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nbme24/Block 2/Question#19 (31.5 difficulty score)
A 70-year-old man comes to the physician ...
Alveolar-arterial Po 2 differenceπŸ”
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 +10 
submitted by neonem(570),
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hsTi tpetain sah urplaymno ibssofri, icwhh uacses a cvitrierste ot(n posctre-ty)ebuvit sie.aesd eScin hrete asw no iouccalnapot preu,sxeo m'I niumagss tshi si atdhpiiioc lnyarupmo i.srbosfi Tshi suecsa ckehidetn lraleoav bems,mraen itmlinig sga fofsundi.i oTreehfre, yutelnleav O2 wt'no be bael ot fedufsi uclyiqk hguone iton eht olbdo carsos hte -taleiovarrralael nmrm,beea genuitlsr in a rlgare -Aa fendifecr.e (I ihtkn tres'eh mlyranlo a lmals a-A inad,tger frmo 4-12 mm Hg, btu nhwe ihst steg too ,igb uoy teg yo)hcpxi

yex  UW q id 7648 +2  
melanoma  uw id 1526 +1  
feeeeeever  FA 2019 Pg. 661 +1  



 +4 
submitted by madojo(176),
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hTe enswar si ton B buacees hwit aitineslirtt oirissfb you ahve a eracdsee ni eth gsfunidfi cyciapta seecaub of hte tdehnckie vloaeral bnm.emera hTe ensrwa si ton RFC eceaubs htat lwil rseeedac ni a vrisitcrete ugln siesdea cshu as iosf.ibrs ,FCV VR, dna VT rea lal deectpxe ot c.eedrsae




 +1 
submitted by graciewacie9(7),

I chose residual volume, but looking back, here's why its not (correct me if im wrong):

Restrictive lung disease is an issue with inspiring enough O2, not a problem with expiration (which is in obstructive lung disease like emphysema from floppy alveoli)

Also, a factor that influences A-a gradient is thickened membranes (decreased ability to diffuse across)

I think "Alveolar-arteriole PO2 difference" threw me off bc they didnt use the exact term of A-a gradient and I wasnt able to deduce that they're the same thing or felt like i was being tricked




 +0 
submitted by graciewacie9(7),

I chose residual volume, but looking back, here's why its not (correct me if im wrong):

Restrictive lung disease is an issue with inspiring enough O2, not a problem with expiration (which is in obstructive lung disease like emphysema from floppy alveoli)

Also, a factor that influences A-a gradient is thickened membranes (decreased ability to diffuse across)

I think "Alveolar-arteriole PO2 difference" threw me off bc they didnt use the exact term of A-a gradient and I wasnt able to deduce that they're the same thing or felt like i was being tricked




 -2 
submitted by therealslimshady(26),

Weird wording on the last sentence "Which of the following pulmonary function tests in this patient will most likely show a result greater than the predicted range?"

I mean, I was like this guy definitely has pulmonary fibrosis, so I'm predicting that his range of FVC, RV, FRC, TV, etc is low. It would be nice if it said 'greater than a normal patient'