electrolyte vignette
TRANSCRIPT
Fluid and Electrolyte Conference
Joel topf, MDNephrology FacultyProvidence Hospital
Friday, February 27, 2009
Friday, February 27, 2009
Friday, February 27, 2009
Friday, February 27, 2009
CC: weakness
Social Hx: bum
physical exam: starving
Friday, February 27, 2009
CC: weakness
Social Hx: bum
physical exam: starving
presentation
EtOH 44
1282.8 22
92 12
0.6128
Friday, February 27, 2009
least sick patient you admitted
Friday, February 27, 2009
problem list
Friday, February 27, 2009
problem list
weakness
hyponatremia
hypokalemia
Friday, February 27, 2009
Hypokalemia: differential diagnosis
Friday, February 27, 2009
Hypokalemia: differential diagnosis
Decreased intake
Alcoholism
Starvation
Friday, February 27, 2009
Hypokalemia: differential diagnosis
Decreased intake
Alcoholism
Starvation
Renal losses
Diuretics
Vomiting
RTA
Hyperaldo
Friday, February 27, 2009
Hypokalemia: differential diagnosis
Decreased intake
Alcoholism
Starvation
Renal losses
Diuretics
Vomiting
RTA
Hyperaldo
GI Losses
DiarrheaFriday, February 27, 2009
Decreased intake945 outpatients with eating disorders
anorexia, bulemia, or both
ALL of the hypokalemic patients were abusing cathartics or inducing vomiting
NONE of the hypokalemia was due to restricted caloric intake alone
The restricted calorie subgroup was the most nutritionally deprived of all the subgroups.
95%
3%2%
Serum Potassium
>3.5 3.0-3.5 <3.0
Greenfeld, D., Et Al. Am. J. Psychiatry 152, 60-63 (1995).
Friday, February 27, 2009
Intake does matter in experimental settings but clinical relevance is questionable
A compilation of 7 separate metabolic balance studies reveals the following graph
1.00
1.75
2.50
3.25
4.00
0 200 400 600 800
Serum K with dietary restriction
Ser
um
K (
mE
q/d
L)
K defecit (mEq)
Friday, February 27, 2009
61 patients with weekly alcohol ingestion greater than 600g/wk.
No cirrhosis of hepatitis, renal disease or, acute medical condition.
Admitted for inpatient detoxification for 4 weeks
Alcoholism
De Marchi, S. et al. N Engl J Med 1993;329:1927-1934Friday, February 27, 2009
admission 28-days
potassium
magnesium
3.8 4.4
1.4 1.7
Friday, February 27, 2009
Vomiting induced hypokalemia is not due to GI losses
Friday, February 27, 2009
Vomiting induced hypokalemia is not due to GI losses
potassium content of stomach fluid is 15 mEq/L
Friday, February 27, 2009
Vomiting induced hypokalemia is not due to GI losses
potassium content of stomach fluid is 15 mEq/L
How much vomit to get a 120 mEq potassium deficit?
Friday, February 27, 2009
Vomiting induced hypokalemia is not due to GI losses
potassium content of stomach fluid is 15 mEq/L
How much vomit to get a 120 mEq potassium deficit?
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Glomerulus
Proximal tubule
Loop of Henle
Distal convoluted tubule
Collectingtubule
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Friday, February 27, 2009
Vomiting induced hypokalemia is due to renal losses
Vomiting causes metabolic alkalosis
Increased serum bicarbonate is dumped into the urine
urine potassium can rise to 80-120 mEq/L
Friday, February 27, 2009
Hypokalemia: Treatment
Potassium is 2.8
How much poassium will you give:
100 x (4–k)
Friday, February 27, 2009
Orders:
Friday, February 27, 2009
Orders:
banana bag
Friday, February 27, 2009
Orders:
banana bag
D5LR at 80 an hour
Friday, February 27, 2009
Orders:
banana bag
D5LR at 80 an hour
KCL 40 mEq IVPB
Friday, February 27, 2009
Orders:
banana bag
D5LR at 80 an hour
KCL 40 mEq IVPB
KCL 80mEq orally split over two doses q4 hours
Friday, February 27, 2009
1282.8 22
92 12
0.6128
Initial Labs
Friday, February 27, 2009
1323.2 24
100 10
0.694128
2.8 2292 12
0.6128
Initial Labs Next morning
Friday, February 27, 2009
120 mEq and he’s still low
1323.2 24
100 10
0.694
Friday, February 27, 2009
120 mEq and he’s still low
repeat treatment
check magnesium
1323.2 24
100 10
0.694
Friday, February 27, 2009
120 mEq and he’s still low
repeat treatment
check magnesium
Ca
PhosMg
1323.2 24
100 10
0.694
Friday, February 27, 2009
120 mEq and he’s still low
repeat treatment
check magnesium
8.8
2.21.2
Ca
PhosMg
1323.2 24
100 10
0.694
