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Centrilobular and panlobular emphysema in smokers. Two distinct morphologic and functional entities
W D Kim1, D H Eidelman, J L Izquierdo
1Respiratory Division of the Royal Victoria Hospital, Montreal, Quebec, Canada.
The American Review of Respiratory Disease
|December 1, 1991
Summary
Centrilobular emphysema (CLE) shows uneven lung destruction and small airway abnormalities, leading to reduced lung compliance. Panlobular emphysema (PLE) is more homogeneous, with elasticity correlating to FEV1/FVC.
Area of Science:
- Pulmonary Medicine
- Respiratory Physiology
- Pathology
Background:
- Emphysema is characterized by lung destruction, but morphologic patterns may influence mechanical properties.
- Understanding these differences is crucial for diagnosing and managing emphysema.
Purpose of the Study:
- To investigate the hypothesis that distinct morphologic patterns of emphysema correspond to different lung mechanical properties.
- To compare centrilobular emphysema (CLE) and panlobular emphysema (PLE) in terms of lung structure and mechanics.
Main Methods:
- Pulmonary function tests and lung mechanics were measured in 34 subjects with diagnosed emphysema.
- Microscopic criteria were used to classify emphysema as pure/predominant CLE (n=18) or PLE (n=16).
- Morphologic features including mean linear intercept (Lm), coefficient of variation (CV) of interalveolar wall distance, and small airway abnormalities (SAD) were assessed.
Main Results:
- CLE exhibited a significantly higher CV, indicating uneven destruction, and greater SAD compared to PLE.
- CLE showed significantly lower static compliance, specific compliance, and exponential constant (K) than PLE.
- FEV1/FVC correlated with SAD in CLE, while it correlated with elasticity (K) in PLE.
Conclusions:
- Morphologic patterns of emphysema significantly impact lung mechanics.
- CLE is associated with heterogeneous destruction, small airway disease, and reduced lung compliance.
- PLE is characterized by more homogeneous destruction, with elasticity influencing airflow limitation (FEV1/FVC).