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Comments ...

 +1  (nbme24#15)

not EPO bc it's asking what's made from the bone marrow. EPO is from kidney

lilyo  Thanks, I was wondering why EPO was not correct. So EPO synthesis would be stimulated in case of blood loss? its just wrong becase they ask specifically what is going to be produced in the bone marrow?
suckitnbme  @lilyo yes because it's specifically asking what the bone marrow is synthesizing. EPO would also be upregulated but this happens in the kidneys.

Subcomments ...

Dysmetria ( also, dysdiadokinesia and intention tremor) is lateral cerebellum. (E).

Ataxia is a problem with the central cerebellum (D) or at least thats the best I could come up with.

ronald-dumsfeld  I actually think D is pointing at the Flocculonodular lobe. See here: https://en.wikipedia.org/wiki/Flocculus_(cerebellar)#/media/File:Human_brain_midsagittal_view_description.JPG So a lesion at D would present with Nystagmus +1  
urachus  flocculonodular is medial (central). but yes it'll have nystagmus and truncal ataxia +  

submitted by colonelred_(66),

Looked it up and found that because you’re in a supine position for a long time you’re going to have increased venous return which leads to increased CO. This negatively feedsback on RAAS, leading to decreased aldosterone. As a result, you’re going to have increased diuresis which leads to decreased blood and plasma volume.

medstruggle  Doesn’t supine position compress IVC leading to decreased venous return? (This is the pathophys of supine hypotension syndrome.) There was a UWorld questions about this ... +3  
tea-cats-biscuits  @medstruggle *Supine position* decreases blood pooling in the legs and decreases the effect of gravity. *Supine hypotension syndrome*, on the other hand, seems specific to a pregnant female, since the gravid uterus will compress the IVC; in an average pt, there wouldn’t be the same postural compression. +3  
welpdedelp  this was the exact same reasoning I used, but I thought the RAAS would inactivate which would lead to less aldosterone and less sodium retention +1  
yotsubato  You gotta be preggers to compress your IVC +2  
nwinkelmann  Could you also think of it in a purely "rest/digest" vs "fight/fright/flight" response, i.e. you're PNS is active, so your HR and subsequently your CO is less? But the explanation given above does make sense. Also because I think just saying someone is one bed rest leaves a lot up for interpretation, maybe not with this patient because his pelvis is broken, but lots of people on bed rest aren't lying flat.... ? +1  
urachus  wouldnt low aldosterone cause low plasma sodium? choice B +2  
kpjk  could it be that, while low aldosterone levels decrease plasma sodium levels- there is also decrease in blood volume(plasma),so there wont be a decrease in the "concentration" of sodium +  
almondbreeze  FA 2019 pg 306 on Lt heart failure induced orthopnea - Shortness of breath when supine: increased venous return from redistribution of blood +  
almondbreeze  if there was no HF, it would lead to increased CO --> decreased aldosterone +  

Because you are supine, there’s increased preload going back to your heart (no need to work against gravity, your blood isn’t pooling in your legs as much either). As a result, ANP is secreted due to RA stretch, leading to diuresis and a reduction of blood volume.

urachus  When the person is lying down (supine position), gravitational forces are similar on the thorax, abdomen and legs because these compartments lie in the same horizontal plane. In this position, venous blood volumes and pressures are distributed evenly throughout the body. https://www.cvphysiology.com/Cardiac%20Function/CF017 +