A 64-Year-Old Man Is Examined Because His Dyspnea Becomes Worse

A 64-year-old man is examined because his dyspnea becomes worse with exercise. He's smoked 40 packs in the past 40 years. On percussion, the lungs are hyperresonant, and on auscultation, there is generalized wheezing. On a chest x-ray, the diaphragm is flattened, the mediastinum is thin, and the peripheral lung region has fewer bronchovascular signs. Which of the following trends for lung volume in this patient is more likely? (Each bar represents total lung capacity with different volumes as marked.)

A) A
B) B
C) C
D) D

Correct Answer:

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