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Related Experiment Videos

A rapid-response u.v. halothane meter.

M L Tatnall, P G West, P Morris

    British Journal of Anaesthesia
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new breath-by-breath halothane monitor using ultraviolet light absorption. The innovative design provides accurate, real-time measurements for safe anesthesia monitoring in adults and children.

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    Area of Science:

    • Anesthesiology
    • Medical Instrumentation
    • Analytical Chemistry

    Background:

    • Accurate monitoring of anesthetic agents like halothane is crucial for patient safety during surgery.
    • Existing methods may have limitations in real-time accuracy or breath-by-breath analysis.

    Purpose of the Study:

    • To describe the design and performance of a novel instrument for monitoring halothane concentrations.
    • To enable accurate, instantaneous, breath-by-breath measurement of halothane during anesthesia.

    Main Methods:

    • The instrument utilizes ultraviolet (UV) light absorption principles.
    • A unique design allows the entire exhaled breath to pass through the sample cell for continuous analysis.
    • Stabilized power supplies, solid-state circuitry, and filtering ensure instrument stability and selectivity.

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  • A valve mechanism prevents rebreathing of UV-exposed gas.

    • Main Results:

    • The monitor provides accurate and instantaneous breath-by-breath halothane concentration measurements.
    • Digital displays for inspired and end-tidal concentrations are available, along with an analog output.
    • Negligible zero and gain drift were observed after an initial settling period.
    • No detectable interference from other respiratory gases was found.

    Conclusions:

    • The developed halothane monitor is stable, selective, and highly accurate.
    • Its capability for real-time, breath-by-breath monitoring makes it suitable for pediatric and adult anesthesia.