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In situ methods for assessing alveolar mechanics
1Department of Chemistry, Chemical Biology and Biomedical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|November 15, 2011
Summary
Confocal microscopy of rat lungs reveals that common imaging methods do not artifactually alter lung mechanics during ventilation. This finding ensures accurate study of lung function and disease.
Area of Science:
- Pulmonary Physiology
- Biomedical Imaging
- Respiratory Mechanics
Background:
- Lung mechanics are crucial for understanding lung function and disease.
- Previous light microscopy studies advanced lung mechanics research but may have introduced artifacts.
- Accurate imaging techniques are needed to reliably study the intact lung.
Purpose of the Study:
- To evaluate potential artifacts introduced by common microscopy methodologies on lung mechanics.
- To assess the impact of different imaging conditions on alveolar field dimensions and inflation-induced expansion.
- To validate a water immersion objective technique for unconstrained lung surface imaging.
Main Methods:
- Confocal imaging of fluorescently labeled rat lung alveoli using a water immersion objective.
- Comparison of imaging with different setups: unconstrained, O-ring/coverslip, O-ring/coverslip/vacuum, and without perfusion.
- Ventilation of isolated, perfused rat lungs and imaging at endpoints to assess dimensional changes.
Main Results:
- A coverslip minimally enlarged the alveolar field; vacuum pressure had no additional effect.
- Absence of perfusion did not alter alveolar field dimensions.
- Inflation-induced expansion of the alveolar field was consistent across all tested methodologies.
Conclusions:
- The employed microscopy methods, including the water immersion objective, do not significantly artifact lung mechanics.
- These findings support the reliability of confocal imaging for studying lung mechanics in intact lungs.
- The validated methodology allows for accurate assessment of lung function and response to ventilation.
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