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Airway Remodeling in Cystic Fibrosis Is Heterogeneous.

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Airway remodeling in cystic fibrosis (CF) is diverse, with bronchiectasis severity not predicting lung function. Small airway disease is crucial in advanced CF, regardless of visible airway changes.

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Pathology

Background:

  • Cystic fibrosis (CF) is known for bronchiectasis and obstructive impairment.
  • Small airway remodeling's role in CF, particularly its link to bronchiectasis, is not well understood.

Purpose of the Study:

  • To morphometrically analyze large and small airway disease in advanced CF using detailed imaging and histology.
  • To investigate the relationship between airway remodeling and functional impairment in CF.

Main Methods:

  • Utilized ex vivo high-resolution computed tomography (HRCT) and micro-computed tomography (μCT) on explanted CF and control lungs.
  • Performed morphometric analysis of airway volume, airway segmentation, distal airway diameter, and airway collapse.
  • Supplemented imaging with histological analysis of distal airway collapse.

Main Results:

  • Airway volume percentage (AV%) on HRCT showed overlap between CF and control lungs, indicating heterogeneous bronchiectasis.
  • Micro-CT revealed homogeneous small airway loss in CF lungs (generations 9-16).
  • AV% did not correlate with lung function (FEV1) or open distal airways; however, open distal airways correlated with lung function. Collapsed distal airways showed dilation and constrictive bronchiolitis on histology.

Conclusions:

  • Airway remodeling in end-stage CF is heterogeneous, with varying degrees of bronchiectasis and small airway dilation.
  • Bronchiectasis severity does not correlate with functional impairment or the extent of small airway loss.
  • Small airway disease plays a significant role in advanced CF, independent of visible bronchiectasis.