NBME 23 Precapillary resistance (NBME Answers)

Retired NBME 23 Answers

nbme23/Block 4/Question#45 (reveal difficulty score)
A 32-year-old man has a diastolic blood ...
Precapillary resistance 🔍 / 📺 / 🌳 / 📖
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submitted by ∗ferrero(48)

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A ryve isliamr ioesqtnu I vhea nese in bsankQ illw ksa why a paetint hwti itghr ehart filearu osde nto edovepl eemda nad eth wearsn si rnesacdei chympatli geardn.ia I ogt ihts esnqutoi rnwog ioynrgalli eesbuac I nsewarde agnol sith einl fo gnsroaien ubt I khnit in sthi asce it all sha ot do wthi EWREH the atxre prseesru si conmig morf. In shit oieuntsq the tp sha oclsaitid terhenposyin so ouy acn htkin butao het erpsusre as icmong dofr"wra" os ogiinttsrncc eprlaclrpaiy rtcspeihns nac vrnteep an eiansecr ni rsprseue ni the aylaiprlc .deb Howvree fro gthir ehart raeulfi tish aextr lfdiu si onmigc romf the SPPOTOIE iotcrdnie kawrbasd(c morf eth htgir htae)r nad tsogirccitnn crrpyeailpal ithcrspnse nca do tiongnh (on ioesppto dsie of calprilay b)ed - eth lyon ywa to pteenrv deame si ot iascenre ymclihpat r.egnaaid

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seagull heT qstenuoi clerayl dela us to nitkh tbaou iOscotm suerpsre yb kntialg tabuo ntpeoir nad ni.eur I wdoren ohw ynma eppole duse ahtt enli fo geanonsri eik(l lf)yme?s +20

mousie teaGr eaxotin,apnl I sheco hmilpayct iaandger orf teh mesa gianersno (lsmarii Q on itedfnerf k)nab +9

sympathetikey My enosrigna swa hmcu oerm tcmslpsiii mybae( oto ipslm)e tbu ni my inm,d lcysosit PB is entiddeerm by diracaC ttuuOp nad clditaois BP si ereddnmite yb roiee.trlsa forTeeeh,r waht mscoe brfoee eth plriaalyc and atluersge ctsenra?esi eolsrA.tire h'Tast hyw I iasd hatt lypaa-cplreri entceasr.is +41

cr the naim rnideecffe tneeewb teh 2 assec si tath ni ihst asce teh ietpnat ash hihg PB +1

link981 So in rtnaeinkgred eagganlu het eutonqis si yiseenaltls insagk hwo ihhg sprusree in eht aierlrat esstym is OTN asdtnttrmei to eht eovusn tsmesy hwhi(c si heerw EDEAM lp)deosev. uBt oyu wnok yeht ehav ot dda lla hsit nfoi ot yrt senofuc a icbsa peilicpnr adn amke uyo nceosd usesg l.fyuorse t(oG it gwonr by eth y)aw saueecb fo whta @orrfere adis fo Qbkna sunios.qet +9

hello @errfroe whta era uoy nagklti au?tob tlyciamph ieadnagr si het rogwn awnsre... +1

hello ko rvene .mndi i ogt .it rdah ot tdnedsuanr c/b it asw a ibg bkclo of x.tet +2

asteroides I hnitk thye aym eb tnaiglk obuat eth mnyeogic sntecmooapyr icnema:msh h=5ttbr/nbwt.we1K/?/g/4oocjclil3f.hoonpNooy54/wBeust.gnibv.gnpr/imf.4i/sker:ecs"dr neIa traeairl ro nsveou essrrpeu osal incdesu nimcyego tciisnonotrc of eeosiraltr dan liyrcparlaep ptneshisrc, chhiw areiss raelorirta eirsctsaen ybrtehe( niignimizm het cneaesri ni aapliyclr urees)psr nad ceuresd eth racmaoiucrslv ceursaf eraa llbaveaai orf uldif egoF.ecn hrax p,eelxam bsuecea vlcrasau htmsoo euscml in tliraare adn aolrreatri slalw totnracsc wehn exdepos ot edleatev nclsivaaarrtu ,sseerrsup hsit iynecgom nrsspeoe niaeescrs plaareypirlc saictnerse nda topsrcet lsaiialeprc mrof a cnimontctoa seir ni their alvsruranatci ereps.rus" +7

usmleaspirant2020 p/d2tw+Rf4wBl1r:wanwsosa/ce/l/mcpln4htof/ls/p.omaoeho4+mrgiaouo.t+gFa2d iths ietcpru h!espl +3

stsfyt kmsea .senes mtseiomse ew sue itanBidlo)asoC(vC + oitldaonevni )(ECAI moocb ot calenba het esr,uesrp nad rpetevn egkalea dan eaem.d +

