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NBME 22 Answers

nbme22/Block 1/Question#33 (24.9 difficulty score)
A 32-year-old woman begins to hyperventilate ...
Cerebral blood flow🔍

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 +14  upvote downvote
submitted by keycompany(264),
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B) lteiraAr looBd 2PO: Oa2P cshaeng in soesrnep ot cresdeaed 2OA,P P2O,I ro o.ififusdn hrTee udowl eb on nahecg in OP2a udrign apthynieoirvteln ah)(roy.cltieetl

)C Araetil ssrueerP: dseecaeDr 2OPaC si iadsteoasc thiw ssnit,iocrotanovc hwchi luwdo iarcsnee dloob erpesrsu.

E) beraelCr eiTsus pH ludow rcenasei due ot aorretsiryp .laosksial

keycompany  EDIT: Via the **Haldane Effect**, not the Bohr Effect. +  
impostersyndromel1000  excellent response +  
teepot123  fa 19 pg 489 +  

 +2  upvote downvote
submitted by seagull(1080),
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aoglasvaV eopcSy.n uchM sareei

 +0  upvote downvote
submitted by usmleboy(7),

One thing that always helps me remember this concept is that in the patients post brain surgery, we often HYPERventilate their vent to decrease ICP (I.E. decrease cerebral blood flow).

This is due to lower PaCO2 in the blood, and resultant vasoconstriction of the cerebral vessels.