Friday, February 27, 2009
Problem list
hypokalemia
hypomagnesemia
hypophosphatemia
hyponatremia
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
Ca++
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
Ca++
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP Mg
Mg
Mg
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Mg
Mg
Mg
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
K+
K+
K+
Friday, February 27, 2009
Na, 2Cl+ -
K+
K+
Ca, Na, Mg+ + +
+
++
+
++
+
ATP
ATP
ATP
Na, 2Cl+ -
K+
Ca, Na, Mg+ + +
+
++
+
++
++
Friday, February 27, 2009
Friday, February 27, 2009
FIX THE MAGNESIUMSAVE THE POTASSIUM
Friday, February 27, 2009
magnesium
Friday, February 27, 2009
magnesium2 grams of Magnesium Sulfate IVPB over an hour or so
Friday, February 27, 2009
magnesium2 grams of Magnesium Sulfate IVPB over an hour or so
Friday, February 27, 2009
magnesium
doesn’t really work
the next day it’s still low
Most of the IV magnesium is immediately dumped in the urine
you need to drip it in over as long as possible
i like 6g (48.6 mEq) over 24 hours
Friday, February 27, 2009
1282.8 22
92 12
0.6128
3.0
day one labs
Friday, February 27, 2009
8.8
2.21.21323.2 24
100 10
0.694
1282.8 22
92 12
0.6128
3.0
day two labs
Friday, February 27, 2009
day three labs
8.9
1.42.31333.9 24
98 10
0.694
8.8
2.21.21323.2 24
100 10
0.694
1282.8 22
92 12
0.6128
3.0
Friday, February 27, 2009
problem list
hyponatremia
hypophosphatemia
muscle weakness
Friday, February 27, 2009
problem list
hyponatremia
hypophosphatemia
muscle weakness
0
1
2
3
4
Day 1 Day 2 Day 3
Ph
os (
mg
/dL
)
Friday, February 27, 2009
weakness
hypokalemia corrected
magnesium a little high
not enough to cause muscle weakness
Friday, February 27, 2009
hypermagnesemia
the most tolerated electrolyte abnormality
Upper limit of magnesium 1.8
pre-eclampsia magnesium 6-8
Lethal magnesium 14
Friday, February 27, 2009
Weakness
Hypophosphatemia
Friday, February 27, 2009
differential dx
Decreased phosphorous absorption
Intracellular shift
Increased renal excretion
Friday, February 27, 2009
differential dxIntracellular shift
CalcitoninCatecholamines
EpinephrineDopamineTerbutalineAlbuterol
InsulinCarbohydrate infusionsrefeeding
Respiratory alkalosisRapid cell proliferation
Treatment of anemiaCML in blast crisisAML
Decreased phosphorous absorption
Dietary insufficiencyMalabsorptionPhosphate binders
CalciumMagnesiumAluminumSevelamerLanthium
Vitamin D deficiencySteatorrhea
Vitamin D resistant ricketsGlucocorticoids
Friday, February 27, 2009
differential dxIncreased renal excretion
Volume expansion/natriuretic states
IV BicarbonateBicarbonaturiaGlucosuriaDiuretics
Acetazolamide is the most phosphaturic
High salt diet or saline infusionHyperaldosteronismSIADH
Paraneoplastic syndromePTHrpTumor induced osteomalacia
Renal transplantationAcute malaria (falciparum)X-linked hypophosphatemic rickets
Fanconi syndromeAlcoholismMultiple myelomaAmoniglycosidesHeavy metal toxicityChinese herbsCongenitalIfosfamideCisplatinCystinosisWilson’s DiseaseHereditary fructose intolerance
GlucocorticoidsHyperparathyroidismHypercalcemiaMetabolic acidosis
Friday, February 27, 2009
differential dx
8.9
1.42.3
8.8
2.21.2
3.0
Friday, February 27, 2009
differential dx
alcoholism
refeeding syndrome
malabsorption
respiratory alkalosis
Saline infusion8.9
1.42.3
8.8
2.21.2
3.0
Friday, February 27, 2009
differential dx
refeeding syndrome
8.9
1.42.3
8.8
2.21.2
3.0
Friday, February 27, 2009
Transcellular redistribution is movement of phosphorous into cells. This is usually transient and, in the face of normal total body phosphourous is harmless. However, in the face of pre-existing phosphorous depletion, this transcellular movement can provoke serious symptoms including death. The most severe cases are
found with refeeding syndrome.
Weinsier and Krumdieck, 1981, Am J Clin Nutr, 34, 393-9
Friday, February 27, 2009
Starvation decreases total body phosphorous.
However, serum phos remains normal due to movement of phosphorous out of cells.
W i t h r e f e e d i n g , i n s u l i n m o v e s phosphorous into cells, in order to phosphorylate carbs as part of glycolysis.
This unmasks the previous phosphorous depletion.
