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NBME 23 Answers

nbme23/Block 3/Question#22 (reveal difficulty score)
A 54-year-old woman with rheumatic heart ...
Intra-alveolar transudates ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +7  upvote downvote
submitted by shaydawn88(8)
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Is it intra-alveolar transudates because this patient might have HF d/t a. fib and left atrial enlargement-> inc hydrostatic pressure-> transudate pleural effusion?

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sajaqua1  Basically. +7
medschul  Why can it not be arterial hypertension? +2
meningitis  I think Arterial HTN is referring to Pulmonary Artery HTN which would be present in LT HF in the long run with RT HF and edema. Pulm HTN would cause a backflow, and doesn't really answer the question "explain the patients Dyspnea". At least, that's how I saw it. Hope this helped. +6
sugaplum  the question has 2 murmurs, so does she have aortic stenosis too? i guess it is not relevant since it asked for what is causing her SOB +2
nukie404  I guess pulmonary HTN would happen in response to increased pressure after the edema happens, and would cause backflow (to the RV) over pulmonary edema. +
vulcania  There's a really great diagram in UWorld (QID 234) that explains what happens as a result of mitral stenosis. Very similar sounding to the patient in this question. +
srdgreen123  @sugaplum, yes rheumatic heart disease can cause mitral and aortic stenosis. Rheumatic aortic stenosis can be distinguished from degenerative aortic stenosis by 1)coexisting mitral stenosis and 2)fusion of the commisures. +1



 +3  upvote downvote
submitted by โˆ—dentist(94)
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rheumatic hrt dz = mitral stenosis = pulmonary edema (bilateral crackles) = dyspnea

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 +2  upvote downvote
submitted by โˆ—an1(114)
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RHD. Early MR, late MS. Diastolic at the apex indicates Mitral stenosis.

Both cases result in fluid building up in the LA and pushing backwards into he lungs. Presents with pulmonary crackles and reduced compliance. Imagine all this fluid going into the lungs, and it ends up seeping out of the vessels because it can't go backwards into the Right heart, there's blood there and it can't go forward, traffic is blocked up in the Left heart too. So it goes to pulmonary tissues. Now, this means that the HYDROSTATIC pressure in the pulmonary vessels must be increased (recall: hydrostatic is push and onocotic is pull). When discussing exudate and transudate, it mentioned that anything that had to do with hydrostatic or oncotic pressures was transudate.

Point to note: this is not fluid going into the lungs due to increased capillary permeability; that's due to burns, injury, toxins and that would be exudate

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 +0  upvote downvote
submitted by โˆ—kimcharito(19)
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it is normal irradiation to the RIGHT neck? what does it mean?

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krewfoo99  @kimcharito Aortic stenosis radiates to the carotids FA pg. 285 (2018) +2



 -9  upvote downvote
submitted by โˆ—charcot_bouchard(574)
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Old dudette have Aortic stenosis. Atrial contraction become essential for this patient. so AS + AFIb is dangerous because this reduces the LV preload significantly and this patient develops HF. So AFib in AS patient need to correct immediately

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aisel1787  she's not so old! stupid comment +1



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