Which finding is most characteristic of an acute COPD exacerbation?

• A. Fever without dyspnea
• B. Hypotension
• C. Increased dyspnea
• D. Absence of sputum production

Answer: (C)

Acute COPD exacerbation is defined by an acute worsening of respiratory symptoms, with increased work of breathing reflecting more obstruction and gas exchange problems. The most characteristic finding is a noticeable rise in dyspnea—the patient feels breathless beyond their baseline and has to work harder to breathe. This change drives the need for more rapid or shallow breathing, use of accessory muscles, and often wheezing.

Fever without dyspnea is not typical of an isolated COPD flare (fever points more toward infection with systemic signs). Hypotension is not a hallmark feature of COPD exacerbation and would raise concern for other processes or complications. Absence of sputum production contradicts the typical pattern, since exacerbations usually involve increased sputum production, and sometimes purulent sputum if infection is present.

So the key idea is that sudden, increased dyspnea is the most characteristic sign signaling an acute COPD exacerbation.