 1.0±0.5 |
| FEV1 (% predicted) | 36±19 | 38±24 |
| FEV1/FVC (%) | 45±12 | 49±13 |
| Physiologic data at study inclusion | ||
| O2 flow (L/min) | 2.0±1.0 | 2.0±1.0 |
| pH | 7.40±0.05 | 7.39±0.05 |
| PaCO2 (mmHg) | 46±12 | 46±11 |
| HCO3− (mmol/L) | 28±5 | 27±5 |
| SpO2 (%) | 93±2 | 93±2 |
| Body temperature (°C) | 36.6±0.6 | 36.7±0.6 |
| Respiratory rate (breaths/min) | 22±3 | 21±2 |
Notes: Data expressed as mean ± SD, unless otherwise specified.
a
Forced spirometry performed within 1 year before or after hospitalization, during a stable state (value available for 62% of the patients).
b
Forced spirometry performed during the hospital stay (available for all patients).
Abbreviations: ED, emergency department; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; SD, standard deviation.