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NBME 22 Answers

nbme22/Block 1/Question#33 (28.9 difficulty score)
A 32-year-old woman begins to hyperventilate ...
Cerebral blood flowπŸ”

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submitted by keycompany(308),
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iprteylvHnoenita ecdeesra aP2O.C Ctnearl peerrctohmecos enrdosp ot wlo CaOP2 yb tgrnovtncaisiosc ealrbrec bldoo .seslsve

)A lAeirrat oolBd genxyO ttonnCcnoriea: oBdlo Oxeyng acCotirnonent si rcitdley elratde to bH icrotcateonnn dan sotnruaati S(2Oa) 902,F1A p. 653. aVi hte rBoh Etceff, aseddecer CaP2O will cseanrei O,S2a suht nasreigcni olbod yngxoe etrtinancoocn.

B) liraAert ldoBo P2O: 2aPO cshagne ni erpnsoes ot deseedarc ,POA2 OIP2, ro siiufd.onf Three dlwuo eb no eaghnc ni OPa2 nirgud elaeovytniphirtn y.rl(a)ietcheotl

C) Aetrial urressPe: eceradsDe PaOC2 is ociaatsdse twhi ciovoaicntr,sston ichwh wdluo aeesnrci dolob rssup.ere

E) Carebelr ssueiT Hp lwuod ancseier ued ot itepryasror ailsoa.skl

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

submitted by seagull(1539),
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oasgavalV Sp.yneco uchM raeies

submitted by usmleboy(10),

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.