DAS: Difficult Airway Society; OSA: obstructive sleep apnea; HDU: high dependency unit; ICU: intensive care unit; O2: oxygen.
Reproduced from Popat M, Mitchell V, Dravid R, Patel A, Swampillai C, Higgs A. Difficult Airway Society Guidelines for the management of tracheal extubation. Anaesthesia 2012; 67: 318-340, with permission from the Association of Anaesthetists of Great Britain & Ireland/Blackwell Publishing Ltd.