Chronic Obstructive Pulmonary Disease: An Overview of Pathology and Pathogenesis
Bibliographic record
Abstract
A cigarette smoke-induced inflammatory process underlies the pathogenesis of the majority of pathologic lesions associated with chronic obstructive pulmonary disease (COPD). In chronic bronchitis, this process is located in the mucosa, gland ducts and glands of intermediate sized bronchi with an internal diameter of 2-4 mm. The mucus-containing exudate produced by the inflammatory response overpowers the normal clearance mechanisms, resulting in the cough and expectoration that characterize chronic bronchitis. In some cases of chronic bronchitis, the inflammatory process extends to smaller bronchi and bronchioles less than 2 mm in internal diameter. In this location, the inflammatory process thickens the wall, narrows the lumen and destroys the parenchymal support of the airways. These changes progressively increase peripheral airways resistance and eventually reduce the patient's ability to empty their lungs to a degree that can be measured by a reduction in FEV1 (forced expiratory volume in one second). The reduction in lung surface area produced by parenchymal inflammation contributes to the decline in FEV1 by reducing lung elastic recoil, which is the major force driving air out of the lung. It also contributes to the reduction in diffusing capacity by reducing the lung capillary bed. The purpose of this presentation is to review the quantitative aspects of these pathological changes and attempt to provide insight into factors which result in progression of these lesions.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.000 |
| Bibliometrics | 0.003 | 0.003 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".