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Evaluation of two oxygen analyzers by computerized data acquisition and processing.

K Erdmann, J P Jantzen, C Etz

    Journal of Clinical Monitoring
    |April 1, 1986
    PubMed
    Summary
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    Accurate monitoring of inspired oxygen during anesthesia is essential. A polarographic oxygen monitor responded twice as fast as a galvanic unit, though both adequately measured oxygen concentration during nitrous oxide anesthesia.

    Area of Science:

    • Anesthesiology
    • Biomedical Engineering
    • Medical Device Technology

    Background:

    • Monitoring inspired oxygen concentration during anesthesia with nitrous oxide is crucial.
    • Accurate and rapid oxygen monitors are necessary for patient safety.
    • Two common oxygen monitoring devices, galvanic and polarographic, were assessed.

    Purpose of the Study:

    • To evaluate the response patterns of galvanic and polarographic oxygen monitors to rapid changes in oxygen concentration.
    • To compare the speed and accuracy of these devices under various gas flow rates and mixtures.
    • To determine the clinical relevance of response time differences.

    Main Methods:

    • Evaluated galvanic and polarographic oxygen monitors.
    • Recorded response patterns to stepwise changes in oxygen and nitrous oxide mixtures.

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  • Measured response times (T90) at gas flow rates from 2 to 10 L/min.
  • Utilized analog-to-digital conversion for data storage.

    • Main Results:

    • Both units accurately measured absolute oxygen concentration.
    • The polarographic unit was approximately twice as fast as the galvanic unit.
    • Response times (T90) were consistent for increases and decreases in oxygen concentration.
    • At 10 L/min, polarographic T90 was 5.8s (0-100% O2), galvanic T90 was 11.4s (p<0.01).
    • Increased gas flow rates delayed response times for both monitors.

    Conclusions:

    • Both galvanic and polarographic oxygen sensors provide adequate performance for routine clinical use during anesthesia.
    • The faster response of the polarographic device, while not clinically critical, may offer advantages in calibration.
    • Accurate inspired oxygen monitoring is vital for patient safety in anesthetic procedures.