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Potential errors in measuring the phase difference between chest flow and mouth flow

M Mishima1, K Kawakami, N Sugiura

  • 1Department of Clinical Physiology, Kyoto University, Japan.

Frontiers of Medical and Biological Engineering : the International Journal of the Japan Society of Medical Electronics and Biological Engineering
|January 1, 1993
PubMed
Summary

The phase difference between chest and mouth airflow measurements is a reliable indicator for obstructive lung disease. Computer simulations confirm that factors like airway resistance and gas volume do not hinder its clinical application.

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Area of Science:

  • Respiratory Physiology
  • Pulmonary Medicine
  • Biomedical Engineering

Background:

  • The phase difference between chest (Vc) and mouth (Vm) airflow measurements has been identified as a valuable indicator for obstructive lung diseases.
  • Understanding factors influencing this measurement is crucial for its reliable clinical application.

Purpose of the Study:

  • To evaluate the impact of various physiological and physical factors on the phase difference between chest and mouth airflow.
  • To determine if these factors impede the clinical utility of this measurement in diagnosing obstructive lung disorders.

Main Methods:

  • Computer simulations were employed to calculate the effects of specific parameters on the phase difference.
  • Parameters investigated included airway reactance, extrathoracic airway shunt impedance, inspired air conditioning, abdominal gas volume, and respiratory quotient.

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Main Results:

  • The phase difference calculated with simple airway resistance (theta r) differed minimally (0.8%) from that including airway inertance and shunt compliance (theta s) in normal lungs.
  • Increased peripheral resistance caused theta s to exceed theta r, but by no more than 5%.
  • Extrathoracic airway shunt impedance, heating/humidification, and abdominal gas volume effects were within acceptable limits (≤5% or ≤0.1%).

Conclusions:

  • None of the investigated factors (airway impedance, extrathoracic effects, inspired air conditioning, abdominal gas, respiratory quotient) pose a significant obstacle to the clinical application of the chest-mouth airflow phase difference.
  • This method remains a viable tool for evaluating pathological changes in obstructive airway disorders.