A 67-year-old woman has pulmonary function tests performed to evaluate symptoms of dyspnea. The most prominent finding is a reduction of the ratio of FEV1/FVC. Which of the following is the most likely diagnosis?
The VC is reduced in emphysema, but the FEV1 is grossly reduced because of high airway resistance. In predominant emphysema, diffusing capacity is more profoundly decreased than in predominant bronchitis.
COPD
ankylosing spondylitis
Pickwickian syndrome
scleroderma of the chest wall
Respiratory