Friday, February 27, 2009
this is worse with fructose
conversion of fructose to fructose-P is unregulated
causes rapid consumption of Phos and ATP
the loss of ATP is thought to be the cause of fructose toxicity
Friday, February 27, 2009
give phos
stop carbs
Friday, February 27, 2009
Stop the D5LR
Started 8 ounces of milk four times a day
Used a packet of KPhos
Friday, February 27, 2009
IV sodium phosphorous
8mmol q6 hours
target 32 mmol in a day
careful in renal failure
Friday, February 27, 2009
day four and five labsDay Na K P Mg
1
2
3
4
5
128 2.8 3.0
132 3.2 2.2 1.2
133 3.9 1.4 2.3
131 3.8 1.8 2.2
130 4.2 2.8 1.8
Friday, February 27, 2009
problem list
hyponatremia
Friday, February 27, 2009
Specific gravity on admission:
1.005
What’s the specific gravity in:
hypervolemic hyponatremia: heart failure? Cirrhosis? Nephrotic syndrome?
Euvolemic hyponatremia: SIADH?
Hypovolemic hyponatremia: diuretics? GI losses?
Friday, February 27, 2009
Friday, February 27, 2009
What regulates specific gravity?
Friday, February 27, 2009
What regulates specific gravity?
ADH
Friday, February 27, 2009
We start with an increase in the plasma osmolality
What regulates specific gravity?
ADH
Friday, February 27, 2009
We start with an increase in the plasma osmolalityThis is detected by the brain
What regulates specific gravity?
ADH
Friday, February 27, 2009
We start with an increase in the plasma osmolalityThis is detected by the brainThe brain releases ADH
What regulates specific gravity?
ADH
Friday, February 27, 2009
We start with an increase in the plasma osmolalityThis is detected by the brainThe brain releases ADHADH acts on the kidney
What regulates specific gravity?
ADH
Friday, February 27, 2009
We start with an increase in the plasma osmolalityThis is detected by the brainThe brain releases ADHADH acts on the kidneyThe kidney reacts by retaining water and producing asmall amount of concentrated urine.
What regulates specific gravity?
ADH
The retained watergoes here
not here
Friday, February 27, 2009
What do all of the etiologies of hyponatremia have in common?
What regulates specific gravity?
ADH
Friday, February 27, 2009
What do all of the etiologies of hyponatremia have in common?
What regulates specific gravity?
ADH
ADH
Friday, February 27, 2009
Hyponatrmia Occurs When Water Intake Exceeds Excretion
Friday, February 27, 2009
ADH Decreases Urine Volume
Friday, February 27, 2009
Friday, February 27, 2009
Our patient has a low specific gravity.
Friday, February 27, 2009
Our patient has a low specific gravity.
ADH independent hyponatremia
Friday, February 27, 2009
Our patient has a low specific gravity.
ADH independent hyponatremia
psychogenic polydipsia
Friday, February 27, 2009
Our patient has a low specific gravity.
ADH independent hyponatremia
psychogenic polydipsia
tea and toast or beer drinkers potomania
Friday, February 27, 2009
psychogenic polydipsia
Friday, February 27, 2009
psychogenic polydipsia
18 litersFriday, February 27, 2009
The kidney is able to concentrate urine to 1200 mOsm/L
The kidney is able to dilute urine to 50 mOsm/L
If a patient has a daily solute load of 600 mOsms. What is:
The minimal amount of urine he can produce (maximum ADH)
The maximum amount of urine he can make (minimal ADH)
Friday, February 27, 2009
The kidney is able to concentrate urine to 1200 mOsm/L
The kidney is able to dilute urine to 50 mOsm/L
If a patient has a daily solute load of 600 mOsms. What is:
The minimal amount of urine he can produce (maximum ADH)
The maximum amount of urine he can make (minimal ADH)
500 mL
Friday, February 27, 2009
The kidney is able to concentrate urine to 1200 mOsm/L
The kidney is able to dilute urine to 50 mOsm/L
If a patient has a daily solute load of 600 mOsms. What is:
The minimal amount of urine he can produce (maximum ADH)
The maximum amount of urine he can make (minimal ADH)
500 mL
12,000 mL
Friday, February 27, 2009
600 mOsms is the typical daily solute load
so a patient requires a minimum of 500 mL of urine to remove the daily solute load
A patient making less than that is unable to clear the daily solute load
what is the definition of oliguria
Friday, February 27, 2009
What if the daily solute load is 100 mOsms?
What is the most urine they can make?
Friday, February 27, 2009
What if the daily solute load is 100 mOsms?
What is the most urine they can make?
2,000 mL
Friday, February 27, 2009
What if the daily solute load is 100 mOsms?
What is the most urine they can make?
2,000 mL
What happens if they are getting IV fluids at 100 mL/hour?
Friday, February 27, 2009
An alcoholic gets much of his daily calories from alcohol.
Alcohol is metabolized to CO2 and water
no solute for the kidney to excrete
Low daily solute load
Friday, February 27, 2009
A tea and toast diet refers to a carbohydrate rich diet free of proteins
Friday, February 27, 2009
Both beer drinker’s and Tea and Toast respond to increased protein intake
Usually get a brisk response to crystalloids
Friday, February 27, 2009