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NBME 17 Answers

nbme17/Block 2/Question#39 (9.9 difficulty score)
A 40-year-old man with interstitial pulmonary ...
Increased radial traction on airwaysπŸ”
tags: Respiratory 

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 +5 
submitted by baja_blast(91),

Fibrosis pulls the airway open, increasing radial traction and decreasing resistance to airflow.

Here is a picture comparing fibrosis (increased traction) to emphysema (decreased traction) to a healthy lung.