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Retired NBME 20 Answers

nbme20/Block 1/Question#37 (reveal difficulty score)
A 1-month-old male newborn is brought to the ...
Na+: 132; K+: 3.2; Clโˆ’: 90; HCO3โˆ’: 37 ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +8  upvote downvote
submitted by apop(8)
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sheeT plaiaxsenotn eatnr etg.ra It odestn lleayr vhea uhcm to od hwit RSAA iacio.tnvta It hsa osmlat tveernhyig ot do wtih a ehenonnpom laeldc the alenialk i.dte nI ornichc ngtvmtii,o uyo ludwo ectepx C-l ot eb olw adn =K to eb wlo ri(mlsai ot abl srlutse ni nosemoe hwti lilu.)mabe To tspmeaneoc ofr eht owl -l,C eht ohtacsm ahs an etrtnrpoai hhiwc gexchnsea C-l for HCO-3. fore,rThee -Cl ilwl be deseerhipln in the mtcoha,s wilhe 3CO-H wlli nircseae ni eht lo,bod saignuc na s.oaklasli In liloaakct etasst, eht /HK++ oretinrapt lwli bigne ot ,ecviaatt fiitgnhs +K NIOT lscel y)liakaehom(p nad esiincagnr p.H SARA baborylp yalps a erlo in mgakin eth iealpyokmah oewsr utb het lakleina tdie si omre nmttpirao eehr.

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spaceboy98  Itsn nlaiekla etid tedaerl to na eseicnar ni pH retfa sleam? Yuro locig is no npito but m'I nto eurs hwereht ew anc ppyal taht cntpeco h.ere +1
kevin  opncect nac eb epadpil eehr uebsace ew deen ot ptleere the l-C in order to ctraee lH;C the sthacmo ostdne' cera fi -lC is olw in ,rmues lnyo hatt -Cl si wol in eth ailtrpae clsel dan so llwi pump tuo OHC-3 in ist xpsneee +
usmleaspirer  yhw is +K ?low +


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 +6  upvote downvote
submitted by โˆ—hayayah(1212)
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ihtW rncochi imti,ogvn you leso seeyrteolltc dna a lto of i.dca tI rgegstir bemcatiol aloisskal wchhi si hwy lla teh rmsue alsuev ear lwo or( no eht orlew den of het maronl aenrg) eepcxt fro abotnirc.bea

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ergogenic22  rcedsdeea K+ omr(f esinradce SARA due ot moulev sl)os dan cadsderee C-l lso(s of HCl mrof hte )scto,ahm Alikalsos ofmr lsso of CHl adn sthu gihh ia.rr cbboF itsh eoansr hihg ot imd gnare K is rnogw +5
sbryant6  uWotn'dl incasedre RASA elad ot sendarice ?+Na The nasrwe hsows secardede N+.a +3
sbryant6  ,loAs embmrree ulBimia resovNa si adcsoeista hiwt hmayoekla.ip +1
sugaplum  so het gnear yeht evag fro K si ?3-6 so 2.3 si WLN hnte? ro aer ew jtus gpiartone no i"t is no eht eowrl edn fo nrmlao ni pdse" +2
dbg  idmuos evells in pioycrl nossiset r,vay oginhtn lrayle si,clasc acn be ihhg sa in hist seac yplmsi edu ot id,nyrthao nca lwo in othre escas if oatodneselr daenagm to eersvre atth to teh terho reetmex +1
skonys  cpic,ryhomoeH"l aplmoehkyic liabetcmo iaslolask si eth cclissa lclyreetteo nda sbacde-ia cblmaanie fo oriplcy isoss"ten fmor pmseaced eibdhn mwolitVnay .apilg = mlvueo ossl cde( ksin grut)o sa lwel as osls of H,+ lC- nda it(a+hNw )H20 g-&;t cboiltaeM sAloalk.si ssoL of +H cussae eiecrsan 3O-CH nettorein as wlle as K+ tifhs tino csell lmkhyaapoei( F91A )875. +

From amboss: The loss of gastric hydrochloric acid from emesis results in increased bicarbonate concentration in the blood and decreased chloride. Some potassium is also lost through vomiting. Hypovolemia leads to an activation of RAAS, which exacerbates metabolic alkalosis via increased bicarbonate reabsorption (as a result of angiotensin II). Aldosterone also causes renal secretion of potassium and hydrogen ions, further exacerbating both hypochloremia and metabolic alkalosis.

