Question

a nursing student understands that emphysema is directly related to which of the following?
hypercapnia resulting from decreased carbon dioxide tension
respiratory acidosis from airway obstruction
diminished alveolar surface area
hypoxemia secondary to impaired oxygen diffusion

Explanation:

1. Analyze Option 1: Hypercapnia is increased carbon dioxide tension, so "decreased carbon dioxide tension" is incorrect.
2. Analyze Option 2: Emphysema's direct issue is alveolar damage, not primarily airway obstruction - related respiratory acidosis (airway obstruction is more COPD - bronchitis).
3. Analyze Option 3: Emphysema involves destruction of alveoli, which reduces the alveolar surface area (this is a direct pathological change in emphysema as alveoli lose their structure, merge, etc., reducing the area for gas exchange).
4. Analyze Option 4: Hypoxemia in emphysema is more due to ventilation - perfusion mismatch rather than impaired oxygen diffusion (diffusion issue is more in fibrosis, etc.).

Answer:

C. Diminished alveolar surface area