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Chest Wall Kinematics Using Triangular Cosserat Point Elements in Healthy and Neuromuscular Subjects.

Dana Solav1,2, Henri Meric3,4,5, M B Rubin6

  • 1Faculty of Mechanical Engineering, Technion Israel Institute of Technology, 32000, Haifa, Israel. danask@mit.edu.

Annals of Biomedical Engineering
|April 29, 2017
PubMed
Summary

A new method using triangular Cosserat point elements (TCPEs) enhances optoelectronic plethysmography (OEP) analysis of chest wall movement. This TCPE approach detects subtle, localized chest wall motion, improving clinical evaluation, especially in neuromuscular patients.

Keywords:
Breathing patternChest wall kinematicsNeuromuscular disorderOptoelectronic plethysmographyRespiratory motion

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Respiratory Physiology

Background:

  • Optoelectronic plethysmography (OEP) noninvasively measures chest wall (CW) motion for lung volume assessment.
  • Current OEP analysis primarily focuses on global volume changes, potentially missing localized kinematic information.

Purpose of the Study:

  • To introduce and validate a novel method for analyzing local CW kinematics using triangular Cosserat point elements (TCPEs) from OEP data.
  • To assess the added value of TCPE analysis compared to traditional volume-based methods in healthy and patient populations.

Main Methods:

  • A mesh of 78 triangles was created on the anterior CW using 52 markers, with each triangle represented by a TCPE.
  • TCPE kinematics were described by four time-variant parameters, and CW volume contributions of six compartments were estimated.
  • The method was validated in healthy subjects and patients with Pompe disease and Duchenne muscular dystrophy (DMD) during spontaneous breathing (SB) and vital capacity (VC) maneuvers.

Main Results:

  • TCPE outward translation parameters correlated well with compartmental volumes in healthy subjects.
  • In neuromuscular patients, TCPE analysis identified local asynchronous and paradoxical CW movements not discernible by volume changes alone.
  • Phase angles (SB) and correlation coefficients (VC) demonstrated the enhanced sensitivity of the TCPE method.

Conclusions:

  • The TCPE approach provides a more detailed analysis of local CW kinematics than traditional OEP volume measurements.
  • This method offers additional, valuable information for the clinical evaluation of respiratory mechanics, particularly in patients with neuromuscular disorders.
  • TCPE analysis has the potential to enhance the diagnostic capabilities of OEP in clinical settings.