+10/- smpate(20)

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 +5  upvote downvote
submitted by โˆ—masonkingcobra(408)
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In tiaoecmbl aossi,llka mssptoiua esovm tion teh cesll

hTe sslo in oemvlu hthuogr iesmse ristgger SRAA lgetnuris in secieardn trdonAseole aereels dna huretrf satumpsoi ncoetxrei

/t/wet.ttipeen1wsap1d6hbl:.w//ta

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 +3  upvote downvote
submitted by iamapotato(3)
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oN oen eerh robhdtee to ltaulyca csiusds 'wshta ngiog oTs.hn i is a m1-hont odl rw.obnne

eH vimsto freta igf,sneed -a5dy oiys.thr

At 1 tomhn l,do ihwt mtivgnio tfare ni,edgesf ti si smot liklye a acse of RCOYPIL NIESTOSS due to hpypotyrerh of eht oilcryp tnpcrhesi yuaulls( urscoc 6 keesw e)l.rat

Due to him ioimgnvt sctoahm sotcnten, he will SEOL Cl,- +K, adn +.Na

eH lwil SLOA sleo +H. iTsh si hwy uyo go tion hte mbtalcieo okaslsial iwht a untrtasel neeirasc in het HO.-3C

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kamilia20  htyc:s:ek iogvtnmi usaecs slos fo ETAWR rtgreea tahn osmduโ†’i reeancdsi emurs โ†’udimos AEESDCRIN srume a,yioslmtlo So NA ilwl csareede too, btu on taht far +


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 +1  upvote downvote
submitted by ark110(1)
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tuB twha si eht cedrenffei eewnebt intopo A nad oitopn C (21;3 9.;4 ;90 )35

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sympathetikey  K+ sohtl'ndu nsiarc.ee 'Its mginvo otin eclsl due ot licmaobte los.sikala +
home_run_ball  nI hte itlraepa elcl fo eht erco d an Htsy hmog onis rae eodrfm rmfo eht iiasntodicso of coricbna ai.dc treaW is a evyr irnom cosrue of hrengyod nsoi in msoprnacoi to ibcracon .dica oacCbinr dcia is dmeorf from cnbora odixied nad arwet yb cnacrboi T.r eah nysdhae neaioatrbbc noi C3H)(โˆ’O si negcexdah for a rolecidh oin )l(Cโˆ’ no the asabl sied of teh lelc and teh rcatoibaben esffiusd into teh oneusv o,obld lgneaid to an laaleink deti onopnhne.em +1
ergogenic22  AARS sraenesic rmof emouvl ,ossl nda tuhs remo nrloedasteo laesd ot wol K+ +1
sinforslide  Trhee arnsose for kmlpaoi.yhae F r,sti emos K+ si lsot in strigac fdlsui. oS,n dc e H+ fhssit otu of lcsel nad K+ hssfti onti slcel ni tilaebomc li. ka,aodsisl rhT EFC volemu ncooitnacrt sah dsuaec nescderai eoncrtise of olders.etoan +3


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 +1  upvote downvote
submitted by โˆ—rainlad(33)
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coolr,yciphmHe imyachloekp lmcbteaio kllaisosa is the isalcsc otclerteyel adn -ibascead mienlacba of cyroilp snio.tses

tetniPessr gvtomnii rstusle in ossl fo .lCH The loihdrec ossl lrusset ni a low bodlo clorehdi velel cwihh isiprma het id'yesnk iaytlib ot reeexct cbaetrniboa. Tish is the catfro hatt preesvnt tnroicecor of teh allaosski dgineal to actmoelib .ssaoklail

A oscdaenyr ltrmpsreeyadihonos vdeeospl ued ot het ddreeseca lbood uvm.elo The ghhi snoaeedoltr velsel ausecs hte diyeksn to earint a+N (to cceortr the alarnraiuscvt elmovu ,ioetndpl)e dna cexeert insacered osamtun of K+ ntio hte eunri g(lruenist ni a owl oldob elelv fo m.)ssautipo

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 +0  upvote downvote
submitted by thefoggymist(12)
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I otnd' tge s.iht t'lunSdoh eht skydein attsr neotrigrcc eht baircb esllev fera 5 a?yds heT eddlyae aeshp of hte otniocrcer iscne etyh tkae ...time dan in eht nosiutqe te'yhre kniasg e."wnWo " veah tcmoiable kalaossil secni LCH si ,ltso os eht dybo iwll ryt ot ccrroet ti tsfir by etyvnliirnhatepo and ralet by ndieearsc etxiorenc of arcbb.i cbarBi huosld eb ..owl. s(uesnl 'mI smsinig tmneihsog due ot eignb )axshtuede

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thefoggymist  mv,eendrNi I think I got t.i taeB areadtelicnt sllce atcnon uconitnf nad rteceex caribb beeacus ew not'd hvea odhlr.eic eYa lppnarayet I swa tea.eusdxh +


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submitted by โˆ—amirmullick3(76)
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Vrey eays suietq.on uinisoolNb imv.ot 1 mnhot eag. tMso lyekli eioasncr is oryiclp s.tisoesn

Teh tvnmioig uesacs sosl of ClH os we have eht yrio,helpaochm nad rlnae mtpnieosanoc rfo hits H olss i ysb grvsinpeer potrnso at teh xnepese fo K so htat seigv .iykalohepma As het asidees si e,nadm hte oredr war ni eth migae fo hte msaocht is somoth muelsc prhoryhptey fo het rolpyic sulaimrucs suoecm,a ti grmohefn eveo-pahidls smsa etlf no iolt.nppaa hsiT si a elbtociam askslalio abeecus owthiut l-C, het etClHaCsro/Oa3l abl cexrengha lilw nto rwok, os uoy eirnat HC.O3

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