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NBME 23 Answers

nbme23/Block 1/Question#50

A 45-year-old woman with coronary artery disease ...

4.5

A 45-year-old woman with coronary artery disease ...

4.5

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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.
+5

all those non maths guys here, dont skip these questions, try to arrange the units, here youÂ´d easily find out that you just have to multiply! Give it a try :-)

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
+3

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.
+

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.
+5

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.
+

Fick principle: CO= Rate of O2 consumption/arterivenous O2 concentration

CO means cardiac output or Flow of blood

submitted by welpdedelp(137), 2019-05-27T15:53:10Z

30* 0.15. Think about it, there is x flow with an oxygen concentration of y--so to find out the delivery you just multiply them together.