On pulmonary function testing,which of the following lung abnormalities is/are common in patients with severe cystic fibrosis?
I.Obstructive pattern
II.Restrictive pattern
III.Airway hyperreactivity
IV.Normal pattern when asymptomatic

Question

Quizplus · Accepted Answer

Pulmonary function testing initially demonstrates air flow obstruction.As the disease progresses,both a restrictive and an obstructive pattern can be seen,along with a decrease in air flow.About 50% of patients with CF have a positive methacholine challenge test,which indicates airway hyperreactivity.

On Pulmonary Function Testing,which of the Following Lung Abnormalities Is/are