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PHYSIOLOGIC AND QUANTITATIVE COMPUTED TOMOGRAPHY DIFFERENCES BETWEEN CENTRILOBULAR AND PANLOBULAR EMPHYSEMA IN COPD.

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Panlobular emphysema (PLE) may indicate advanced COPD and can occur in early stages, differing from centrilobular emphysema (CLE). This study used CT analysis to differentiate these emphysema types in smokers.

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Area of Science:

  • Pulmonary Medicine
  • Radiology
  • Respiratory Diseases

Background:

  • Chronic Obstructive Pulmonary Disease (COPD) encompasses various phenotypes.
  • Centrilobular emphysema (CLE) and panlobular emphysema (PLE) are distinct emphysema types.
  • Differentiating these phenotypes is crucial for understanding disease progression.

Purpose of the Study:

  • To define the differences between CLE and PLE phenotypes in cigarette smokers with COPD.
  • To utilize a combined qualitative-quantitative computed tomography (CT) analysis for phenotype distinction.
  • To correlate CT-derived metrics with clinical parameters and smoking history.

Main Methods:

  • Chest CT scans from 116 smokers were analyzed.
  • Radiologists and pulmonologists visually scored emphysema phenotypes (CLE vs. PLE).
  • Automated CT quantification assessed emphysema (LAA ≤ -950 HU), gas trapping, and bronchial metrics (%WAsegm, %WAsubsegm).

Main Results:

  • PLE was observed in 38.2% of GOLD stages 1 and 2, and more frequent in GOLD stages 3 and 4.
  • PLE correlated positively with %LAAinsp-950 and negatively with smoking pack-years.
  • Bronchial wall measures (%WAsegm, %WAsubsegm) showed stronger association with FEV1% in CLE than in PLE.

Conclusions:

  • PLE may represent a more advanced stage of emphysema.
  • PLE can occur in earlier stages of COPD.
  • Emphysema phenotypes exhibit different interactions with airway disease.