Euvolemic hypernatremia?? In Gojian

[K Niner]

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In Rapid Review Goljian says in the situation where TBNa remains constant and TBW is decreased you have a euvolemic hypernatremia. Why is this called "euvolemic" if you have what I assume to be a loss of fluids?

Is this assuming that you intake water to maintain your fluids? Please explain thanks!!

(On page 98 section 4 c in Rapid Review pathology 4th edition)

 

[tvelocity514]

Just recalling from my renal class, SIADH and DI are always euvolemic. I think this is an example of DI.
When you lose TBW --> POsm and serum Na+ are increased (euvolemic hypernatremia).

Both compartments are contracted but ECF contraction is mild, because there is no loss of Na+