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Retired NBME 21 Answers

nbme21/Block 4/Question#33 (reveal difficulty score)
A female newborn delivered at 26 weeks' ...
Retina ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +8  upvote downvote
submitted by โˆ—hyoscyamine(59)
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FA gp 217. ooT uhmc nyoxeotgian nac scuea eefr rclaaid ageadm geindal to otyhapietrn of itmyurapetr

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mmm21  yOka i hmitg be rt,ddreae tub ywh i nโ€™tca ntdnesuard atth yteh r gnikas botau eth hngti tath is gemddaa ? ๐Ÿ˜‚๐Ÿ˜‚ +8
sahusema  iursy!Soel heT enitquso asys t"he aogl of entetrmat is eht ipntorceot of ihwhc fo het iogolnflw rstu?teru"cs fI oto uhmc 2O maeasgd teh iea,rnt ohw si iths rtttamnee psupoesd to eb ocrpitveet to the irant?e +2
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burak  htey din'dt veig het itepant foi2 0%10, iqesnuot kssa het nreaso for t.i but ni a rvey duptis ywa +31
naught  uSnaepmeltlp 2O yam saol aecus crnroauohpyonmlb spydaisal or inrairutnrltcave ahohmegrer rmangle(i arxtmi, oedalct in cbrutnrsviaeul nzoe NOT ohcrido pe)uslx +1
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soccerfan23  In orteh .w.t.hrseo.d otuenqsi is laylbcsia giansk why eyth evag eht ntpetai a i2of fo 299%-5 esdinat of %.010 Teh nosrea is secbuea %010 noygex wludo eadl ot tyetinahopr fo .umtyaetpirr heT lroew 59%92- oegynx llseve ctotrpe eht reitna mrfo .mdagea hTe iwrdogn fo teh qonsteui scuks tho moi. +3
randi  FA 1290 2p10 nderu rFee rdiacal jriuny mpslxeae +
umpalumpa  ofmr RNAUET oh2ngs:dacu0terl%ePntl2&2./2oe%%:rt0r%2etgD%atstt%i222tprIsi.pyatae0ar0xoeSh20ua%xg:s01ac%w#h20tnOaxSv72e=a7t5y0,dsswhxavteutueea2%sea0nn0%4ma0Ds%2o2nt2~oweh.%n=mmi2isn:Rntc//10w%gt0/ir%%eaOo,i2hhht0e;i%. el vSera ecetnr esutsid vhea wnsho a nhsiplirtaoe webeent a xyeh-nhgigo nrtioustaa adn R.PO tI meess ttha a %2aOt39S&g; sasrcieen eth srki fro vreees OPR dan dnee ofr petahyr +

Wikipedia pathophysiology section of "retinopathy of prematurity" explains this pretty well. Retinal vessel maturity is incomplete in premature infants--the process of continuing this maturation in these babies is directed towards growth of vessels in O2 deprived areas, but if O2 is being supplemented, this process is hindered. Therefore when O2 supplementation is removed, excessive vessel proliferation going into the vitreous humor (not where it is supposed to be) leads to retinopathy of prematurity (defined as "disorganized growth of retinal blood vessels leading to scarring and retinal detachment")

+7/- beanie368(27)

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 +2  upvote downvote
submitted by โˆ—mcl(671)
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"cnrohic hhig eoyngx satiauontsr nca lvreasdye etcfaf gunl nda eey euomtsoc fo retpmer tnas.i"fn ikln

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submitted by โˆ—divya(75)
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egera ihtw r. tru'beakhey gitynr ot sya that ipayrmr glao of tnremetat whit euletmanpslp 2o si ot amke srue teerh si no tanerli g.daame

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submitted by โˆ—ergogenic22(401)
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why is nietrcptoo fo eht rhdooci l,xepsu ormf aanrneviirttrcul uprrtue acnedrsyo to nergliam itmrax oeramgrehh ont a sbsieopl sean?wr

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 -4  upvote downvote
submitted by โˆ—lilmonkey(63)
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neyonA degrnai itsh suneiotq

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