Pulse oximetry from the nasal septum

Tiberiu Ezri, Samuel Lurie*, Sergio Konichezky, David Soroker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Study Objective: To evaluate the accuracy of the nasal septum site for pulse oximetry measurement of arterial oxyhemoglobin saturation (SpO2) in hypothermic patients. Design: Prospective study. Setting: Operating theater of a public hospital. Patients: Fourteen hypothermic (temperature 34.6°C to 36°C) patients (eight males and six females) undergoing a major surgical abdominal procedure. Interventions: Fifty estimations of SpO2 were simultaneously made by a flex sensor probe applied at the nasal septum site and by a finger sensor probe using a pulse oximeter. The results were compared with arterial oxygen saturation (SaO2) as measured by arterial blood gas sampling. Measurements and Main Results: In 18% of the estimations, the finger probe produced unmeasurable results. The nasal septum probe did not produce any unmeasurable results (p = 0.0055). In the remaining 41 estimations, a comparison of the measurements from the nasal septum versus the controls showed a mean difference of 0.15 and a limit of agreement of -0.106 to +0.398. A comparison of the measurements from the finger probe versus the controls showed a mean difference of 2.27 and a limit of agreement of 1.986 to 2.551. Conclusion: Monitoring SpO2 at the nasal septum site is more reliable than monitoring it at the finger site in hypothermic patients.

Original languageEnglish
Pages (from-to)447-450
Number of pages4
JournalJournal of Clinical Anesthesia
Issue number6
StatePublished - 1991
Externally publishedYes


  • Pulse oximetry
  • blood gas monitoring
  • hypothermia
  • nasal septum
  • oxygen consumption


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