End-Tidal oxygen measurement compared with patient factor assessment for determining preoxygenation time

H. A. Machlin, P. S. Myles, C. B. Berry, P. J. Butler, D. A. Story, B. J. Heath

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Time to adequate preoxygenation was assessed in 200 elective surgical patients, using measurement of end-tidal oxygen concentration. A variety of patient factors were assessed as to their ability to predict the time required to preoxygenate a patient. Of the 200 patients, 23 (11.5%) were unable to be adequately preoxygenated; most of these cases were due to a poor mask fit. The average time for preoxygenation was 154 seconds (range 43-364 seconds). Of those patients who could be preoxygenated, 46 (23%) required more than three minutes. Although a regression equation could be constructed to calculate time required for preoxygenation, the wide standard errors of the coefficients preclude a clinically useful predictive equation. We thus found that we could not accurately predict time required for preoxygenation and that a routine three minutes preoxygenation may not be sufficient for many patients. However, the measurement of end-tidal oxygen concentration is a very useful method of determining the end-point for preoxygenation.

Original languageEnglish
Pages (from-to)409-413
Number of pages5
JournalAnaesthesia and intensive care
Volume21
Issue number4
Publication statusPublished - 1993

Keywords

  • Anaesthesia
  • End-tidal
  • Measurement techniques
  • Monitoring
  • Oxygen
  • Paramagnetic
  • Preoxygenation

Cite this

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title = "End-Tidal oxygen measurement compared with patient factor assessment for determining preoxygenation time",
abstract = "Time to adequate preoxygenation was assessed in 200 elective surgical patients, using measurement of end-tidal oxygen concentration. A variety of patient factors were assessed as to their ability to predict the time required to preoxygenate a patient. Of the 200 patients, 23 (11.5{\%}) were unable to be adequately preoxygenated; most of these cases were due to a poor mask fit. The average time for preoxygenation was 154 seconds (range 43-364 seconds). Of those patients who could be preoxygenated, 46 (23{\%}) required more than three minutes. Although a regression equation could be constructed to calculate time required for preoxygenation, the wide standard errors of the coefficients preclude a clinically useful predictive equation. We thus found that we could not accurately predict time required for preoxygenation and that a routine three minutes preoxygenation may not be sufficient for many patients. However, the measurement of end-tidal oxygen concentration is a very useful method of determining the end-point for preoxygenation.",
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End-Tidal oxygen measurement compared with patient factor assessment for determining preoxygenation time. / Machlin, H. A.; Myles, P. S.; Berry, C. B.; Butler, P. J.; Story, D. A.; Heath, B. J.

In: Anaesthesia and intensive care, Vol. 21, No. 4, 1993, p. 409-413.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Heath, B. J.

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