An older adult patient presents with a 10-year history of chronic cough and sputum production, particularly in the mornings. She has smoked 1 pack of cigarettes daily for 45 years but quit last year. Spirometry indicates a post-bronchodilator FEV1/FVC ratio of 0.65. Which of the following pathophysiological processes is most directly responsible for the excessive mucus production observed in this condition?
Group of answer choices
- Accumulation of inflammatory cells in the alveoli
- Thickening of the arterial walls in the pulmonary circulation
- Decreased cilia function in the bronchi
- Hyperplasia of the mucus-secreting glands in the bronchioles
The correct answer is Hyperplasia of the mucus-secreting glands in the bronchioles.
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Explanation:
This patient’s presentation is consistent with chronic bronchitis, a subtype of chronic obstructive pulmonary disease (COPD), which is commonly associated with a long history of smoking. The primary pathophysiological process responsible for excessive mucus production in chronic bronchitis is hyperplasia of the mucus-secreting glands in the bronchioles. This leads to increased mucus production and often results in the chronic cough and sputum production characteristic of the condition.
Here’s a breakdown of the answer choices:
- Accumulation of inflammatory cells in the alveoli: This is more characteristic of emphysema, another type of COPD, where inflammatory cells damage the alveoli, but it’s not the primary mechanism for mucus overproduction in chronic bronchitis.
- Thickening of the arterial walls in the pulmonary circulation: This refers to pulmonary hypertension, which can develop as a complication of chronic obstructive pulmonary diseases like chronic bronchitis or emphysema, but it’s not directly responsible for excessive mucus production.
- Decreased cilia function in the bronchi: Although cilia dysfunction occurs in COPD, which impairs the clearance of mucus, the primary cause of excessive mucus production is hyperplasia of the mucus-secreting glands, not simply the loss of cilia function.
- Hyperplasia of the mucus-secreting glands in the bronchioles: This is the correct answer, as it directly causes the excessive mucus production seen in chronic bronchitis, which is a hallmark of the condition.
Therefore, the excessive mucus production seen in this patient is due to hyperplasia of the mucus-secreting glands in the bronchioles.
