Shippam W, et al. - Among 40 healthy parturients, researchers compared pre-oxygenation using high-flow nasal oxygen (30–70 l.min⁻¹ oxygen flow) via nasal prongs with standard 15 l.min⁻¹ oxygen breathing via a tight-fitting facemask in this physiological study. Random allocation of participants to these two groups was done. The opted pre-oxygenation method was performed on each patient with both 3-min tidal volume breathing and 30s tidal breathing followed by eight vital capacity breaths. Compared with standard flow rate facemask pre-oxygenation, the performance of high-flow nasal oxygen pre-oxygenation was worse in healthy term parturients.