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Parenchymal stability.

D Stamenović1, T A Wilson

  • 1Department of Biomedical Engineering, Boston University, Massachusetts 02215.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1992
PubMed
Summary
This summary is machine-generated.

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Lung mechanics models reveal stability: homogeneous lungs are stable, but non-uniform surface-to-volume ratios can cause regional lung collapse, especially with high surface tension.

Area of Science:

  • Pulmonary Mechanics
  • Biophysics
  • Computational Biology

Background:

  • Continuum and micromechanical models are used to study lung parenchyma mechanics.
  • Discrepancies exist in conclusions regarding lung stability based on different modeling approaches.

Purpose of the Study:

  • To reconcile findings from continuum and micromechanical models of lung parenchyma stability.
  • To investigate the conditions leading to regional lung collapse.

Main Methods:

  • Augmenting a continuum model with elastic moduli bounds from micromechanical modeling.
  • Developing a micromechanical model to illustrate regional collapse.

Main Results:

  • The combined continuum and micromechanical approach yields stability conclusions consistent with purely micromechanical models.

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  • Homogeneous lungs are predicted to be stable under positive transpulmonary pressure.
  • Non-uniform surface-to-volume ratios can lead to collapse in regions with higher surface density, particularly when surface tension is high and insensitive to surface area.

    • Conclusions:

    • Lung stability is dependent on regional variations in surface-to-volume ratio.
    • High surface tension can drive regional collapse in non-uniform lung structures.
    • Micromechanical modeling provides insights into localized lung tissue behavior.