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Related Experiment Videos

Temperature corrections in routine spirometry.

D Cramer, A Peacock, D Denison

    Thorax
    |October 1, 1984
    PubMed
    Summary
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    Temperature affects spirometer accuracy. Converting readings to body temperature and pressure saturated (BTPS) improves rolling seal spirometer results but can introduce errors with Vitalograph devices due to bellows compliance changes.

    Area of Science:

    • Pulmonary Function Testing
    • Respiratory Physiology
    • Medical Device Engineering

    Background:

    • Accurate measurement of lung function is crucial for diagnosing and monitoring respiratory diseases.
    • Spirometers are standard tools, but their accuracy can be influenced by environmental factors like temperature.
    • Different spirometer types may exhibit varying sensitivities to temperature-induced measurement errors.

    Purpose of the Study:

    • To evaluate the impact of ambient temperature on spirometry measurements using two different spirometer types.
    • To assess the validity of the ambient temperature, and pressure saturated (ATPS) to body temperature, and pressure saturated (BTPS) conversion across varying temperatures.
    • To investigate the underlying mechanism for observed discrepancies in spirometer performance.

    Main Methods:

    Related Experiment Videos

    • Forced expiratory volume (FEV1) and forced vital capacity (FVC) were measured in nine healthy subjects.
    • Measurements were taken using three Vitalograph and three rolling seal spirometers at 4°C, 22°C, and 32°C.
    • Spirometer bellows compliance was measured at the different temperatures to explain performance variations.

    Main Results:

    • Converting rolling seal spirometer data to BTPS improved measurement agreement across temperatures.
    • Converting Vitalograph data to BTPS introduced errors up to 13% at extreme temperatures.
    • Vitalograph bellows compliance increased at higher temperatures and decreased at lower temperatures compared to room temperature.

    Conclusions:

    • The ATPS-BTPS conversion is valid and necessary for rolling seal spirometers across different temperatures.
    • Applying ATPS-BTPS conversion to Vitalograph measurements outside normal room temperature can introduce significant errors.
    • Changes in Vitalograph bellows compliance with temperature explain the observed measurement discrepancies.