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Related Experiment Videos

Artifactual pulse-oximetry estimation in neonates

H U Bucher1, M Keel, M Wolf

  • 1Department of Obstetrics and Gynaecology, University Hospital, Zurich, Switzerland.

Lancet (London, England)
|May 7, 1994
PubMed
Summary

Inaccurate pulse oximetry readings in neonates can occur due to excessive pressure from sensor placement or venous congestion. Clinicians should carefully check pulse oximetry values for these common sources of error.

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Area of Science:

  • Neonatal Medicine
  • Biomedical Engineering
  • Clinical Monitoring

Background:

  • Pulse oximetry is crucial for monitoring oxygenation in neonates.
  • Artifactual readings can lead to misdiagnosis and inappropriate treatment.
  • Common causes of pulse oximetry error require further investigation.

Purpose of the Study:

  • To investigate two common sources of artifactual pulse oximetry readings in neonates.
  • To quantify the impact of excessive tissue pressure and venous congestion on pulse oximetry accuracy.

Main Methods:

  • Twenty neonates were studied.
  • Inappropriate sensor fixation was simulated using a blood pressure cuff to mimic increased tissue pressure.
  • Venous congestion was induced at specific pressures (30 and 40 mm Hg).

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  • Errors in arterial oxygen saturation (pSO2) were assessed against established thresholds (2 SD > 3%).

    • Main Results:

    • Excessive pressure (50 mm Hg) caused pSO2 errors exceeding 2 SD in 25% of subjects.
    • Similar errors were observed when nurses applied sensors inappropriately.
    • Venous congestion at 30 mm Hg induced pSO2 errors in 15% of subjects.
    • Venous congestion at 40 mm Hg induced pSO2 errors in 30% of subjects.
    • Pulse rate detection remained normal despite induced errors in pSO2.

    Conclusions:

    • Inappropriate sensor fixation leading to increased tissue pressure is a significant source of neonatal pulse oximetry error.
    • Venous congestion can also compromise the accuracy of pulse oximetry measurements in neonates.
    • Pulse oximeter values in neonates require careful scrutiny to identify and mitigate these common artifactual errors.