fluid and electrolyte balances and imbalances
TRANSCRIPT
Fluid and Electrolytes, Balance and Disturbances
By: Ms.
katherina
#
Mechanism for fluid and
electrolyte movement
osmosis
diffusion
filtration
#
osmosis
#
diffusion
#
diffusion
#
filtration
#
Fluid and electrolyte balances
#
cations
#
sodium potassium
calcium magnesium
#
Electrolytes are measured
milliequivalent per litre of water
(mEq / L)
#
Equivalent refers to the chemical combining power of a substance or the power of cations to unite with anions to form molecules
#
sodium
#
most abundant cat ion in the extracellular fluid
sodium is regulated by
Salt intake Aldosterone
Urinary output
#
functionsMaintain balance of extracellular fluid,
thereby it controls the movements of the water between fluid compartments
Transmission of nerve impulses
Neuro muscular and myocardial impulse transmission
#
Normal concentration of sodium
135 to 145 mEq/L
#
POTASSIUM
#
Main intracellular cat ionHelps in maintaining fluid
balance of the intracellular fluidPotassium is regulated by
#
functionsRegulates neuromuscular excitability and
muscle contraction
Needed for glycogen formation and protein sunthesis
Correction of acid base imbalances. Potassium ion can be exchanged with
hydrogen ion (H+)
#
Normal concentration of potassium
3.5 to 5.3 mEq/L
#
CALCIUM
#
Calcium is the most abundant element in the body
Calcium is extracellular fluid Regulated by the action of Thyroid gland parathyroid
gland
#
Parathyroid hormone (PTH) controls the balance among bone calcium, gastrointestinal absorption and kidney excretion of calcium.
Thyrocalcitonin from the thyroid gland inhibits the release of calcium from bones, thus playing a minor role in determining serum calcium levels.
#
functionsMaintenance of cell membrane, its integrity
and structure
Conduction of nerve impulses in the skeletal muscle
Stimulation and depolarization and contraction of cardiac muscles
#
functionsAids in blood coagulation
Growth and formation of bones
Muscle relaxation
#
Normal concentration of calcium
4 to 5 mEq/L
#
MAGNESIUM
#
Magnesium is the second most important cat ion in the intracellular fluid
It has an inhibitory effect on skeletal muscles.
#
functionsPrecipitation of metabolic activities of
cells
Enzyme activity
Neuro chemical activity
Muscular excitability
#
Normal concentration of magnesium
1.5 to 2.4 mEq/L
#
anions
#
phosphate chloride
bicarbonate
#
PHOSPHATE
#
Phosphate is a buffer anion in extracellular and intracellular fluid
Phosphate absorption is through gastrointestinal tract in a range of 3 to 12 mg/100 ml
Calcium and phosphate are inversely proportional.
When one rises the other falls
#
Serum phosphate is regulated by
kidneys
Parathyroid hormone
#
Activated vitamin D
#
functions
Promotes normal neuromuscular action
Development and maintenance of bones and teeth
Participates in carbohydrate metabolism
Assist in acid base regulation
Maintains levels of ATP ( Adenosine Triphosphate) and thus energy levels
#
Normal concentration of phosphate
2.5 to 4.5 mEq/L
#
chloride
#
Chlorides are found in extracellular and intracellular fluids
The chloride ion balances the cations within the extracellular fluid
The ion exchange helps to maintain the electrical neutrality
#
Chloride is regulated through kidneys
The dietary intake of chloride and the amount excreted in urine are closely related
#
Normal concentration of chloride
100 to 106 mEq/L
#
bicarbonate
#
Bicarbonate is found in extracellular and intracellular fluids
It is a major chemical buffer in the body
Regulation is through kidneys
It is an essential component of the carbonic acid-bicarbonate buffering system essential to acid base balance
#
Normal arterial bicarbonate value
22 to 26 mEq/L
#
Normal venous bicarbonate value
24 to 30 mEq/L
In venous blood, bicarbonate is measured as
carbondioxide content
