Week 2 Fluid and Electrolytes Balance and Disturbance Flashcards
Movement of fluid from region of low solute to region of high across semipermeable membrane
Osmosis
Changes in water or volume related to water pressure
Hydrostatic Pressure
Movement of solutes from area of greater concentration to lesser concentration
Solutes in an intact vascular system are unable to move so diffusion normally should not be taking place
Diffusion
Movement of molecules against the concentration gradient and requires ATP as energy; process typically takes place at cellular level and is not involved in vascular volume changes
Active Transport
What is the nursing role in Fluid and Electrolyte balance
Help prevent, treat fluid and electrolyte disturbances
Understand physiology of F&E and Acid Base balances to anticipate, identify and respond to possible imbalances
The body is approximately how many % of fluid?
60%
Intracellular is ?
28 L
Extracellular fluid is how many?
14L
Extracellular fluid is broken into
- Intravascular-3-4 L
- Interstitial - 10-11 L
- Transcellular
Loss of ECF into space that does not contribute to equilibrium
Moves from intravascular to interstitial (Nonfunctional area between cells)
Third Spacing
Fluid is not available in the ICF or ECF
Does not contribute to equilibrium between ICF/ ECF
Third Spacing
Sign is decreased urine output Hallmark Sign
Third Spacing is seen in what kind of patients
- Decreased Potassium
- Decreased Fe
- Severe liver dz
- Alcholishm
- Hypothyroidism
- Malabsorption
- Burns
- Fluid Volume Overload
- Cancer
As volume deficits are detected by the kidneys they retain fluids in an effort to
Maintain CO and BP
Examples ascites, pleural effusion, pericardial effusion
Other compensatory signs of Third Spacing includes
Increased HR
Decreased BP
Decreased CVP
edema
Increased body wt
Imbalance
I & O’s
Low oncotic pressure exerted by plasma proteins is loss from?
IV space
Will result in leakage into the tissues
Name causes of fluid shifts
Albumin losses can occur in liver failure, liver dysfunction, and malnutrition
- Albumin losses can lead to fluid shifting into the peritoneum causing ascites
- Destruction of endothelial cells such in bowel surgery can cause fluid to move and be trapped in interstitial spaces
Fluid trapped in the lungs can lead to pulmonary edema
Active chemicals that carry positive and negative charges are
Electrolytes
cation= +
anions= -
Name the major cations
Sodium
Potassium
Calcium
Magnesium
Hydrogen Ions
Name the major anions
Chloride
Bicarbonate
Phosphate
Sulfate
Proteinate
Electrolyte concentrations differ in fluid compartments
True
Most in extracellular fluid includes
Na
Ci
Osmolality
HCo3
Most in intracellular fluids include
Potassium
Mg
Phosphates
Osmolality
How can we regulate fluid?
Osmosis
Diffusion
Filtration
Active Transport
Regulation of fluid is movement through capillary walls depends on what?
Direction of fluid movement depends on differences of hydrostatic, osmotic pressure
Average intake includes?
Metabolism-10%,250 ml
Foods-30%-750ml
Beverages-60%1500ml
Average output includes?
Feces- 4%, 100 ml
Sweat- 8%, 200ml
Insensible losses via skin and lungs- 28%, 700ml
Urine-1500ml, 60%
Gain is what?
Dietary intake of fluid, food or enteral feeding
Parenteral fluids
Routes of losses includes
Kidney : Urine output
Skin loss: Sensible/ insensible losses
-Lungs
- GI tract
As blood flows through the lungs what happens?
Co2 removed and 02 is added
What moves in Cells? Out of cells?
In cells are nutrients
Out of cells are metabolic wastes move out of cells
Kidneys clear
Plasma filtrate of nitrogenous wastes, ion excesses, etc
Name homeostatic mechanisms
Kidney
Heart and Blood vessels
Lung
Pituitary
Adrenal
Parathyroid
Baroreceptors
RAAS
ADH
Osmoreceptors
Natriuretic Peptides
Gerontologic Considerations includes
Reduced Homeostatic mechanisms, cardiac, renal, and resp. function
Decreased body fluid percentage
Medication use
Presence of concomitant conditions
Imbalance may be subtle
Fluid deficit may cause delirium
Decreased cardiac reserve
Reduced renal function
Dehydration is common
Age - related thinning of skin and loss of strength and elasticity
Gerontologic Considerations
Fluid Volume deficit is also known as
Hypovolemia
FVE is also known as
Hypervolemia
What is the relationship between Volume and osmolarity?
