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Alveolar Microdynamics during Tidal Ventilation in Live Animals Imaged by SPring‐8 Synchrotron
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Alveolar Microdynamics during Tidal Ventilation in Live Animals Imaged by SPring‐8 Synchrotron
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Journal Article
Alveolar Microdynamics during Tidal Ventilation in Live Animals Imaged by SPring‐8 Synchrotron
2024
Overview
It is self‐evident that our chests expand and contract during breathing but, surprisingly, exactly how individual alveoli change shape over the respiratory cycle is still a matter of debate. Some argue that all the alveoli expand and contract rhythmically. Others claim that the lung volume change is due to groups of alveoli collapsing and reopening during ventilation. Although this question might seem to be an insignificant detail for healthy individuals, it might be a matter of life and death for patients with compromised lungs. Past analyses were based on static post‐mortem preparations primarily due to technological limitations, and therefore, by definition, incapable of providing dynamic information. In contrast, this study provides the first comprehensive dynamic data on how the shape of the alveoli changes, and, further, provides valuable insights into the optimal lung volume for efficient gas exchange. It is concluded that alveolar micro‐dynamics is nonlinear; and at medium lung volume, alveoli expand more than the ducts. Gas exchange is enhanced when the alveolar volume increases more than the alveolar duct's volume because an increase in alveolar volume increases the surface area available for gas exchange but the ducts do not directly contribute to gas exchange. This study reveals that more air enters the alveolus than the alveolar ducts, showing the highest alveolar wall compliance, in the case of medium lung volume.
Publisher
John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
Subject
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