Which respiratory condition can lead to respiratory acidosis?

• A. Asthma
• B. Chronic obstructive pulmonary disease (COPD)
• C. Pneumonia
• D. Lung cancer

Answer: (B)

Chronic obstructive pulmonary disease (COPD) is a condition characterized by long-term airflow limitation that is not fully reversible. This limitation is typically due to a combination of emphysema and chronic bronchitis, both of which can significantly impair the lungs' ability to exchange gases efficiently. In COPD, the obstruction of airflow can result in inadequate ventilation, leading to the retention of carbon dioxide (CO2) in the bloodstream. As CO2 levels rise, it combines with water to form carbonic acid, lowering the pH of the blood and resulting in respiratory acidosis.

This condition is particularly prevalent in individuals who have a history of smoking or exposure to irritants. By contrast, while asthma, pneumonia, and lung cancer can also impact respiratory function, they do not consistently lead to the same degree of carbon dioxide retention and resultant acidosis as seen in COPD. Asthma can lead to acute exacerbations but does not typically result in chronic respiratory acidosis unless associated with severe and prolonged attacks; pneumonia can cause a range of acid-base imbalances, but its primary impact may not be as consistently linked to respiratory acidosis in the same way as COPD; and lung cancer may cause respiratory issues but the mechanism is not directly tied to CO2 retention