Baseline characteristics of the cohort of COPD survivors treated with non-invasive ventilation for acute respiratory failure (n = 110)
| Characteristics | |
|---|---|
| Data are expressed as mean (SD) unless otherwise specified. | |
| IQR, interquartile range; FEV1, forced expiratory volume in 1 second; Pao2, Paco2, arterial oxygen and carbon dioxide tensions; Fio2, fraction of inspired oxygen; ADL, Activities of Daily Living. | |
| Age (years) | 73.2 (7.6) |
| Sex (M:F) | 87:23 |
| Smoking habit (current/ex/never smoker) | 8/97/5 |
| Smoking history (pack-years) | 50 (31) |
| Pre-morbid MRC score (median, IQR) | 4 (3–4) |
| Pre-morbid Katz ADL score (median, IQR) | 5 (3.75–6) |
| Charlson’s co-morbidity score (median, IQR) | 1 (1–2) |
| No (%) on home oxygen before index admission | 57 (52%) |
| No (%) of patients with past history of intubation | 15 (14%) |
| No (%) of patients with past history of NIV | 36 (33%) |
| No of days in hospital in previous year(median, IRQ) | 22.5 (4–61.25) |
| FEV1 during previous 6 months (% predicted, n = 79) | 33.3 (16.6) |
| APACHE II | 19.4 (4.7) |
| Radiological evidence of pneumonia (yes/no) | 34/76 |
| Cor pulmonale by ECG (yes/no) | 35/75 |
| Initial respiratory rate (/min) | 26 (6) |
| Body mass index (kg/m2) | 20.2 (4.5) |
| Haemoglobin (g/dl) | 12.7 (1.9) |
| Albumin (g/dl) | 32.2 (5.4) |
| Initial Pao2/Fio2 ratio (kPa) | 37.9 (19.9) |
| Initial pH | 7.24 (0.005) |
| Initial Paco2 (kPa) | 11.2 (2.6) |