Which of the following is the PRIMARY structural change in the lungs of a patient with emphysema?

Question

Accepted Answer

B. Destruction of alveolar walls with loss of elastic recoil. ## Emphysema: Pathological Definition

**Key Point:** Emphysema is defined as permanent enlargement of airspaces distal to the terminal bronchiole, accompanied by destruction of alveolar walls and loss of elastic recoil.

### Structural Changes in Emphysema

| Feature | Emphysema | Chronic Bronchitis |
|---------|-----------|-------------------|
| **Primary lesion** | Alveolar wall destruction | Bronchial inflammation & mucus gland hyperplasia |
| **Elastic recoil** | Markedly decreased | Preserved initially |
| **Airway obstruction** | Loss of radial traction | Mucus plugging & smooth muscle hypertrophy |
| **Pathology type** | Obstructive | Obstructive |

### Pathological Mechanism

1. **Oxidative stress** → imbalance of protease-antiprotease system
2. **Neutrophil elastase** and **matrix metalloproteinases** → destruction of elastic fibres and alveolar walls
3. **Loss of elastic recoil** → airway collapse during expiration (air trapping)
4. **Emphysematous spaces** → reduced gas exchange surface area

**High-Yield:** The hallmark finding is **alveolar wall destruction**, NOT bronchial changes (which define chronic bronchitis). This is the single most important distinguishing feature on histology.

**Clinical Pearl:** Patients with pure emphysema present as "pink puffers" (barrel chest, pursed-lip breathing, preserved oxygenation initially) due to increased work of breathing and preserved gas exchange until late disease.

[cite:Robbins 10e Ch 15]

Answer

A. Thickening of bronchial smooth muscle and mucus gland hyperplasia

Answer

C. Fibrosis and architectural distortion of lung parenchyma

Answer

D. Accumulation of anthracotic pigment in alveolar macrophages

Which of the following is the PRIMARY structural change in the lungs of a patient with emphysema?

Explanation

Emphysema: Pathological Definition

Structural Changes in Emphysema

Pathological Mechanism

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Feature	Emphysema	Chronic Bronchitis
Primary lesion	Alveolar wall destruction	Bronchial inflammation & mucus gland hyperplasia
Elastic recoil	Markedly decreased	Preserved initially
Airway obstruction	Loss of radial traction	Mucus plugging & smooth muscle hypertrophy
Pathology type	Obstructive	Obstructive