msyamp
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i dont think it can be caluclated. our body is not like a drum filled with water. 
i am not sure
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| robin082006
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ha ha
but actually Kaplan shows the way to calculate it
try msyamp
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| Doc2378
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ok...here's a random guess... increase in serum Na+ concentration =10meq/3L= 3.3 meq/L Serum osmolality is approx. = 2 * serum Na conc + 10 New ECF osmolarity= 285 + 2* 3.3 = 291.6 meq/L
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| msyamp
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no i think you shud distribute water to intracellular and extracellular. and the na only to extracellular.
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| Doc2378
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yes I agree...normally I'd split it up in a 2:1 ratio between the ICF and the ECF but in this case it is complicated by the fact that the Na+ would tend to pull the water to the ECF??
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| malinda
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i was about to post the same question.Kaplan is calculating in a very difficult way.I am hardly grasping anything.
Lets try
ECF osmolarity=total milliosmoles in body/total body water
---total milliosmoles=total body water x ECF osmolarity
=42L x 285
=11,970
=add new sodium added from potato chips=11,970 + 10=11,980
now total body water after addition of water=3L(newly added water)+14(initial ECF)+28L(ICF)
--------------->new osmolarity=total milliosmoles in body/TBW
=11980/45
=266 mosm /L
If do it in a simple way,adding 10 meq os Na wont change much of osmolarity but 3 L of water decreases it.266 is the only option less than 285 hence the correct answer.ALL Q BANK EXPLAINATION GUYS
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| robin082006
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excellent malinda
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| msyamp
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ya. i dint see that way the simple way. any way. good one. thanks melinda
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