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Regional lung tissue changes with mechanical ventilation and fluid load.

Cristiana Marcozzi1, Andrea Moriondo, Eleonora Solari

  • 11Department of Surgical and Morphological Sciences, University of Insubria, Varese, Italy.

Experimental Lung Research
|April 7, 2015
PubMed
Summary

Mechanical ventilation and fluid overload can damage healthy lungs, particularly in ventral regions. These interventions degrade lung extracellular matrix, leading to structural changes and fragmentation.

Keywords:
hydrodynamic tissue stresslung extracellular matrixmechanical tissue stresspulmonary interstitiumregional lung injury

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Extracellular Matrix Biology

Background:

  • Mechanical ventilation is crucial for respiratory support but can induce lung injury.
  • The extracellular matrix (ECM) plays a vital role in lung structure and function.
  • Understanding the regional effects of ventilation and fluid overload on lung ECM is essential for optimizing patient care.

Purpose of the Study:

  • To investigate the gravity-dependent impact of mechanical ventilation and fluid overload on lung ECM in healthy lungs.
  • To assess how different tidal volumes (V(T)) and positive end-expiratory pressure (PEEP) affect lung ECM.
  • To determine the influence of fluid overload on lung ECM composition and structure.

Main Methods:

  • Healthy rats were mechanically ventilated for 4 hours under various conditions: low/high V(T) with/without PEEP, and with/without intravenous saline infusion.
  • Glycosaminoglycans (GAGs) composition of ventral and dorsal lung parenchyma was analyzed.
  • Structural changes in lung ECM, including alveolar septa thinning and GAGs disorganization, were evaluated.

Main Results:

  • Mechanical ventilation degraded lung ECM, causing alveolar septa thinning and GAGs disorganization.
  • Low V(T) affected both ventral and dorsal lung regions, while high V(T) primarily impacted dependent regions.
  • PEEP mitigated ECM injury in ventral regions, but high V(T) still caused matrix fragmentation.
  • Fluid overload exacerbated lung damage, particularly in ventral regions.

Conclusions:

  • Mechanical ventilation and fluid load can cause additive injuries to healthy lungs.
  • These injuries predominantly affect the ventral lung regions.
  • Findings highlight the importance of considering regional gravity-dependent effects during mechanical ventilation and fluid management.