invite friends ⋅ share via emailtwitter
support the site ⋅ become a member ⋅ unscramble the egg
free120  nbme24  nbme23  nbme22  nbme21  nbme20  nbme19  nbme18  nbme17  nbme16  nbme15  nbme13 

NBME 20 Answers

nbme20/Block 4/Question#15 (37.8 difficulty score)
A 45-year-old man is undergoing a surgical ...
Decreasing respiratory rate🔍

Login to comment/vote.

 +7  upvote downvote
submitted by radion(15),
unscramble the site ⋅ become a member ($36/month)

raeicrpyabH cesuas ceaerbrl i.aoioasvntld If oyu veah rvee seen an -iratn ro ueact stpopo- sunrcoigearlu tn,aitep or lrlyea any ineatpt aubto ot ,aetenrhi uoy acn reebmmer itsh cebause eyth wlli eb eeirethvldntypa ot 2pOC roudna 5320- to sdreaece PIC via rebrcael aotcts;onroiscvni ni hits sae,c ew ehva eth ops.teopi heT rvecu of O2Cp vs breclaer oodlb lofw is qitue setep in eth hislpogicoy regan imnaneg lsaml ascnhge in iotitnevlan ekma a afinisnticg nrfeifceed in FBC.

smc213  FA 2018 p.486 +3  
lynn  2019 - pg 489 +3  
jaeyphf  2020 - pg 501 +2  

 +1  upvote downvote
submitted by drdoom(645),
unscramble the site ⋅ become a member ($36/month)

eTh reom nrgaeel :crneilipp ohntaediel sivdaetlao ni the enspreec of hghi ;C2O yuo oatgt gte rdi fo ttah idca ehmwo!os n’atC tel ti eaau,uctlcm as wlore pH whniit a n”trnromce-“vnimieo sfcetfa tcufect/rrcuyesifien of ese,nmyz otri,snpe tce. eTh meor iiccda a alcol nonetrmei,nv eth remo oyu etcxep ernyab aetcluavusr to edaitl sa( a maens fo caigiensnr olwf ta,er ebyerht yeignrfr off ceuacamtlu .)daci

hTe egeishaoinsotlts nca oxipelt this m.isaencmh By irnvttyeahineglp b(wgonil fof 2)OC, teh brnia usaalcetruv nessse a wlo O2C / y-rkdyhnuo“ s,ta”te ichwh errsuqei no .oatiilaosvdn In toehr ors,wd eth ecrsutulava deos ont ndee to tnicnoue eth TgmPonnAcui-s tpericca fo hensigsyzitn ricNti edxiO O).N(

hello  But, the Q-stem states the anesthesiologist is HYPOventilating the patient. +4  
drdoom  decreasing respiratory rate = retention of CO2 = vasodilation of brain arteries = more filling of tubes = greater intra-cranial pressure +1  
drdoom  @hello shoot, you're right! i ended my explanation with the example of HYPERventilation when i should have done the opposite! (sorry!) ... edit: "By HYPOventilating (retaining CO2), the brain vasculature senses a high CO2 environment and vasodilates = increases intra-cranial filling and pressure!" +3  
dulxy071  @drdoom could you please elaborate on your point. +  

 +1  upvote downvote
submitted by hayayah(989),
unscramble the site ⋅ become a member ($36/month)

Htloepnaevtiyrni euascs eeedsacdr 2CaPO chiwh nusqtubeleys lsdea to iaatrrel stcnoisarcvoiont hstu lnoiwgre eerbclar doolb flow ,BF(C) arleecrb dolob uelvo,m and .ICP

eH tnwsa ot eesrnica CIP ecr(balre )otvdiolainsa ihhwc eh nca od yb cisdeargne eht rspetiroyra tare haiio)o(nv.lyneptt

unscramble the site ⋅ become a member ($36/month)

lutCnd'o uyo soal adreecse het ?2OFI ePr AF, CPP lsao ancerseis to ixophya alos easdreecs CPP ehnw OP2 t;l& 05 mmHg.

cienfuegos  Obviously not the BEST option in this scenario, but seems like it could work unless I'm missing something. +1  
step1soon  Its primariy driven by PCO2! only when O2 levels drop <50 mmhg is when the body responds to low O2 pressures +1