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Related Experiment Videos

Oxygen concentrations received from commonly used delivery systems.

J S Redding, D D McAfee, C W Gross

    Southern Medical Journal
    |February 1, 1978
    PubMed
    Summary

    Supplemental oxygen delivery devices were tested for accuracy. Venturi devices were accurate at 40% oxygen or less, while non-Venturi devices showed variable and inaccurate oxygen concentrations.

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    Area of Science:

    • Respiratory Medicine
    • Biomedical Engineering
    • Pulmonary Physiology

    Background:

    • Supplemental oxygen is crucial for spontaneously breathing patients.
    • Accurate delivery of precise oxygen concentrations is vital for patient care.
    • Existing oxygen delivery devices vary in their ability to provide consistent concentrations.

    Purpose of the Study:

    • To determine the mean inhaled oxygen concentrations delivered by five common supplemental oxygen devices.
    • To assess the accuracy and variability of oxygen concentrations provided by these devices.
    • To identify factors influencing the accuracy of oxygen delivery.

    Main Methods:

    • Inhaled oxygen concentrations were indirectly determined by plotting arterial oxygen tensions against known concentrations in volunteers.

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  • Fitted equations derived from volunteer data were used to calculate delivered oxygen concentrations from each device.
  • Peak inspiratory flow rates of volunteers were measured and compared to device gas flows.

    • Main Results:

    • Venturi principle devices accurately delivered set oxygen concentrations at settings of 40% or less.
    • Above 40%, Venturi devices and all non-Venturi devices delivered variable and inaccurate oxygen concentrations.
    • Inaccuracy and variability were linked to patient's peak inspiratory flow rates exceeding device gas flow.

    Conclusions:

    • Oxygen delivery devices employing the Venturi principle are reliable for concentrations up to 40%.
    • Higher concentrations from Venturi devices and all concentrations from non-Venturi devices are unreliable for spontaneously breathing patients.
    • Device performance is significantly affected by patient inspiratory demand exceeding gas flow delivery.