A 38-Year-Old Man Comes to the Office with Reports of Dyspnea

A 38-year-old man comes to the office with reports of dyspnea on exertion and decreased exercise tolerance.  His medical history is unremarkable, and he has no history of childhood asthma or cough.  He has never smoked and has no known occupational exposures.  The patient has gained almost 100 lb over the past 4 years since leaving the military due to a sedentary lifestyle.  He currently weighs 135 kg (297.6 lb) and has a BMI of 41 kg/m².  His respiratory rate is 22/min and pulse oximetry is 93% on room air at rest.  Physical examination is notable for central obesity.  Lungs are clear on auscultation bilaterally.  Which of the following changes (forced expiratory volume in 1 second [FEV₁], forced vital capacity [FVC], expiratory reserve volume [ERV], residual volume [RV], and total lung capacity [TLC]) are most likely to be seen on pulmonary function testing in this patient?

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

Correct Answer:

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