ARF	acute respiratory failure
ARISCAT (score)	Assess Respiratory Risk in Surgical Patients in Catalonia (score)
ARR	absolute risk reduction
CI	confidence interval
CO2	carbon dioxide
COPD	chronic obstructive pulmonary disease
COT	conventional oxygen therapy
CPAP	continuous positive airway pressure
GA	general anesthesia
HDU	high-dependency care unit
HFNOT	high-flow nasal oxygen therapy
ICU	intensive care unit
LOS	length of stay
NIV	noninvasive ventilation
NRS	noninvasive respiratory support
OR	odds ratio
OSA	obstructive sleep apnea
PACU	postanesthesia care unit
PaO2	arterial partial pressure of oxygen
PPCs	postoperative pulmonary complications
RCT	randomized controlled trial
RM	recruitment maneuver
RR	risk ratio
THRIVE	transnasal humidified rapid-insufflation ventilatory exchange