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NBME 24 Answers

nbme24/Block 1/Question#9 (16.5 difficulty score)
The graph shows expiratory pressure-volume ...
Diffuse pulmonary fibrosis🔍

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 +8  upvote downvote
submitted by jus2234(16),
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The agprh oswhs a seeercda ni apncmceoli of hte fO het t,ipnoos ufiesfd omanuyprl riiobssf si eth lyno eicohc atth is na xpelmae fo a ctvreiriset nlug eidsaes ihhwc dwulo reesaedc cacielmnpo

nor16  asthma = emphysema = chronic bronchitits, obstructive. leaves 2 out of 5... +2  
usmile1  Common causes of decreased lung compliance are pulmonary fibrosis, pneumonia and pulmonary edema. So yes pneumonia could possibly cause the decreased compliance shown, but the vignette says the patient has "9 month history of progressive SOB." That couldn't reasonably be pneumonia, leaving diffuse pulmonary fibrosis as the best answer. +4  

 +0  upvote downvote
submitted by andro(116),

Recall : Formula for compliance Change in volume / Change in pressure

From the patients graph - a large change in pressure is required to bring about a change in volume , signalling decreased compliance * Restrictive lung disease ( intrinsic)