I think they are referring to maintenance of GFR and blood pressure relationships. Ergo the mentioning of the renal function. The precapillary resistance is "glomerular" precapillary resistance, so if that increases then GFR remains the same => prevents leakage of proteins and albumin => less edema.

https://www.youtube.com/watch?v=IRZsniaCfVQ

+2/- peqmd(75)

this is the concept of blood flow autuoregulation at the tissue level in response to increasesd arterial pressure via arteiolar remodeling via smooth muscle hyperplasia ....

+/- msw(4)

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submitted by staph_aureusxx(9)

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cypaariellrp erisscatne = inridsegbc hte rlsoeia.ert h'es gto imminal toniper ni hte eruni; dan no umbnal.i het yke aws pagyin noteiatnt ot het bodol sesurr.pe esPeursr is eugaerltd by eht teseaincrs veselss as arodbs lacsl ti hciwh si teh teoerlsira kaa llprperyaaic icre.netsas

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submitted by ∗notadoctor(175)

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'veI eben rescnihag rof my ceusro ofr shti btu nta'c smee to fdni t.i e,Hwvore eht ywa I ogtuthh uaotb it wsa atth ademe nsppaeh aiv hte a.ilpceralsi If treeh is encirsead esenctasri vai the elirayarcppl hrspetscin as uhmc oldbo lotwudn' eb bael ot egt iont het ras.ilepcali ehT oodlb odluw taedsin gte hendtus avi tneasaososm ot eht nse.vi Tish aetricl from hmsc.lvocpygoyoi nspailex ti a tietll ttereb: CV y:sPihlogyo Tisesu Eadem adn enaelrG lspirnciPe of rniyaaTlprlcas diulF cxEghaen

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submitted by chagas14(1)

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ybaeM het ueoisntq si leadgni wtih eth eccontp of ymongeic aotreiralr csnctotoiasoivrn hihcw is a arohnte i-enmetada m.enacshmi ehT rep lryaialcp escirpnth ocratctn ni nsesepor ot a sraei in P.B I tgo hte Q wgnro baecues I dckpei yphatclim lo.fw eTyh voel ot go fro the wath" les"e eletnme fo nya it.ocp I toncan nfid nya rensoa hwy eht hyctlimpa ipoton locdu eb norgw :/

4bv.phkitnww:/c3rlcsgs/o/otb.s5tKcliB/iwornh.a5mN4.epno/=?skCceh eht uiferg 41. hTe gnMari fo yaeSft tsigAna adEme iorFontam – aemdE yftSea rcasFot

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submitted by ∗adong(144)

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In iindoadt ot atwh ahs yraalde been dasi I kthni an pttrmiona oiptn in eht isnqeout asw eoyuatrgrl sastdjmnuet hwhic tosnpi omer saodrtw rrleoaitar nitlag.euro

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tt00e:o/7b6fb.725adsd9c/3uo2eeneed211o0dh6fn.ty7ie5l90/2pddct9920c/2u7fd0e30rfac

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submitted by ninja3232(11)

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eWhn" ealrtrai seperurs slf,al ncoegymi enot si dcederu in esilrretoa, iandeesrcg tireh csranisete ot wlof dan nitinmaigan rcapyllia sursepe.r sheTe bsnvtoiaerso seugsgt ttha ylilaprac uesrersp yam eb lerdgetau evor eth emas negra of puersers cgesanh voer ihcwh fwol is tauoudgaeetlr ni a nvgie anogr. Ie,dnde romf eth :ro"natlie

o53wpNgBik/o5ntc..mi/hlnw/:vb.notw4.4//Khbss

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submitted by ∗hello(429)

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hyw si mpaasl itocnco ussreper rnw?og

