| 6MWD | six minutes walking distance |
| 6MWT | six minutes walking test |
| AECOPD | acute exacerbations of chronic obstructive pulmonary disease |
| BMI | body mass index |
| COPD | chronic obstructive pulmonary disease |
| EBM | evidence-based medicine |
| ECG | electrocardiography |
| FEV1 | forced expiratory volume in 1 s |
| CSs | corticosteroids |
| GR | glucocorticoids receptor |
| ICS | inhaled corticosteroids |
| LTOT | long term oxygen therapy |
| MMSE | mini-mental state examination |
| MoCa | Montreal cognitive assessment |
| MRC | medical research council |
| MRF26 | Maugeri foundation respiratory failure questionnaire |
| PR | pulmonary rehabilitation |
| PRU | pulmonary rehabilitation unit |
| QoL | quality of life |
| SD | standard deviation |
| SF-36 | 36-item short form health survey general |
| SGRQ | Saint George’s respiratory questionnaire |
| SNPs | single nucleotide polymorphisms |
| Δ6MWD | delta6MWD (difference between 6MWD in dismission and admission in meters) |
| ΔFEV1 | deltaFEV1 (difference between values of FEV1 in dismission and admission in percentage) |
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