Comparison of four methods of preoxygenation

Br J Anaesth. 1990 May;64(5):571-6. doi: 10.1093/bja/64.5.571.


We studied four different techniques of preoxygenation in 20 healthy volunteers, by continuous analysis of respired gases. Three minutes of tidal breathing from a Magill breathing system or four vital capacity breaths from a non-rebreathing system were found to be equally effective, whereas four vital capacity breaths from a Magill breathing system were less effective. Maximal expiration before application of the face mask resulted in improved oxygenation when four vital capacity breaths were taken from a Magill system.

Publication types

  • Clinical Trial
  • Comparative Study
  • Randomized Controlled Trial

MeSH terms

  • Adult
  • Anesthesia, Inhalation / methods*
  • Carbon Dioxide / physiology
  • Female
  • Humans
  • Male
  • Oxygen / administration & dosage*
  • Oxygen / physiology
  • Respiration / physiology*
  • Tidal Volume
  • Time Factors
  • Vital Capacity / physiology


  • Carbon Dioxide
  • Oxygen