Decrease volume, increased Osmol
Decreased Osmol, Increased Volume
This may occur alone or in combination with other imbalances
FVD
Hypovolemia
-Loss of extracellular fluid exceeds intake ratio of water
- Electrolytes lost in same proportion as they exist in normal body fluids
Fluid Volume Deficit
- Hypovolemia
Not the same as FVD
- Loss of water alone, with increased serum sodium levels
Dehydration
-Abnormal Fluid Losses
- Decreased Intake
- Third Space Fluid Shifts
- Additional Causes
Causes of FVD
Manifestations of this include
- Rapid weight loss
- Decreased skin turgor
- Oliguria
- Concentrated urine
- Postural hypotension
- Rapid weak pulse
- Increased temperature
- Cool clammy skin due to vasoconstriction
- Lassitude
- Thirst
- Nausea
- Muscle weakness
- Cramps
Fluid Volume Deficit
Lab Data is showing
- Elevated BUN in relation to serum creatinine
- Increased HCT
- Increased serum and urine osmo and specific gravity
- Decreased urine Na
FVD
- Serum Electrolyte changes may occur
Medical Management of FVD
Provide fluids to meet body needs
—-Oral Fluids
—-Iv Solutions
FVD
Name the risk for Dehydration or Hypovolemia
- Diminished kidney function
- Elevated Temperature
- Highly concentrated tube feedings without enough supplemental water
- Young infant with diaper- Inaccurate assessment of output
- Diarrhea; diuretic overuse; diabetes
- Reduction in body water content; LOC, temp. and fluids= Tachycardia
–esp. in elderly - ADH production decreases
8.Thirst mechanism reduced - Increase in serum glucose
- Other conditions-N/V
- Not able to obtain fluid without help
Concept Map RAAS
Slide 29
Regulation of water intake and output
Slide 30
Labs are all increased
- HCT
- Serum Osmolality
- Protein level
- BUN
- Na
- Glucose
- Urine Specific Gravity
FVD or Dehydration
System Specific assessment
- Decreased moisture of mucous membranes
- Decrease in vascular volume= Tachycardia
- Decrease in postural BP= Syncope
- Decrease in neck vein (Flat)
- Decrease in UO
- Decrease BP too much= Shock
- Decrease in skin turgor- not valid in elderly
What is the normal Serum Osmol?
270-300 mOsm/ kg
Fluid replacement is determined based on how the fluid was loss
Crystalloids- Small molecules
Colloids- Large molecules
-This is due to fluid overload or diminished homeostatic mechanisms
- Risk factors: Heart failure, renal failure, cirrhosis
FVE
Contributing factors includes
- Excessive dietary sodium or sodium containing IV solutions
FVE
Manifestations include
- Edema
- Distended Neck Veins
- Abnormal lung sounds( crackles)
-Tachycardia
- Increased Blood pressure
- Pulse pressure and CVP
- Increased weight
- Increased urine output
- SOB
- Wheezing
FVE
Medical management includes
- Directed at cause
- Restriction of fluids and sodium
- Administration of diuretics
FVE
ANP/ ANF does what?
increases
- NaCl concentration
- Blood volume
- Blood Pressure
Then stretches increase of atria
Then increases ANP/ ANF release from cardiac cells in the atria
Then the atria ANP/ ANF
- Decreases suppression of RA system, angiotensin II
- Decreases Aldosterone release by adrenal cortex
- Decreases ADH release by posterior pituitary gland
- Increase GFR and increases Na excretion
With decrease ADH release it increases what?
Urine production and water excretion
Increase rate of urine production and water excretion does what?
Decreases
- Blood volume
- CVP
- CO
- Arterial Blood pressure
- Preload
- HR
System Specific Assessment of FVE includes
Increase Pulse - may be bounding
-Increase BP
- Increase confusion
- Increase in edema
- Increase wt more than 2ILBS/ 24 hr
- Increase in ascites
- Increase crackles in lungs
- Increase RR, dyspnea, orthopnea
- Increase neck veins JVD
- Increase R/F skin breakdown
FVE Labs will show what?
Decreased
- HCT
- Protein Level
- Na
- Urine SG
- Serum Osmolality
- BUN
- Glucose
This includes
- Postural hypotension
- Tachycardia
- Absence of JVP
- Decreased skin turgor
- Dry mucosa
- Supine Hypotension
- Oliguria
- Organ Failure
Volume Depletion