ABG	arterial blood gas analysis
ARDS	acute respiratory distress syndrome
COVID-19	coronavirus disease 2019
CRP	C-reactive protein
HFNC	heated humidified high-flow oxygen therapy
ICU	intensive care unit
IMCU	intermediate care unit
IV	invasive ventilation
FiO2	fraction of inspired oxygen
PaO2	arterial partial pressure of oxygen
PEEP	positive end-expiratory pressure
PNX	pneumothorax
PNM	pneumomediastinum
NLR	neutrophils to lymphocytes ratio
PS	pressure support
NIV	non-invasive ventilation
O2T	oxygen therapy
RA	room air
SARS-CoV-2	severe acute respiratory syndrome coronavirus 2