4 sept 2013 · Hypertonic Saline ❑ Hyponatremia ▫ Hypotonic Fluid ❑ Hypernatremia ▫ Hypokalemia and Hyperkalemia ▫ Other Electrolytes (Mg, PO4,
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[PDF] 051800 Hypernatremia - University of Kansas Medical Center
Only hypotonic fluids are appropriate, including pure water, 5 percent dextrose, 0 2 percent sodium chloride (referred to as one-quarter isotonic saline), and 0 45 percent sodium chloride (one-half isotonic saline) The more hypoton- ic the infusate, the lower the infusion rate required
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2 jan 2019 · Use to treat shock, mild hyponatremia, metabolic acidosis, hypercalcemia Composition Uses/Clinical Considerations 0 45 NaCl (1/2 NS)
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4 sept 2013 · Hypertonic Saline ❑ Hyponatremia ▫ Hypotonic Fluid ❑ Hypernatremia ▫ Hypokalemia and Hyperkalemia ▫ Other Electrolytes (Mg, PO4,
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greater than 145 mmol/L 1,2 Hypernatremia is a common disorder Abbreviations: ½ Ns, 0 45 normal saline; D5W, 5 dextrose in water; I/o, intake /output
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10 fév 2020 · *D5 1/2 NS + 20 KCl in children less than 1 year increased risk of hyponatremia 2,3 Studies have been limited by a significant number of
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9/4/2013
1Last Chance Pharmacotherapy
Webinar - Fluids and Electrolytes
September 3, 2013
Judith L. Kristeller, PharmD, BCPS
Conflicts of Interest
I have no conflicts to disclose.
Overview
Total Body Fluid
Intravascular Volume Depletion
Fluid resuscitation vs. Maintenance IV Fluid
Osmolarity of IV Fluids
Hypertonic SalineHypertonic Saline
Hyponatremia
Hypotonic Fluid
Hypernatremia
Hypokalemia and Hyperkalemia
Other Electrolytes (Mg, PO
4 , Ca) and shortagesQuestion1 (Fluid Resuscitation) A 74yo female presents with a 3-day history of cough, fever to 102, and lethargy. Vitals/Labs: BP 72/40, HR115, CXR: LUL infiltrate, WBC 18,000, Hgb 12.5,
BUN/Cr 28/1.7 (baseline Cr 1.2), BG 82, UO 10ml/hr, wt72kg. PMH: CAD. After 500ml NS IV bolus, BP is
80/46. Which one of the followin
g is the most g appropriate treatment?A.Furosemide 40mg IV
B.0.9% NaCl 300ml/hr + Norepinephrine for SBP > 90C.1000ml fluid bolus with D5 / 0.9% NaCl
D.500ml fluid bolus with 0.9% NaCl
E.500ml fluid bolus with 5% Albumin
To answer Question 1,
think about...How do we recognize intravascular volume
depletion? H d IV fl id di t ib t i t t l b d fl id?How do IV fluids distribute in total body fluid? What IV fluids can be used to optimize intravascular volume?Total Body Fluid60%
Intracellular
(IC)40% Extracellular (EC)75% Interstitial
25% Intravascular
9/4/2013
2Intravascular Space
Not exactly "extracellular" because there are
cells in this space (RBC's)The extracellular fluid in the intravascular
space is known as plasma and is about~3Lspace is known as plasma, and is about 3 L There's an additional ~ 2L of fluid in RBC's, making the total blood volume about 5L Intravascular fluid is analogous to the fluid in your car's gas tankIntravascular Volume
Depletion
Intravascular volume depletion due to:
Hemorrhagic shock (blood loss)
Septic shock (fluid redistribution)Septic shock (fluid redistribution)Cardiogenic shock (usually fluid overload)
