List of abbreviations AHI apnoea–hypopnoea index BMI body mass index COPD chronic obstructive pulmonary disease CPAP continuous positive airway pressure CT computed tomography ECG electrocardiography FEV1 forced expiratory volume in 1 s FVC forced vital capacity HRCT high-resolution computed tomography Hb haemoglobin KCO Transfer coefficient of the lung for carbon monoxide MRI magnetic resonance imaging NIV noninvasive ventilation OSAS obstructive sleep apnoea syndrome PaCO2 arterial carbon dioxide tension PaO2 arterial oxygen tension PtcCO2 transcutaneous carbon dioxide tension SaO2 arterial oxygen saturation SpO2 arterial oxygen saturation measured by pulse oximetry TLC total lung capacity TLCO Transfer factor of the lung for carbon monoxide V’E minute ventilation vii
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