Morphometric alveolar parameters by study group
| COPD (n=23) | Smokers (n=20) | Non-smokers (n=20) | p Value | |
|---|---|---|---|---|
| Alveolar diameter, µm | 322.4±45.8 | 282.2±42.2 | 267.8±54 | 0.002 |
| Alveolar elastic fibre thickness, µm | 12.7±2.2 | 13.6±3.3 | 12±2.0 | 0.293 |
| Extra-alveolar vessel diameter, µm | 91.1±16.1 | 102.1±22.5 | 102.1±26.7 | 0.077 |
| ABI ratio, median (IQR) | 0.85 (0.64–1.61) | 1.2 (0.62–2.1) | 0.78 (0.52–1.04) | 0.164 |
ABI, alveolar/bronchial wall fluorescence intensity.