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Oxygen saturation during apnoea (SaO2) in the virtual subject BMI35 kg m−2 in labour, during HFNO, closed glottis, and open airway with FiO2 21%. Closed glottis simulates failure of HFNO whereas FiO2 21% with end-tidal oxygen fraction (FE′O2) of 90% simulates facemask technique. HFNO, high flow nasal oxygen therapy.
