Table 1.
Descriptive characteristics of 222 chronic obstructive pulmonary disease patients with acute respiratory failure treated with invasive mechanical ventilation admitted to Silkeborg Hospital, Denmark 1994–2004
| Hemoglobin |
|||
|---|---|---|---|
| <7.4 mmol/L (12.0 g/dL) n (%) | 7.4–9.3 mmol/L (12.0–15.0 g/dL) n (%) | >9.3 mmol/L (15.0 g/dL) n (%) | |
| Gender | |||
| Female | 20 (9.0%) | 77 (34.7%) | 25 (11.3%) |
| Male | 22 (10.0%) | 55 (25.0%) | 23 (10.4%) |
| Age (years) | |||
| <65 | 10 (4.5%) | 49 (22.1%) | 15 (6.8%) |
| 65–75 | 16 (7.2%) | 47 (21.2%) | 26 (11.7%) |
| >75 | 16 (7.2%) | 36 (16.2%) | 7 (3.2%) |
| Comorbidity levela | |||
| Low | 9 (4.1%) | 53 (23.9%) | 16 (7.2%) |
| Medium | 23 (10.4%) | 61 (27.5%) | 26 (11.7%) |
| High | 10 (4.5%) | 18 (8.1%) | 6 (2.7%) |
| pH | |||
| <7.15 | 7 (3.2%) | 29 (13.1%) | 9 (4.1%) |
| 7.15–7.30 | 14 (6.3%) | 55 (25%) | 22 (10%) |
| >7.30 | 21 (9.5%) | 48 (21.6%) | 17 (7.7%) |
a
Note: Three levels of the index were defined: low (Charlson Index Score), corresponding to patients with no underlying diseases implemented in the Charlson Index, medium (Charlson Index Score 1–2), and high (Charlson Index Score >2).