All of the following pulmonary function findings would be expected in a patient with moderate to severe cystic fibrosis EXCEPT:


a. increased FVC.
b. increased RV.
c. decreased PEFR.
d. decreased FEF50%.


Because of the obstructive lung problems associated with cystic fibrosis, the FVC will be decreased, not increased. Obstruction will lead to all expiratory flows being low. Air trapping will cause the RV to be increased.


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