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Ear oximetry in clinical practice.

B A Chaudhary, N K Burki

    The American Review of Respiratory Disease
    |January 1, 1978
    PubMed
    Summary

    The Hewlett-Packard ear oximeter accurately measures arterial oxygen saturation in pulmonary disease patients. However, it underestimates saturation in jaundiced patients due to elevated bilirubin levels.

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    Area of Science:

    • Medical Devices
    • Clinical Chemistry
    • Pulmonary Medicine

    Background:

    • Ear oximetry is a non-invasive method for assessing arterial oxygen saturation.
    • Jaundice, characterized by elevated serum bilirubin, can potentially interfere with spectrophotometric measurements.

    Purpose of the Study:

    • To evaluate the accuracy of the Hewlett-Packard ear oximeter in patients with pulmonary diseases and in jaundiced patients.
    • To determine the impact of serum bilirubin concentration on ear oximeter readings.

    Main Methods:

    • Comparison of arterial oxygen saturation measured by ear oximeter with values derived from arterial blood gas analysis (PO2).
    • Inclusion of patients with pulmonary diseases and jaundiced patients with varying bilirubin levels.
    • Statistical analysis including correlation coefficients and significance testing.

    Main Results:

    • Good correlation found between ear oximeter and arterial PO2-derived saturation in both pulmonary disease (r = +0.90) and jaundiced groups (r = +0.85).
    • Ear oximeter significantly underestimated arterial oxygen saturation in jaundiced patients (-6.06%).
    • Serum bilirubin concentration showed a strong positive correlation (r = +0.848) with the discrepancy in measurements for jaundiced patients.

    Conclusions:

    • The Hewlett-Packard ear oximeter is reliable for oxygen saturation monitoring in patients with pulmonary diseases.
    • Elevated serum bilirubin levels in jaundiced patients significantly affect ear oximeter accuracy, leading to underestimation of arterial oxygen saturation.
    • Clinical use of ear oximetry in jaundiced patients requires careful consideration of potential measurement errors.

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