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rainlad I nkith ti's bcaeeus we wduol tcepxe ot ees soem eomr iabrluriemp/niratiouaun if het msaalp nioocct rusrespe ahd edarseinc ot scnoetmeap +1

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submitted by ∗ferrero(48)

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A rvye lsiaimr uoitsneq I eavh eens in asbQkn wlil aks hwy a iteapnt whit ightr rheta ifealur sode ton opdleve eamde nad eht sranwe si creneidas mcyalhpti agre.aidn I ogt hsti uqtnoise orgwn iogirllnya sacebue I esaderwn ognla tsih nile of grnneaiso ubt I khint in tsih ceas it lal hsa ot od iwth HEWRE teh aretx srspreeu is icmgno .omfr In shti qunotsei eth pt sah sodilcita ynesnoeirtph so oyu anc khtin tuoba teh rpsreeus as nocmig rwa"r"odf os gctnnoricsti ilapecyplarr shtenciprs acn nevtrep na nesrciae in respuesr in eht palrlycia bde. eeHvowr rfo grtih areht aiuferl thsi txrea fidul si cinogm from het ETIPSOOP noitcider ckbadsawr( morf teh gitrh )areht and oiccnnisttrg iycprlaeparl tprhscnsei nac od igtnhon no( tepopiso iesd fo icyapallr )edb - het olny ywa ot npterev daeem si ot cirseena laitmcyph aai.ndrge

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submitted by ∗usmleuser007(464)

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oAcirt olicstaDi s euePrrs

Hihg PTR = ghhi DP
igHh RH = hgih PD
hHgi SV = hghi DP

troicA tlisSocy Pere rsus

Hghi ttnlcrCyoiiat = ghhi PS
ighH SV = hihg PS
owL Cmaocielpn = hihg PS

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submitted by ∗spow(50)

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I sloa tkihn that the iontp ebing dema reeh is tauob nema eaartlri epsrusre MP,A() wichh is hawt rooueuaygrtalt ytmesss aalytclu nhcega aedbs o.n Bseecua he ash scnieader PMA (ude to irencesda BD,)P teh ealirilspca wlil ocrnisttc to niniamta nsnctota efe/pslurwors oruhght eth ayralcpil ebd.

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submitted by ∗divya(75)

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i nt'do khtni you ndee to tkihn lla ttha u.hcm olok at lla het iopotns nda khitn fo awth eahsnpp hwen htye r inaeseA.,c B, ,C D adn F all can scaeu altrtiensiti mt.euda Be srcnaniige eprllpryiaca etcrsinesa dtnifyeile 'seodtn.

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drzed dacsnereI tmhipacyl fowl wdlou ont ceusa iniltatirste meda.e +1

123ojm tbu ti enotds' yas cans"ieer ",ni it jstu syas yoreuatg"lr tjuasdmetns in." +1

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submitted by ∗usmleuser007(464)

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.1 Aoticr lctsiaiDo eseurrsP 
    .1 iHhg RTP = ghhi D
P    .2 hgHi RH = ghih P
D    .3 hiHg VS = gihh DP .
2 oirAct soltciyS ePsserur 
    1. gihH niytiltCarotc = hhgi SP
    2. High SV = ihgh PS
    .3 oLw Cpanlceimo = gihh P
S

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yex M./oypuhi/lt2Mopcaicy10lntrov:/socchtmgo/sriic This hepls hooms,we hte irfst rpta batuo lrycialpa urep.ress +

usmlelol tstha' eht xpe ::artp Teh avreega lripaalyc tisrtaohcdy resseupr is emtiedenrd by araetilr dan uesovn ssrerpesu (PA and )PV, dan by teh iraot fo oerptpaclp-yirsot-al trencaisess ).RA(VR/ An srianeec in tereih aatreril or usneov spuserre iwll irecsane alpliycar ersr;upes v,ehwreo a genvi gehcan ni PA is ynlo ubota enif-ofth as fieeftcve ni cginnagh CP sa eht meas laseobut anehcg ni .PV asceBue uosnev racitsnese si iyltealver o,wl anhgesc in PV rae edaiyrl smtanrettid bkca ot het yrpl,caila dna vycoeesr,nl ebcesau eartialr iresncetas is elltiearyv ,ihgh ngecahs ni PA rea yolrop tttnmaedisr natwresdom to eth lrl.ayacip +1

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