#
FLUID VOLUME DISTURBANCES
#
Fluid volume deficit
hypovolemia
#
Fluid Volume DeficitMild – 2% of body weight loss
Moderate – 5% of body weight loss
Severe – 8% or more of body weight loss
#
Pathophysiologyresults from loss of
body fluids and occurs more rapidly when coupled with decreased fluid intake
#
Clinical manifestations
Acute Weight loss
Decreased skin turgor
#
Concentrated urine
flattened neck veins
Postural hypotension
#
Weak, rapid, heart rate
Oliguria
Increased temperature
Decreased central venous pressure
#
Nursing Diagnosis Fluid volume Deficit r/t Insufficient intake, vomiting,
diarrhea, hemorrage, m/b dry mucous
membranes
#
Nursing management Restore fluids by oral or IV
Treat underlying cause Monitor I & O at least every 8
hours Daily weight Vital signs Skin turgor Urine concentration
#
Fluid volume excess
hypervolemia
#
Pathophysiology may be related
to fluid overload or diminished function of the homeostatic mechanisms responsible for regulating fluid balance
#
Contributing factors
#
Clinical manifestations
Edema
Distended neck veins
#
Tachycardia
Increased blood Pressure
#
Increased weight
crackles
#
Nursing Diagnosis Fluid volume excess r/t CHF, excess sodium intake,
renal failure
#
Nursing management
Preventing FVE
Detecting and Controlling FVE
Teaching patients about edema
#
Electrolyte Imbalances
#
SODIUM
#
SodiumNormal range – 135 to 145
mEq/L
Primary regulator of ECF volume (a loss or gain of sodium is usually accompanied by a loss or gain of water)
#
HYPONATREMIA
Sodium level less than 135 mEq/L
#
causesVomiting Diarrhea
#
Sweating Diuretics
#
Clinical manifestations
Poor skin turgor
Decreased saliva
production
Dry mucosa
Anorexiavomiting
#
Clinical manifestations
Orthostatic hypotension
Altered mental status
Nausea/ abdominal cramping
Confusion & lethargy
#
Nursing interventions Assess clinical manifestations
Monitor fluid intake and output, vital signs and lab data.
Encourage food and fluids high in Na
Limit water intake.
#
HYPERNATREMIA
Sodium level more than 145 mEq/L
#
CAUSESLoss of fluids
Water deprivation
Excessive salt intake
Conditions like Diabetes insipidus, heatstroke
#
Pathophysiology- Fluid deprivation in patients
who cannot perceive, respond to, or communicate their thirst
- Most often affects very old, very young, and cognitively impaired patients
#
Clinical manifestations- Thirst
- Sticky mucous membranes
- Flushed skin
- Postural hypotension
- Dry, swollen tongue
#
Nursing interventions Monitor intake and output
Monitor behavioural changes
Monitor lab findings
Encourage fluids
Monitor diet as ordered(salt restriction)
#
POTASSIUM
#
Normal serum potassium concentration is 3.5 to 5.5 mEq/L
Major Intracellular electrolyte and 98% of the body’s potassium is inside the cells
#
HYPOKALEMIA
Potassium level less than 3.5 mEq/L
#
CAUSESLoss of K+ in the form of
vomittings ,GI suction
poor K intake
diuretics
steroid administration
#
Clinical manifestations Muscle weakness Leg cramps Fatigue Lethargy Anorexia Nausea, vomitting Decreased bowel sounds Decreased bowel motility Cardiac dysrhythmias Depressed deep tendon reflex
#
Nursing interventions
Monitor heart rate and rhythmMonitor clients receiving
DIGITALISAdminister oral K+ as ordered
with food /fluidsAdminister IV K+ as
ordered ,flow rate not more than 10-20 meq/hr
Teach patients about potassium rich diet and to reduce potassium wastage
#
HYPERKALEMIA
Potassium level more than 5.5
mEq/L
#
Causes Decreased renal potassium
excretion as seen with renal failure and oliguria
High potassium intake Renal insufficiency
Shift of potassium out of the cell as seen in acidosis
#
Clinical manifestations
Skeletal muscle weakness/paralysis
ECG changes – such as peaked T waves, widened QRS complexes
Heart block
#
Nursing interventions
Monitor ECG changes – telemetry
Administer Calcium solutions to neutralize the potassium
