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Original article
Structure–function relationship in COPD revisited: an in vivo microscopy view
  1. Borja G Cosío1,2,
  2. Hanaa Shafiek1,3,
  3. Federico Fiorentino1,
  4. Cristina Gómez4,
  5. Meritxell López1,
  6. Angel Rios1,
  7. Ana Kersul1,
  8. Bernardo Togores1,
  9. Joan Palmer5,
  10. Jaume Sauleda1,2,
  11. Alvar Agustí2,6
  1. 1Department of Respiratory Medicine, Hospital Universitario Son Espases and Instituto de Investigación Sanitaria de Palma (IdISPa), Palma de Mallorca, Spain
  2. 2Ciber de Enfermedades Respiratorias (Ciberes), Bunyola, Spain
  3. 3Faculty of Medicine, Chest Diseases Department, Alexandria University, Alexandria, Egypt
  4. 4Department of Pathology, Hospital Universitario Son Espases, Palma de Mallorca, Spain
  5. 5Department of Radiology, Hospital Universitario Son Espases, Palma de Mallorca, Spain
  6. 6Thorax Institute, Hospital Clinic, IDIBAPS, Univ Barcelona and FISIB, Barcelona, Spain
  1. Correspondence to Dr Borja G Cosio, Department of Respiratory Medicine, Hospital Universitario Son Espases. Ctra. Valldemossa 79, Palma de Mallorca 07010, Spain; borja.cosio{at}ssib.es

Abstract

Background Fibred confocal fluorescence microscopy (FCFM) is a novel technology that allows the in vivo assessment and quantification during bronchoscopy of the bronchial wall elastic fibre pattern, alveolar and vessel diameters and thickness of the elastic fibre in the alveolar wall.

Aims To relate these structural characteristics with lung function parameters in healthy subjects, smokers with normal spirometry and patients with chronic obstructive pulmonary disease (COPD).

Methods We performed FCFM in 20 never smokers, 20 smokers with normal spirometry and 23 patients with COPD who required bronchoscopy for clinical reasons. The bronchial wall elastic fibre pattern was classified as lamellar, loose and mixed pattern, and later confirmed pathologically. Airspace dimensions and extra-alveolar vessel diameters were measured. Lung function measurements and pulmonary CT scans were obtained in all participants.

Results Patients with COPD were characterised by a significantly higher prevalence of loose fibre bronchial deposition pattern and larger alveolar diameter which correlated inversely with several lung function parameters (forced expiratory volume in 1 s (FEV1) , FEV1/forced vital capacity ratio, maximum expiratory flow, carbon monoxide transfer factor and carbon monoxide transfer coefficient; p<0.05). Increased alveolar macrophages were demonstrated in active smokers with or without COPD.

Conclusions This is the first FCFM study to describe in vivo microscopic changes in the airways and alveoli of patients with COPD that are related to lung function impairment. These findings open the possibility of assessing the in vivo effects of therapeutic interventions for COPD in future studies.

  • Emphysema
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