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Related Experiment Videos

Spirometry: what paper speed?

R M Gardner, R O Crapo, R G Billings

    Chest
    |August 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Accurate spirometry measurements require a minimum paper speed of 3 cm/sec. This helps reduce errors in forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) assessments.

    Area of Science:

    • Pulmonary Function Testing
    • Respiratory Mechanics
    • Medical Device Calibration

    Background:

    • Accurate spirometry is crucial for diagnosing and managing respiratory diseases.
    • The optimal paper speed for manual measurement of spirometry tracings remains debated.
    • Potential for significant measurement errors exists with suboptimal recording speeds.

    Purpose of the Study:

    • To determine the impact of paper speed on the accuracy of spirometric measurements.
    • To identify the minimum paper speed required for reliable forced vital capacity (FVC) analysis.
    • To assess the frequency and nature of errors made during manual spirometry interpretation.

    Main Methods:

    • Twenty-four computer-generated spirometric waveforms with known characteristics were used.

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  • Waveforms were plotted at paper speeds of 1, 2, and 3 cm/sec.
  • Twelve experienced readers manually measured the waveforms in a randomized order.

    • Main Results:

    • A high incidence of major measurement errors was observed across all readers.
    • Paper speed significantly influenced the accuracy of forced expiratory volume in one second (FEV1) and mid-forced expiratory flow measurements.
    • A minimum paper speed of 3 cm/sec was found to be essential for accurate manual measurements.

    Conclusions:

    • Manual measurement of spirometry is prone to significant errors, particularly at lower paper speeds.
    • A minimum paper speed of 3 cm/sec is recommended for reliable hand-held spirometry measurements.
    • Minimizing human error can be achieved through multiple curve readings, duplicate measurements, and validated computerized systems.