fluid & elyte - tehran university of medical...
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Fluid & Elyte
Case Discussion
Hooman N
IUMS
2013
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Objectives
• Know maintenance water and electrolyte
requirements.
• Assess hydration status.
• Determine replacement fluids (oral and iv)
• Know how to approach to dyskalemia
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Approach to Fluid Calculations
1. Maintenance: Determined by a ‘system’:
a. Caloric expenditure method
b. Holliday-Segar method
c. Surface area method
2. Deficit: Determined by acute weight
change or clinical estimate
3. Ongoing losses: Determined by measuring
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GOAL OF MAINTANANCE FLUIDS
• Prevent dehydration
• Prevent electrolyte disorder
• Prevent ketoacidosis
• Prevent protein degradation
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Maintenance Fluids
• Holliday-Segar Method
– Estimates caloric expenditure from weight, assuming that for each 100 calories metabolized, 100 ml H20 are required.
Body Weight Water
ml/kg/day ml/kg/hr
First 10 kg 100 4
Second 10 kg 50 2
Each additional kg 20 1
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Example: 8 year-old weighing 25kg
• ml/kg/day
– 100 (for 1st 10 kg) x 10 kg = 1000 ml/day
– 50 (for 2nd 10 kg) x 10 kg = 500 ml/day
– 20 (per remaining kg) x 5 kg = 100 ml/day
1600 ml/day
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A 6 kg child needs 600 ml/day, which equals 25 ml/hr
A 35 kg child needs 1800 ml/day,which equals 75 ml/hr
A 14 kg child needs 1200 ml fluids with:
Na 36 mEq (3 mEq/100 cal)
K 24 mEq (2 mEq/100 cal)
Cl 48 mEq (4 mEq/100 cal)
Examples
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Maintenance Electrolytes
Electrolyte mEq/100 ml H2O
Na+ 3 (2-4)
K+ 2 (2-3)
Cl- 4
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Modifications
Increase Decrease
Fever (12% for each oC Renal failure
above 37 oC ) Heart failure
High ambient temperature Inappropriate secretion
Diabetes mellitus of ADH
Diabetes insipidus High-humidity respiratory
Vigorous exercise therapy
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Acute Renal Failure
Meticulous management of fluids and
electrolytes is required, including twice daily
weights, strict I/O’s and close laboratory
monitoring
Oligo-anuric patients should receive fluid
intake equal to their total output; output
must include insensible losses
Insensible losses should be replaced with
D5W (or D10W)
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Assessing Hydration Status
• History
– Volume of liquid intake
– Frequency of wet diapers/urination
– Frequency/quantity of diarrhea
– Recent weight (if known)
• Labs
– BMP if admitting the patient
• Serum sodium
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Deficit
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Tenting
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Normal
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moderate
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severe
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Urine output
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Vital Sign
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Sign & Symptoms Mild Moderate Severe
Wt loss 3-5% 6-9% >10%
General condition Alert, Restless Thirsty, lethargic Cold,sweaty,limp
Pulse Normal rate,
volume
Rapid,weak Rapid,feeble
Respiration Nr Deep,rapid Deep,rapid
Ant.fontanelle Nr Sunken Very sunken
SBP Nr Nr/ low OH Low/ unrecordable
Skin turgor Nr Decreased Markedly decreased
Eyes Nr Sunken,dry Grossly sunken
Mucus membrane Moist Dry Very dry
Urine output Adequate Less,dark Oliguria, anuria
Capillary refill Nr <2 sec > 3 Sec
Estimated deficit 30-50ml/kg 60-90ml/kg 100ml/kg
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%100)/( xPIWILPIW
% Dehydration
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ECF and ICF Percentage of
Loss
% fluid of deficit % fluid of deficit
Duration of illness from ECF from ICF
<3 days 80 20
>3days 60 40
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Na K Cl HCO3
Gastric juice 20-80 15 125 0
Small-intestinal juice 100-140 15 155 40
Diarrhea 10-90 40 40 40
Sweat normal 10-30 10 25 0
Sweat CF 50-130 15 75 0
Electrolytes in Body Fluids (mEq/L)
Normal saline 154 0 154 0
½ Saline 77 0 77 0
Ringer Lactate 130 4 109 28
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Third-spaced fluid
– 18 -24 H: Sequestration of fluid
• Fluid is isotonic, Check urine output
Surgical trauma Type of surgery Fluid
replacement
Minimal Inguinal hernia
repair1-2
ml/kg/h
Moderate Ureteral implantation 4ml/kg/h
Severe Scoliosis, bowel
obstruction>6ml/kg/h
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Oral vs. IV Replacement
• Oral rehydration therapy (ORT) is preferred for mild – moderate dehydration unless
– emesis is intractable
– stool losses > 10 cc/kg/hr
– consciousness is impaired
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IV Emergency Replacement – AKA “Boluses”
• What fluid?
– Isotonic fluid
• 0.9% NS, Lactated Ringers
• NO dextrose-containing fluids
• How much fluid?
– 20 cc/kg over 20-30 minutes.
• Patients with congenital heart disease or renal insufficiency - ~10 cc/kg over 30-60 minutes.
• How many boluses?
