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Related Experiment Videos

A general purpose microprocessor for spirometry

K H Black, M L Petusevsky, E A Gaensler

    Chest
    |October 1, 1980
    PubMed
    Summary
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    This study introduces a portable microprocessor for accurate spirometry, analyzing forced vital capacity (FVC) and maximal voluntary ventilation (MVV). The device offers reliable on-line analysis for clinical use.

    Area of Science:

    • Pulmonary Function Testing
    • Medical Device Engineering
    • Respiratory Diagnostics

    Background:

    • Spirometry is crucial for diagnosing respiratory diseases.
    • Existing spirometry systems can be expensive and not easily portable.
    • Standardized analysis algorithms are essential for reliable results.

    Purpose of the Study:

    • To develop and validate a portable, inexpensive microprocessor for on-line spirometry.
    • To implement Snowbird Conference recommendations for accurate pulmonary function analysis.
    • To assess the device's performance against established calibration methods.

    Main Methods:

    • Utilized a microprocessor for real-time analysis of FVC, its derivatives, and MVV.
    • Implemented digital differentiation and algorithms for test interpretation.

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  • Validated the system using a Stead-Wells spirometer, pneumotachograph, turbinometer, and FVC simulator.
  • Conducted patient testing with 168 individuals.

    • Main Results:

    • Achieved high accuracy with resolution of +/- 0.02 L and minimal differences (<0.04 L) compared to tracing analysis.
    • Demonstrated excellent correlation (r = .999) for MVV measurements.
    • Showed comparable results to calibration devices in patient testing.
    • Standard deviations were within +/- 0.04 L or L/sec for most parameters.

    Conclusions:

    • The portable microprocessor provides accurate and reliable on-line spirometric analysis.
    • It meets the criteria for clinical application, offering cost-effectiveness and portability.
    • The device facilitates standardized interpretation of pulmonary function tests.