| ARDS | Acute respiratory distress syndrome |
| ARF | Acute respiratory failure |
| BAL | Bronchoalveolar lavage |
| BP | Blood pressure |
| COPD | Chronic obstructive pulmonary disease |
| COT | Conventional oxygen therapy |
| CPAP | Continuous positive airway pressure |
| EBUS | Endobronchial ultrasound |
| ETI | Endotracheal intubation |
| FB | Flexible bronchoscopy |
| FEV1 | Forced expiratory volume in one second |
| FiO2 | Fraction of inspired oxygen |
| GOLD | Global Initiative for Chronic Obstructive Lung Disease |
| HFT | High-flow therapy |
| HR | Heart rate |
| ICU | Intensive care unit |
| IMV | Invasive mechanical ventilation |
| IPAP | Inspiratory positive airway pressure |
| LOS | Length of stay (hospital/ICU) |
| ND | Not defined |
| NIV | Non-invasive ventilation |
| NIPPV | Non-invasive positive pressure ventilation |
| OSA | Obstructive sleep apnoea |
| PaCO2 | Partial pressure of carbon dioxide in arterial blood |
| PaO2 | Partial pressure of oxygen in arterial blood |
| PaO2/FiO2 | Ratio of arterial oxygen partial pressure to inspired oxygen fraction |
| PEEP | Positive end-expiratory pressure |
| RR | Respiratory rate |
| SpO2 | Peripheral capillary oxygen saturation |
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