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Assessing thoracoabdominal asynchrony.

A M Black1, R K Millard

  • 1Department of Anaesthetics, University of Bristol, Bristol, UK. Department of Medical Physics, United Bristol Healthcare Trust, Bristol, UK.

Clinical Physiology (Oxford, England)
|May 31, 2001
PubMed
Summary

Cross-correlation analysis offers a statistically superior method for assessing breathing asynchrony compared to traditional Lissajous plots. This approach enhances respiratory monitoring accuracy for conditions like Cheyne-Stokes breathing.

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To the editor: re: Brown KA, Platt R, and Bates JHT, "Automated analysis of paradoxical ribcage motion during sleep in infants," Pediatr Pulmonol 2002;33:38-46.

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Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology
  • Signal Processing

Background:

  • Traditional Lissajous plots for ribcage-abdomen phase difference are inadequate for assessing breathing asynchrony.
  • Accurate respiratory monitoring is crucial for patients with conditions like obstructive apnoea and Cheyne-Stokes breathing.

Purpose of the Study:

  • To introduce and evaluate advanced signal processing techniques for improved respiratory monitoring.
  • To assess the degree of asynchrony between ribcage and abdominal breathing movements.
  • To explore uncalibrated, non-invasive methods for respiratory monitoring.

Main Methods:

  • Signal processing technique of cross-correlation was employed.
  • Analysis of Lissajous figure's latent structure to derive movement sum and difference components.

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  • Application to postoperative monitoring of Cheyne-Stokes breathing with obstructive apnoea.

    • Main Results:

    • Cross-correlation provides a statistically based and improved assessment of breathing asynchrony.
    • Movement sum and difference components offer a more general analysis of relative tidal volume changes.
    • Proposed methods demonstrate preference over traditional inductive plethysmography calibrations.

    Conclusions:

    • Cross-correlation and Lissajous figure analysis offer superior methods for non-invasive respiratory monitoring.
    • These techniques are valuable for tracking asynchrony and tidal volume changes in complex breathing patterns.
    • Uncalibrated monitoring methods are preferable research tools due to plethysmography limitations.