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Related Experiment Videos

Standard flow-time waveforms for testing of PEF meters

J L Hankinson1, R O Crapo

  • 1National Institute for Occupational Safety and Health, Division of Respiratory Disease Studies, Morgantown, WV 26505, USA.

American Journal of Respiratory and Critical Care Medicine
|August 1, 1995
PubMed
Summary

New flow-time waveforms improve peak expiratory flow (PEF) meter testing. Standard spirometer tests do not adequately assess PEF meters, leading to potential inaccuracies. These new waveforms offer a more precise evaluation method.

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Area of Science:

  • Pulmonary Function Testing
  • Biomedical Engineering

Background:

  • The American Thoracic Society (ATS) recommends volume-time waveforms for spirometer testing.
  • Current ATS waveforms, though including peak expiratory flow (PEF) values, were not designed for PEF meter evaluation.
  • Existing methods using ATS waveform 24 lack the necessary flow-time waveform variety (rise times) for comprehensive PEF meter assessment.

Purpose of the Study:

  • To develop and validate a new set of flow-time waveforms specifically designed for evaluating peak expiratory flow (PEF) meters.
  • To establish a more accurate method for measuring PEF and related flow parameters like rise time and time to PEF.

Main Methods:

  • Developed a set of 26 specific flow-time waveforms for PEF meter evaluation.
  • Directly measured PEF from the new flow-time curves.

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  • Compared PEF measurements derived directly from flow-time curves against PEF indirectly derived from ATS volume-time curves using the recommended algorithm.

    • Main Results:

    • A significant difference (up to 10.7%) was observed in PEF measurements between direct flow-time curve analysis and indirect volume-time curve analysis for waveforms with fast rise times.
    • Minimal differences in PEF derivation methods were noted for waveforms with slower rise times.
    • The 26 flow-time waveforms provide a standardized method for testing PEF meter software and hardware.

    Conclusions:

    • The developed set of 26 flow-time waveforms provides a superior method for testing peak expiratory flow (PEF) meters compared to existing ATS volume-time waveforms.
    • Accurate PEF measurement requires waveforms that capture a range of rise times, particularly for fast-rising flows.
    • These waveforms are crucial for the reliable testing of PEF meters and associated software algorithms.