– Enough (although consider pressors if you’re needing more than 60-80 cc/kg)
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IV Maintenance Fluids
• 3 important components
– Dextrose
• D5 for most children; D10 in the NICU
– Potassium (except for patients with decreased urine output or renal insufficiency)
• Usually add 20 mEq/L
– Sodium
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Common IV Fluids
Fluid Na (mEq/L)
D5W 0
0.9% NaCl (NS) 154
0.45% NaCl (1/2 NS) 77
0.2% NaCl (1/4 NS) 34
Lactated Ringers 130
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ORT
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Which fluid do I choose?
• Consider the patient’s daily free water and sodium needs.– 5 kg infant
• FW: 5 kg x 100 cc/kg/day = 500 cc/day
• Na+: 5 kg x 3 mEq/kg = 15 mEq/day
• 15 mEq/500 cc = 30 mEq/L D5 0.2 NS
– 20 kg child• FW: (10 kg x 100 cc/kg/d) + (10 kg x 50 cc/kg/d) =
1500 cc/day
• Na+: 20 kg x 3 mEq/kg = 60 mEq/day
• 60 mEq/1500 cc = 40 mEq/L D5 0.45 NS
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A 2 year old has a 4-day history of gastroenteritis,
poor fluid intake and infrequent urination. On exam
you find dryness of the mucous membranes, sunken
eyes with mild tenting of the skin. The serum sodium
is 137 mEq/L.
The weight is 10 kg.
You determine the child is suffering from about 10%
dehydration.
What are the fluid and electrolyte requirements?
Case 1
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Isonatremic Dehydration
Patient is dehydrated and Na+ is 135-145 mEq/L
Determine fluid deficit as percentage of weight based on clinical findings
Determine which parts of deficit come from ICF versus ECF compartments based on duration of illness
ECF Na+ loss = ECF Fluid deficit (L) X 145
ICF K+ loss = ICF Fluid deficit (L) X 150
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H2O Na K Cl
(ml) (mEq) (mEq) (mEq)
Maintenance
Total deficit = 1000 ml
Extracellular fluid deficit
(60% of total)
Intracellular fluid deficit
(40% of total)
Total
1000 30 20 40
600 87 - 60
400 - 60 -
2000 117 80 100
Isonatremic Dehydration
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Phase Approach
PHASE 1– Emergency restoration of circulation if patient is hypovolemic
– 10-20 ml/kg of isotonic fluids only 40ml/kg
– No response 10ml/kg albumin/plasma/blood
PHASE 2– Replacement of ½ of the fluid loss (deficit and maintenance) in
first 8 hours
– Replacement of ongoing loss
PHASE 3– Replacement of remaining ½ of the fluid loss (maintenance
and remaining deficit) in next 16 hours
– Replacement of potassium after voids
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Case 2
• 3 m infant
• Loose watery stools
x3days
• Vomiting X4 during
last 12 hours
• No urine for 10 hours
• Wt : 5 kg , PR: 160
/min , RR= 60/min
• BP: 90/85
• Fontanels & eye
sunken
• Extremities cold , skin
mottled
• Loss of skin turgor
• No tear , weak cry
• Capillary refill time 3
sec
• Good sensorium
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• Deficit 10% ? ml/kg
• Calculate the first day fluid therapy
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Wt = 5kg Water Sodium Potassium
Maintenance
Deficit
Ongoing loss
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case 7
• A 7 year old boy presented with at least a weeks
history of abdominal pain and vomiting and
polyuria . He was mildly confused. BP= Nr., wt=25
kg
– PH=7.52 Na=137
– PCO2=44.6 K= 2.2
– HCO3= 38 Cl=91
– How do you approach to this patient?
– How do you treat ?
– What is the cause of hypokalemia?
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Wt =9 kg Water Sodium Potassium
Maintenance
Deficit
Ongoing loss
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• Treatment
– Oral
• Safest, although solutions may cause diarrhea
– IV
• Peripheral: do not exceed 40-50 mEq/L potassium - Avoid
temptation to rapidly bolus
• Central: 0.5 -1 mEq/kg over 1-3 hours, depending on
severity
– Replace magnesium also if low
• (25-50 mg/kg MgSO4)
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3.5-5.5 >2
2
1
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Case Study #8
• HPI:
– An eight month old infant with autosomal recessive
polycystic kidney disease presents with irritability.
She is on nightly peritoneal dialysis at home. The lab
calls a panic potassium value of 7.1 meq/L. The tech
says it is not hemolyzed.
What do you do now?
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Cardiac Monitor
• What is this rhythm?
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What is the immediate
treatment?
1- Calcium Gluconate
2- Hypertonic Saline
3- Insulin infusion for 4 H
4- Albuterol inhaler
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The goals of therapy, in chronologic order
1. Antagonize the effect of K on excitable cell
membranes.
2. Redistribute extracellular K into cells.
3. Enhance elimination of K from the body.
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Rapid treatment
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Elimination
J Am Soc Nephrol 21: 733–735, 2010.
Clin J Am Soc Nephrol 5: 1723–1726, 2010
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After infusing calcium gluconate , ECG showed sinus
rhythm, what is the next step of therapy?
1- Sodium Bicarbonate
2- Furosemide
3- hemodialysis
4- peritoneal dialysis
5- Kayexelate
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Any Question?