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NBME 23 Answers

nbme23/Block 1/Question#50 (41.4 difficulty score)
A 45-year-old woman with coronary artery ...

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submitted by welpdedelp(227),
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0*3 10.5. Tkinh aoutb t,i eehrt si x wflo ihtw na exgyon inonnartcotec of sy-o- to idfn otu het dereilyv uoy ustj pltuymli tmeh roh.geett

yotsubato  One of those questions too simple to believe its actually the right answer +29  
mimi21  Right, I was like this is too simple lol ! im not sure if this is also a good tip but I tend to look at the units they are asking for and double check my math to make sure I end up with them. +7  
osgood-schlatter  what equation is it exactly? +  
arcanumm  Literally did not even conceptualize this question, just looked at the units. +5  

submitted by sam1(16),
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hatW obuat teh nldidaoita olfw ohgurth hte celfucirxm?

maddy1994  exactly man i got 4.5 and i thought he asked ventricle and left circumflex should be there so i put 5 ...glad someone thought like me.i was just cursing myself for over thinking. +10  
djtallahassee  Yea put 5 here too. they are essentially saying the myocardial oxygen supply to the left ventricle comes from the LAD. Not sure if true or not but figured that the LCX would at least contribute 20% of the blood +  
justherefortheyield  100% agree. This is definitely a better answer. I assumed the # would be beyond 5 but that it was closest to the right value. +  

submitted by nor16(58),
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lla htoes nno amhts uysg ereh, ntdo spki ehest tos,einusq ryt to ganarre teh s,unti eehr y´udo esaiyl nidf uto taht uoy utjs evha ot u!lpmlity eviG ti a rty :)-

charcot_bouchard  This was like Filtered Load ques of Renal. Where u multiply icoming fluid (GFR) with the desired substances conc (Px) so FIltered load of A is GFR x Pa Same here. Myocardial O2 supply is Blood flow x Conc of O2 in that blood flow +4  
powerhouseofthecell  For us non math folk, how do you compare the mL/min to mLO2/mL to get mLO2/min? Sorry. Do you just find out that when you have the units beside each other, cross multiplying them gives you the correct one? I need to know this trick. I can't find this on google. +  
abcdefbhiximab  mL/min * mLO2/mL = (mLmLO2)/(mLmin) where the mL's cancel out = mLO2/min +  

submitted by thelupuswolf(9),

This question is not good. The math is simple, sure. But the PDA (which is most of the time a branch of the RIGHT coronary artery) supplies 2/3 posterior walls of the ventricles (FA 2019 p.281) which I'm sure is a significant portion of the left ventricle. The LAD specifically does not account for the entirety of the oxygen supply to the left ventricle, but about 45-55% according to wiki. If the question asked, "How much oxygen is delivered to the left ventricle by the LAD" it would have been acceptable.

submitted by guillo12(47),
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kFic cpienlpi:Cr= O aeRt of 2O otiesnmoncouurrnp/iesvat 2O otnneacrnotic

CO smnea arcdcia pouttu or lFwo fo dobol

charcot_bouchard  This wasnt Fick +1