Monitor muscle tone Give Kayexelate Give Insulin and D50W
#
CALCIUM
#
Normal serum calcium level is 4 to 5 mEq/L
More than 99% of the body’s calcium is located in the skeletal system
#
HYPOCALCEMIA
Calcium level less than 4 mEq/L
#
Causes- Vitamin D/Calcium
deficiency- Primary/surgical
hyperparathyroidism- Pancreatitis- Renal failure
#
Clinical Manifestations
Tetany and cramps in muscles of extremities
#
Trousseau’s sign – carpal spasms
#
Chvostek’s sign – cheek twitching
#
Seizures, mental changes
#
ECG shows prolonged QT intervals
#
Nursing interventions- IV/PO Calcium Carbonate or
Calcium Gluconate- Encourage increased dietary
intake of Calcium- Monitor neurlogical status- Establish seizure precautions
#
HYPERCALCEMIA
Calcium level more than 5 mEq/L
#
Causes- Hyperparathyroidism- Prolonged immobilization- Thiazide diuretics- Large doses of Vitamin A and D
#
Clinical manifestations
- Muscle weakness, nausea and vomiting
- Lethargy and confusion- Constipation- Cardiac Arrest
(high level)
#
Nursing interventions
- Eliminate Calcium from diet- Monitor neurological status- Increase fluids (IV or PO)- Calcitonin
#
MAGNESIUM
#
Normal serum magnesium level is 1.5 to 2.4 mEq/L
Thought to have a direct effect on peripheral arteries and arterioles
#
HYPOMAGNESEMIA
magnesium level less than 1.5 mEq/L
#
Causes- Chronic Alcoholism
- Diarrhea, or any disruption in small bowel function
#
- TPN
- Diabetic ketoacidosis
#
#
Clinical manifestations
- Neuromuscular irritability- Positive Chvostek’s and
Trousseau’s sign- EKG changes with prolonged
QRS, depressed ST segment, and cardiac dysrhythmias
- May occur with hypocalcemia and hypokalemia
#
• Starved – possible cause of hypomagnesemia
• Seizures• Tetany• Anorexia and arrhythmias• Rapid heart rate• Vomiting• Emotional lability• Deep tendon reflexes
increased
#
Nursing interventions
- IV/PO Magnesium replacement, including Magnesium Sulfate
- Give Calcium Gluconate if accompanied by hypocalcemia
- Monitor for dysphagia, give soft foods
- Measure vital signs closely
#
Foods high in Magnesium:
Green leafy vegetables
#
Nuts
Legumes
#
Seafood
Chocolate
#
HYPERMAGNESEMIA
magnesium level more than 2.4
mEq/L
#
Causes- Renal failure- Untreated diabetic
ketoacidosis- Excessive use of antacids
and laxatives
#
Clinical manifestations- Flushed face and skin warmth
- Mild hypotension
- Heart block and cardiac arrest
- Muscle weakness and even paralysis
#
RENAL• Reflexes decreased (plus
weakness and paralysis)• ECG changes (bradycardia and
hypotension)• Nausea and vomiting• Appearance flushed• Lethargy (plus drowsiness and coma)
#
Nursing interventions- Monitor Mg levels- Monitor respiratory rate- Monitor cardiac rhythm- Increase fluids- IV calcium for emergencies
#
PHOSPHORUS
#
Normal serum phosphorus level is 2.5 to 4.5 mg/100 ml
- Phosphate levels vary inversely to calcium levels
- High Calcium = Low Phosphate
#
HYPOPHOSPHOTEMIA
Phosphorus level less than 2.5 mEq/L
#
Causes- Most likely to occurs with
overzealous intake or administration of simple carbohydrates
- Severe protein-calorie malnutrition (anorexia or alcoholism)
#
Clinical manifestations
- Muscle weakness- Seizures and coma- Irritability- Fatigue- Confusion- Numbness
#
Nursing interventions- Prevention is the goal- IV Phosphorus for severe - Prevention of infection- Monitor phosphorus levels- Increase oral intake of
phosphorus rich foods
#
Foods rich in phosphorus
- Milk and milk products- Poultry- Whole grains- Organ meats- Nuts- Fish
#
HYPERPHOSPHOTEMIA
Phosphorus level more than 4.5
mEq/L
#
Causes- Renal failure
- Chemotherapy
- Hypoparathyroidism
- High phosphate intake
#
Clinical manifestations
- Tetany- Muscle weakness- Similar to Hypocalcemia because
of reciprocal relationship
#
Nursing interventions- Treat underlying cause
- Avoid phosphorus rich foods
#
#