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Airway occlusion pressure

W A Whitelaw1, J P Derenne

  • 1Department of Medicine, University of Calgary, Alberta, Canada.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1993
PubMed
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Airway occlusion pressure measures respiratory muscle output, independent of lung mechanics. While useful in clinical settings, interpreting results requires careful consideration of limitations and potential signal distortions.

Area of Science:

  • Respiratory Physiology
  • Neuromuscular Control

Background:

  • Airway occlusion pressure has been utilized for two decades to assess respiratory controller output.
  • This measurement reflects the combined effect of respiratory muscles, unaffected by respiratory system resistance or compliance.

Purpose of the Study:

  • To evaluate the utility and limitations of airway occlusion pressure in assessing respiratory neuromuscular output.
  • To highlight factors influencing the accuracy of this measurement.

Main Methods:

  • Analysis of airway occlusion pressure during respiratory cycles in anesthetized subjects or animals.
  • Consideration of pressure changes at 0.1 seconds into inspiration (P0.1) in conscious subjects.

Main Results:

  • The original assumption of isometric occlusion pressure has been disproven; factors like lung volume and chest wall distortions affect readings.

Related Experiment Videos

  • Brief occlusions (P0.1) are useful but require caution due to potential signal damping and phase lags.
  • Changes in P0.1 may reflect waveform alterations rather than true output changes.

    • Conclusions:

    • Airway occlusion pressure is a valuable, simple technique for clinical investigations when its limitations are understood.
    • Accurate interpretation necessitates accounting for physiological variables and potential measurement artifacts.