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Retired NBME 24 Answers

nbme24/Block 1/Question#9 (reveal difficulty score)
The graph shows expiratory pressure-volume ...
Diffuse pulmonary fibrosis ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +10  upvote downvote
submitted by โˆ—jus2234(23)
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The graph shows a decrease in compliance of the lungs. Of the options, diffuse pulmonary fibrosis is the only choice that is an example of a restrictive lung disease which would decrease compliance

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nor16  asthma = emphysema = chronic bronchitits, obstructive. leaves 2 out of 5... +7
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. +16

Other potential causes of decreased lung compliance are pneumonia (doesn't make sense here for reasons given by usmile1 in subcomments), NRDS, and pulmonary edema. FA2019 p. 651.

+5/- baja_blast(219)


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submitted by โˆ—andro(269)
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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)

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