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Related Concept Videos

Forced Oscillations01:06

Forced Oscillations

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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
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Comparison of oscillometry devices using active mechanical test loads.

Ronald J Dandurand1,2, Jean-Pierre Lavoie3, Larry C Lands1

  • 1Oscillometry Unit, Centre for Innovative Medicine and Meakins-Christie Laboratories of the Research Institute of the McGill University Health Centre, McGill University, Montreal, QC, Canada.

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|December 31, 2019
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Summary

Oscillometry devices show significant variability in measuring lung function, impacting accuracy. Standardized testing and harmonization are crucial for reliable respiratory resistance and reactance measurements.

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Area of Science:

  • Pulmonary Physiology
  • Medical Device Engineering

Background:

  • Oscillometry is favored for noninvasive lung function assessment.
  • Concerns exist regarding the comparability of different oscillometry devices.

Purpose of the Study:

  • To compare the performance of six oscillometry devices.
  • To evaluate device accuracy with mechanical test loads under simulated breathing conditions.

Main Methods:

  • Tested five commercial and one custom oscillometer.
  • Used mechanical loads (resistors, compliances, inertance) mimicking respiratory impedance.
  • Simulated breathing at varying tidal volumes and frequencies.

Main Results:

  • Devices showed deviations in respiratory resistance (Rrs) and reactance (Xrs) measurements.
  • Mean Rrs was acceptable, but frequency-dependent Rrs and Xrs showed significant errors in some devices.
  • Errors affected calculations of compliance (C), inertance (L), resonance frequency (fres), reactance area (A), and resistance change (R5-20(19)).
  • Simulated breathing had minimal impact on results.

Conclusions:

  • Significant device-dependent variability exists in oscillometry measurements.
  • Calibration, mouthpiece corrections, and signal processing may contribute to discrepancies.
  • Rigorous testing and harmonization are needed to improve oscillometry's clinical utility.