Intravascular volume depletion causes
reduced myocardial function and subsequent organ hypoperfusionThe Starling Curve
COMeasures of Intravascular Volume
(e.g., CVP, LVEDP, MAP)Intravascular Volume
Depletion
S/S: SBP < 80, HR > 100, BUN:Cr > 10:1, Ļ
UO, dizziness, altered mental status
Perhaps the best sign of intravascular fluid depletion ih i ' flidblis the patient's response to a fluid bolusS/S usually occur when 15% (~750ml) lost
Need promptintravascularfluid replacement
through central line to maintain organ perfusionCrystalloids
Colloids
Question 2 (Fluid Resuscitation)
Which of the following IV fluids provides the
most intravascular volume replacement?A.NS 1000ml
B.D5W 1000ml
C.25% Albumin 200ml
D.5% Albumin 500ml
Distribution of IV Crystalloid
0.9% NaCl or LR
Sodium and chloride do not freely enter cells
Distributed evenly in extracellular space
75% Interstitial and 25% Intravascular = 250ml per L infused
D5WDextrose is metabolized to H2O and CO2
Water crosses any membrane, will distribute evenly in TBW60% intracellular, 40% extracellular...then 25% of EC
intravascular = 100ml per L infusedNS or LR recommended for fluid resuscitation
9/4/2013
3NS vs. LR
LR is an isotonic solution consisting mostly of Na and Cl, but also lactate, K , and CaLR and NS are equivalent with respect to fluid
resuscitationLactate is metabolized to bicarbonate and can
be useful for metabolic acidosis, however lactate metabolism is impaired during shock, thus it's an ineffective source of bicarbonate LR is historically preferred in trauma patients, but no evidence suggest superiority over NS for fluid resuscitationDistribution of IV Colloid
Colloids are too large to cross capillary membrane, so all volume infused remains in intravascular spacePRBC fills intravascular space andcarries O
2Pooled human plasma
e.g., 5% albumin, plasma protein fraction or plasmanateSemi-synthetic glucose polymer (Dextran)
Semi-synthetic hydroxyethyl starch (hetastarch)
For products above, 500ml infused = 500ml
intravascular volume replacementDistribution of IV Colloid
Unlike 5% albumin, 25% albumin causes fluid
redistribution100ml IV = 500ml intravascular volume replacement
Theoretical risk of cellular dehydration (so monitor for organ dysfunction) Possibly useful in patients with ascites or pleural effusions where fluid redistribution is goalCrystalloids vs. Colloids
Crystalloids (NS, LR) are recommended
Colloids "seem" better than crystalloids based on distribution propertiesNo evidence to demonstrate improved outcomes
Higher cost
Limited evidence, but colloids
used in certain situations...Consider albuminafter fluid resuscitation with
crystalloid (usually 4-6 L) has failed to achieve hemodynamic goals or when li i ll i ifi dli i f hclinically significant edema limits further administration of crystalloid e.g., pulmonary edema causing hypoxia Avoid hetastarch due to risk of kidney injury and coagulopathyConsider albuminin patients who have
required large volume of resuscitation fluidAND albumin < 2.5 g/dL
Limited evidence, but colloids
used in certain situations...Consider albumin (preferably 25%) + loop
diuretic if clinically significant edema AND albumin < 2.5 g/dL AND diuretics alone ineffective e.g., pulmonary edema or effusion causing respiratory failure9/4/2013
4How much fluid?
