Hyponathremia + plasms OSm normal
think about lipids / proteins
hyperlipidemia or MM
Hyponathremia + plasms OSm high
Glucose
mannitol
What is the only reason for Hyponathremia hypervolemic + Urine Na > 20
Acute or chronic kidney disease
What are could be the reasons for high ADH in the present of hypovulemia?
SIADH is true only when the rest are not
SIADH
volume status?
kidney function?
Urine OSm?
Volume- euovolumic
Kidney function- normal
Urine Osm > 100
what are the 3 main reasons for Hyponathremia with normal / low ADH
for PSychogenic + diet- UOsm is normal which means»_space; less Osmoles or lots of water eauvolemic
Which causes for Hyponathremia hypervoluemic + low Na in urine?
CHF
Chirrosis
Nephrotic syndrome
Renal failure- Hyponathremia Hypervolemic + high Na in Urine
What is the Defintion of Psuedo-hyponathremia?
low Na in blood when serum osmolality is normal ( > 275)
What is the correction of Na with Glucose
Add 1.6 for every 100 glucose above 100
What is the relations between ADH and urine Osmolarity?
UOsm > 100
testimony of ADH in the system
the main causes of hyponathemia with UOsm < 100:
1. Renal failure
2. Psycogenic polydipsia
3. Spaciel diet
What is the rate of correction of hyponathremia
8-10 in 24 hours.
no more then 18 in 48 hours
What is the rate of correction in severe symptomatic hyponathremia? and which type of fluid will we use?
fluid- Hypertonic seline 3%
rate- 1-2 an hour and up to 4-6 in the first hours.
do not correct over 8-10 in 24h
must check Na levels evey 2-4 hrs
Why we do not give normal Seline for SIADH
and what is the Tx for SIADH
Normal seline- can worse the hyponathremia
Tx SIADH
* Treat underline cause
* restrict water intake
* Na tablets
* Correct hypokalemia
if not worked:
Fusid
* Demecyclocycline- mainly for chronic
* ADH antagonists- VAPTAN suffix in hospitelized pt with CHF and hyponathremia only!
How we asses the efficacy excpected from water restriction?
ratio of electrolyte in urine vs Bloos
Urine Na + Urine K / Na in blood
when high ratio > 1 = more aggresive restriction
> 1 = up to 500 ml / day. less ~ 1 liter a day
Tx for Hyponathremia hypervoulemic?
Water restriction + fusid
Chirrosis, Renal failure, CHF
Etiology for Osmotic demyelination syndrome and presentation
option of tx?
From low to high your pons will die
when correction is above 8-10 in 24h or 18 in 48h.
de-meylinaiton of the pontine»_space; Quadraplagia and loss of face muscles.
lock in syndrome
Give desmopressin or free water (D5W)
Which electrolyte disbalance cause the highest mortality rate?
Hypernathremia (40-60%)
What are the 2 things present in hypernathremia?
in the pt
figure out why the pt is not drinking and why he is loosing water
what are the main reasons for kidney water loss in hypernathremia
> 3 liter a day
Nephrogenic DI causes
same for chronic interstitial nephritis and CKD
Central- problem in secrete ADH
First line tx in hypernathremia
Free water (PO or Zonda)
* if signs of hypovulemia»_space; IV isotonic seline
Not exceed 12mEq per day- cerebral edema
Tx for nephrogenic DI
Tx for Central DI
Desmopressin - ADH analog w/o the vasoconstriction affect
How to calculate Total body water
TBW= weight X 0.5women
or
0.6man