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Fluid and Electrolyte Balance
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Fluid and Electrolyte Balance
Fluid and Electrolyte Balance
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1
Question
What is fluid and electrolyte balance?
Answer
It is the process of regulating extracellular fluid volume, body fluid osmolality, and plasma concentrations of electrolytes.
2
Question
What compartments make up the extracellular fluid compartment?
Answer
Interstitial fluid (fluid between cells) and vascular fluid (fluid inside blood vessels).
3
Question
What are the two main components of fluid mentioned in the text?
Answer
Water and substances dissolved or suspended in it.
4
Question
What is the significance of fluid volume and osmolarity?
Answer
Fluid volume refers to the amount of fluid, and osmolarity refers to the degree of concentration, both essential for maintaining balance.
5
Question
What are electrolytes? Give examples.
Answer
Electrolytes are charged particles (ions) when dissolved in water, such as sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca).
6
Question
What must be matched to maintain optimal fluid and electrolyte balance?
Answer
Output must be matched by appropriate intake, which must be absorbed.
7
Question
List possible imbalances in fluid and electrolyte balance according to the scope described.
Answer
There can be too little fluid/electrolyte, too much fluid/electrolyte, or fluid/electrolytes misplaced in the body.
8
Question
Who are populations at greatest risk for fluid and electrolyte imbalance?
Answer
The very young (infants) and the very old are populations at greatest risk.
9
Question
Why are infants at greater risk for fluid and electrolyte imbalances?
Answer
Because they have a high metabolic rate, immature kidneys, more rapid respiratory rate, large fluid exchange rate, and a large relative surface area of skin and lungs.
10
Question
Why are elderly individuals at increased risk for fluid and electrolyte imbalance?
Answer
Because their thirst sensation is blunted, kidneys are less able to respond to ADH, and they have an impaired ability to conserve water.
11
Question
What historical symptoms or red flags suggest possible fluid and electrolyte imbalance?
Answer
Vomiting, diarrhea, organ failure (kidney, heart, liver), unexplained nausea, fatigue, dizziness, shortness of breath, muscle cramping, edema, and sudden changes in weight.
12
Question
Which diagnostic tests are used to evaluate fluid and electrolyte balance?
Answer
Direct measurement of serum levels such as Basic Metabolic Panel (including sodium, potassium, calcium, magnesium), and Electrocardiogram (ECG).
13
Question
What ECG changes can indicate hyperkalemia in a patient with electrolyte imbalance?
Answer
Hyperkalemia is indicated by a peaked T wave on the ECG.
14
Question
Which ECG features suggest hypokalemia?
Answer
Hypokalemia is characterized by a prominent U wave and a flattened T wave on the ECG.
15
Question
How does hypercalcemia affect the ECG?
Answer
Hypercalcemia causes shortened QT intervals on the ECG.
16
Question
What ECG change is associated with hypocalcemia?
Answer
Hypocalcemia leads to prolonged QT intervals on the ECG.
17
Question
What are examples of primary prevention strategies for fluid and electrolyte imbalances?
Answer
Primary prevention includes patient teaching, dietary measures, fluid management such as adequate intake during vomiting or diarrhea, and limiting intake when prone to edema.
18
Question
Is routine screening for fluid and electrolyte imbalance recommended for the general population?
Answer
No, screening for fluid and electrolyte imbalance is not routine for the general population; it may be performed as secondary prevention in disease management.
19
Question
What are common treatment strategies for fluid and electrolyte imbalances?
Answer
Treatment depends on the underlying condition and may include oral or intravenous water replacement, electrolyte supplements (potassium, sodium, magnesium, calcium), and pharmacotherapy such as diuretics.
20
Question
What daily interventions are important to manage fluid balance in patients?
Answer
Daily weight monitoring, fluid intake and output measurement, fluid safety, comfort measures such as oral hygiene, and patient teaching are important interventions.
21
Question
What are the causes of dehydration as a fluid volume deficit?
Answer
Causes include vomiting, diarrhea, profuse sweating (diaphoresis), burns or severe wounds, long-term NPO status, diuretic therapy, GI suctioning, difficulty swallowing, unconsciousness, and fever.
22
Question
What signs and assessments help identify dehydration in a patient?
Answer
Signs include weight loss, use of laxatives or diuretics, tachycardia, hypotension, decreased skin turgor or skin tenting, dry mucous membranes, fever, and low urine volume (less than 500 mL/day).
23
Question
What is hypervolemia and what are its common causes?
Answer
Hypervolemia is excess fluid in the extracellular fluid space often caused by kidney or heart failure, long-term corticosteroid therapy, excessive intake, inadequate excretion of fluids, water intoxication, or psychiatric disorders with polydipsia.
24
Question
What are clinical signs of fluid overload or hypervolemia?
Answer
Clinical signs include pitting edema, increased pulse and respiratory rate, crackles in lungs, shortness of breath, pale cool skin, headache, elevated blood pressure, and weight gain.
25
Question
What interventions are essential to manage and prevent fluid overload?
Answer
Interventions include ensuring patient safety, restoring normal fluid balance, providing supportive care, use of drug therapy and nutrition therapy, and careful monitoring to prevent future overload.
26
Question
What is the normal serum sodium range and what symptoms can indicate hypernatremia?
Answer
Normal serum sodium range is 135-145 mEq/L. Symptoms of hypernatremia (>145 mEq/L) include short attention span, agitation, confusion, lethargy, coma, muscle twitching, weakness, increased pulse, hypotension, and severe orthostatic hypotension.
27
Question
What are common causes of hypernatremia?
Answer
Common causes include kidney failure, corticosteroid use, Cushing syndrome, and excessive oral or IV sodium intake.
28
Question
How is hypernatremia typically managed or treated?
Answer
Management includes administering isotonic normal saline (0.9%) and dietary sodium restriction.
29
Question
Why is potassium balance critical for heart function?
Answer
Potassium influences electrical conduction in the heart; increased potassium levels can lead to heart block and ventricular fibrillation, which are dangerous abnormal heart rhythms.
30
Question
List the causes and main nursing priorities related to hyperkalemia.
Answer
Causes of hyperkalemia include overconsumption of potassium-containing foods or medications, rapid infusion of potassium IV solutions, kidney failure, and potassium-sparing diuretics. Nursing priorities involve assessing for cardiac complications, preventing falls, monitoring patient's therapy responses, and providing health education.