Which description best matches emphysema?

Which description best matches emphysema?

• A. Chronic Bronchitis
• B. Emphysema
• C. Asthma
• D. Pneumonia

Answer: (B)

Emphysema is defined by irreversible destruction of the walls of the alveoli with loss of elastic recoil, which reduces the surface area for gas exchange and makes expiration ineffective. This air trapping leads to hyperinflation of the lungs, a characteristic barrel-shaped chest, and breathlessness that is out of proportion to sputum production. On exam you often find diminished breath sounds and a prolonged expiratory phase, reflecting the difficulty exhaling air. The diffusion capacity for carbon monoxide is decreased because the alveolar walls and capillary beds are damaged. This pattern distinguishes it from chronic bronchitis (productive cough with mucus), asthma (reversible airway narrowing), and pneumonia (infection with alveolar consolidation).

Emphysema is defined by irreversible destruction of the walls of the alveoli with loss of elastic recoil, which reduces the surface area for gas exchange and makes expiration ineffective. This air trapping leads to hyperinflation of the lungs, a characteristic barrel-shaped chest, and breathlessness that is out of proportion to sputum production. On exam you often find diminished breath sounds and a prolonged expiratory phase, reflecting the difficulty exhaling air. The diffusion capacity for carbon monoxide is decreased because the alveolar walls and capillary beds are damaged. This pattern distinguishes it from chronic bronchitis (productive cough with mucus), asthma (reversible airway narrowing), and pneumonia (infection with alveolar consolidation).