mistral92
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1///In which case hyposmotic volume contraction occurs?
a/.adrenal insuff
b/.diarrhea
c/.sweating
D/.fever
2/// in which case hyperosmotic volume contraction occurs?
a/diabetes insipidus
b/adrenal insuff
c/diarrhea
d/SIADH
3/// sweating in a hot desert...is a kind of...
a.isosmotic volume contraction
b.hyposmotic volume contraction
c.hyperosmotic volume contraction
3.B in this case hematocrit would be
a.increased
b.decreased
c.unchanged
4.Diarrhea is a kind of :
a.isosmotic volume contraction
b.hyperosmotic volume contraction
c.hyposmotic volume contraction.
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| anne
Forum Elite
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1a
2a
3A-a
3B-a
4a
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| mistral92
Forum Senior
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hi ann good job... question 1; 2 and 4 are correct...3 A and B are not! try again...
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| anne
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3A-c(probably bec of more water than salt loss)
3B-c :?:
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| asmi
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yep 3A..c and 3B is c
good Q thanks
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| mistral92
Forum Senior
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yes it is...sweating in desert cause hyperosmotic volume contraction bcause more water is lost...so ECF decrease osmolarity increase and ICF decrease...
hematocrit would not change because water shifts out of RBC decreasing their volumes." not easy".
good job anne...
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| usmleasr
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good q...can u explain these conditions :roll:
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| mistral92
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hi usmleasr...
during isosmotic expansion ( case NACL isotonic infusion): ECF increase. so Ht decrease.
during isosmotic contraction ( case of diarrhea): ECF decrease. so Ht increase.
for both the ICF and natremia remain unchange...remeber it is isosmotic!!!
hyperosmotic expansion case of high NACL intake: ECF and ICF run in opposite direction so ECF increase osmolarity increase Ht decrease and then ICF decrease...
hyperosmotic volume contraction case of fever D.Insipidus sweting...ECF decrease Ht remains unchange osmolarity of the ECF increase so the ICF decrease.
hyposmotic volume expansion case of SIADH ECF increse Ht decrease osmolarity of the ECF decrease then ICF increase.
hyposmotic volume contraction case of adrenal insuff ECF decrease Ht increase osmolarity of the ECF increase then ICF decrease.
hope this will help you.
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| mistral92
Forum Senior
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adrenal insuff is a case of hyposmotic volume contraction bcose of the loss of ALDOSTERONE...so more NACL is loose than water.
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| usmleasr
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thanks a lot mistral92.. :icon_salut:
i understood all except hypo-osmotic volume contraction...if ECF is losing more salt than water...implies it becomes hypo osmotic..so water will again enter ICF ...makin it increase isn't it?.. :oops: ..sorry i am not getting this..
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| mistral92
Forum Senior
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hi usmleasr sorry but i make a big mistake!!!
you are correct i mean that in hyposmotic fluid contraction ICF INCREASE!!!! sorry for that!!!!
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| jalabert
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Are you sure about 3B? I find it hard to believe that if sweating in the desert, enough fluid would leave the RBC to keep the hct unchanged. I would think that hct would increase. Do you have a source for the answer specific to that question?
Thanks
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| mistral92
Forum Senior
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hi jalabert; i recognize that it's not easy to understand; like many people i tought that Ht should increased unfortunately it remains unchange bcose water shifts out of RBC decreasing their volumes ans offsetting the concentrating effect of the ECF volume contraction. ( that is the explanation given in BRS...page 139) :wink:
good luck.
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| jalabert
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Thanks
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| dxtxpx
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yes BRS physio 2nd ed page 156 has really explanatory figures on all these conditions along with a table. very helpful
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| shahnawaZ077
Forum Newbie
Topics: 2
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hi, i haave started preapring for usmle ,i am reading physiology,im reading kaplan notes
can u suggest if i need to read other books, what r u reading,,,,waiting for reply,
u can mail at shahnawaz077@yahoo.com
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| shahnawaZ077
Forum Newbie
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hey thanks for advise,
do u have any stuff which u could send me through mail,any usmle questions ,notes etc
i would be thankfull to you
u know somewhere in chicago where i could get used books or stuff for cheap
i really appreciate ur advise
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| rubensssss
Forum Guru
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This is a very good question
1- wll be A
Adrenal insuf. hyposmotic vol contraction.
2 swering (loss of water)
3 Will be C
Sweting -hyperosmotic vol contraction
3b will beC,
4 will be A
Well I see that answer were already given.
___________________
Ruben sssss
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