For fluid resuscitation, administer 500-1000ml
through a large-bore central catheter as fast as possible, then re-evaluate.Continue as long as S/S of volume depletion
improve (BP HR CVP UO etc)improve (BP, HR, CVP, UO, etc)For daily fluid maintenance, many use 1500
ml for first 20kg, then 20ml/kg thereafter (~ 2500ml/day) OR 20-40 ml/kg/dayAdjust based on I/O's, weight, estimated
insensible loss (e.g., skin when febrile)Maintenance IV Fluid
Goal is prevent dehydration and maintain
normal fluid and electrolyte balanceNot for intravascular volume depletion
Typical maintenance IV fluid is D5 0.45% NaCl + KCl 20 - 40me q/LqOmit KCl if elevated K or kidney failure
0.9% NaCl, LR, or colloids are NOT appropriate maintenance IV fluids
Evaluate IV fluids daily and d/c if taking sufficient fluid orally or through feeding tubeQuestion1: Answer
A 74yo female presents with a 3-day history of cough, fever to 102, and lethargy. Vitals/Labs: BP 72/40, HR115, CXR: LUL infiltrate, WBC 18,000, Hgb 12.5,
BUN/Cr 28/1.7 (baseline Cr 1.2), BG 82, UO 10ml/hr, wt72kg. PMH: CAD. After 500ml NS IV bolus, BP is
80/46. Which one of the followin
g is the most g appropriate treatment?A.Furosemide 40mg IV
B.0.9% NaCl 300ml/hr + Norepinephrine for SBP > 90C.1000ml fluid bolus with D5 / 0.9% NaCl
D.500ml fluid bolus with 0.9% NaCl
E.500ml fluid bolus with 5% Albumin
Which of the following IV fluids provides the
most intravascular volume replacement?Question 2: Answer
A.NS 1000ml~ 250ml
B.D5W 1000ml~ 100ml
C.25% Albumin 200ml~ 1000ml
D.5% Albumin 500ml~ 500ml
Question 3 (Osmolarity)
Calculate the osmolarity of D5W
MW = 180 gm/mol
74 /LA.74 mosm/L
B.154 mosm/L
C.278 mosm/L
D.550 mosm/L
Plasma Osmolarity
Plasma osmolarity (Posm) 275-290 mOsm/kg
Primary determinant of Posm is sodium salts
(hence 2 x 140 = 280 ~ Posm)Major changes in serum Na can result in
hiPchanges in Posm Changes in Posm cause fluid shifts across cell membranesIncreased Posm causes cellular dehydration
Decreased Posm causes cellular overhydration
(cell swelling)9/4/2013
5Changes in Posm
Posm maintained in normal range by thirst
and secretion of ADH from posterior pituitaryRapidchange in Posmor in serum Nacan cause
permanent neurologic damage in CNS cells Chronic / slow changes in serum Na orPosmareChronic / slow changes in serum Na or Posmare usually well tolerated and asymptomatic In chronic hyponatremia, cerebral swelling is avoided by osmotic adaptation (i.e., solutes move out of cerebral cells to lower the cellular osmolarity...this prevents the osmotic shift of water into the cerebral cells) Avoid the instinct to quickly correct chronic hyponatremiaOsmolarity of IV Fluids
Isotonic
No osmotic gradient, no fluid shift
Hypotonic IV Fluid
Cell overhydration can occur if < 150 mOsm/Ly
RBC swelling = hemolysis
Brain cell swelling = cerebral edema / herniation
Hypertonic IV Fluid
Cell dehydration / shrinkage
Calculate Osmolarity of IV Fluid
0.9% NaCl = 0.9 gm/100ml = 9gm/L
MW of NaCl = 58.5gm
Osmotic Coefficient NaCl = 0.93
9 gmL1mol58.5gm2 osmmol0.931000mosm1 osm
= 287 mOsm/L (isotonic)Question 3: Answer
Calculate the osmolarity of D5W
MW = 180 gm/mol
(Osmotic coefficient is not applicable)A.74 mosm/L
B.154 mosm/L
C.278 mosm/L (D5W is Isotonic)
D.550 mosm/L
50gx 1molx 1000mOsm= 278 mOsm/L
L 180g 1mol
Osmolarity: It gets easier
Osmolarity of D5W / NS = 278 + 286 = 564
Even though this is relatively hypertonic, it
has not been associated with clinicallyhas not been associated with clinically significant shifts of fluidQuestion 4 (Hypertonic Saline)
A 72yo female is admitted to the hospital with confusion and visual hallucinations that started 1 day prior. Her serum Na was 118 on admission. Wt is 60kg. Vital signs are stable. She started taking HCTZ 25mg daily 3 weeks prior. The medical resident calls the pharmacy and asks
hti th dd t ti fwhat is the recommended concentration of saline to administer?