DrVirgo
Forum Hero
Topics: 1041
Posts: 3,342
|
For Euvolemic Hyponatremia in Kap(STEP 2-IM), the two examples which are listed are:
-SIADH and
-Psychogenic Polydipsia
IN BOTH these examples insn't the volume (ECF) INCREASED????
As I remember from Step 1 (Goljan)
Serum Na = TBNa/TBW
In both SIADH and Psychogenic Polydipsia:
-NO change in TBNa
-Increase in TBW
-Therefore Serum Na Decreases (HYPONatremia)
-BUT ECF should INCREASE, because there is a GAIN of FLUID.
(Remember those rectangle looking diagrams from Kap Physio with the ECF, ICF, and Osm)???
___________________
Our greatest glory is not in never falling, but in rising every time we fall.
|
| doctor123
Forum Senior
Topics: 12
Posts: 223
|
you r right
but then what else
___________________
ALLAH; guide me to the Path of Success.
|
| DrVirgo
Forum Hero
Topics: 1041
Posts: 3,342
|
Can anyone explan why the volume or ECF would be NORMAL in cases of SIADH and Psychogenic Polydipsia?
SIADH--> TOO MUCH ADH ---> Water reab. from CD ---> (should be INC. VOL)
Psychogenic polydipsia --> person drinks way too muchH20 --> should also be inc. vol
However in the step 2 notes it's listed that both these causes are EUvolemic.
Thanks.
___________________
Our greatest glory is not in never falling, but in rising every time we fall.
|
|
| |
| | | |
