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A simple dosimeter for bronchial provocation testing using a solid-state electronic timing module.

D B Thomson, T L Clanton

    Respiratory Care
    |November 6, 1986
    PubMed
    Summary
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    Researchers developed a low-cost electronic device for precise, intermittent methacholine inhalational challenge tests. This reliable system ensures accurate airway responsiveness measurements, making advanced testing more accessible.

    Area of Science:

    • Pulmonary Medicine
    • Medical Device Engineering

    Background:

    • Airway hyperresponsiveness testing is crucial for diagnosing respiratory conditions.
    • Commercial methacholine dosimeters are expensive, limiting accessibility.
    • Intermittent aerosol delivery ensures precise dosing during challenge tests.

    Purpose of the Study:

    • To develop a cost-effective, reliable electronic dosimeter for methacholine inhalational challenge tests.
    • To enable reproducible and precise timing of aerosolized medication delivery.

    Main Methods:

    • Constructed an electronically controlled dosimeter using readily available components ($100 cost).
    • Integrated the device with a DeVilbiss Model 646 nebulizer.
    • Validated the system's ability to trigger nebulizer puffs within 0.5 seconds of inspiratory onset.

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    Main Results:

    • The custom-built dosimeter provides reproducible and precise timing of challenge puffs.
    • The system proved to be satisfactory and reliable in over a year of use.
    • The device's low cost significantly reduces the expense of airway responsiveness testing.

    Conclusions:

    • A low-cost, DIY electronic dosimeter offers a reliable and precise alternative for methacholine challenge tests.
    • This innovation enhances the accessibility of accurate airway responsiveness assessments.
    • The developed system is easily calibrated and operated by experienced technicians.