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NBME 21 Answers
A 40-year-old man with interstitial pulmonary ...
Increased radial traction on airways
I think this is it
-pulmonary fibrosis increases elastic recoiland widens airway 2/2 increased outward force (radial traction) by fibrotic tissue thus decreasing airflow resistance thus supernormal expiratory flow rates (higher than nl following correction for lung volume)
The fibrosis causes contraction, the airways are pulled open giving less resistance to airflow