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Related Experiment Videos

BTPS correction with dynamic spirometers.

G Forche, K Harnoncourt, E Stadlober

    Respiration; International Review of Thoracic Diseases
    |January 1, 1986
    PubMed
    Summary
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    Expired air temperature decreases significantly during spirometry, necessitating correction to Body Temperature and Pressure Saturated (BTPS) values. Room temperature is sufficient for accurate clinical measurements using dynamic spirometers.

    Area of Science:

    • Pulmonary Function Testing
    • Respiratory Physiology

    Background:

    • Dynamic spirometers measure expired air volume.
    • Accurate pulmonary function testing requires temperature correction.

    Purpose of the Study:

    • To determine temperature correction requirements for expired volumes.
    • To assess temperature changes in spirometer bellows.

    Main Methods:

    • Measured expired air temperature in spirometer bellows.
    • Used a Vitalograph dynamic spirometer.
    • Conducted measurements at 24°C and 12.2°C ambient temperatures.

    Main Results:

    • Significant temperature decrease observed during forced expiration.
    • Temperature decrease showed a linear relationship with ambient temperature.

    Related Experiment Videos

  • Temperature differences up to 12-15% occurred within seconds.

    • Conclusions:

    • Expired air volume values (FEV1, FVC) from bellows spirometers require BTPS correction.
    • Room temperature is adequate for routine clinical spirometry correction.
    • No correlation found between temperature decrease and expiratory volume magnitude.