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NCLEX-RN (1) Fundamentals > Electrolytes > Flashcards

Flashcards in Electrolytes Deck (55)
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☠️ What major complications can occur with fluid and electrolyte imbalances?

☠️ Severe fluid and electrolyte imbalances can cause life-threatening complications such as:

  • dysrhythmias
  • seizures
  • respiratory depression
  • coma


What main organ controls fluid and electrolyte balance?

The kidneys!


What are the normal lab values for each electrolyte?

  • Na
  • K
  • Cl
  • Mg
  • Ca
  • Phos

lab values are:

  • Na: 135 - 145
  • K: 3.5 - 5
  • Cl: 98 - 106
  • Mg: 1.6 - 2.6
  • Ca: 8.5 - 10.5
  • Phos: 2.6 - 4.5

​It's fine if you have slightly different values memorized.


Electrolytes are important for _____ and ______ function. 

Electrolytes are important for nerve and muscle function. 

Electrolytes affect all the systems!


Dehydration causes which electrolytes imbalances?

Dehydration causes electrolyte levels to increase especially:

  • hypernatremia and hyperkalemia
  • hypercalcemia, hypermagnesemia, and hyperphosphatemia can also occur

There is hemoconcentration of the electrolytes causing the levels to look elevated.


Sodium affects which types of cells?

Sodium affects brain and muscle cells:

Sodium imbalances cause "neuro" symptoms.


What are the early symptoms of a sodium imbalance?

Sodium imbalances:

  • Early symptoms: 
    • neuro: headache, confusion and restlessness
    • muscle: twitching and weakness


☠️ What are the late symptoms of a sodium imbalance?

Sodium imbalances:

  • Late symptoms: 
    • decreased level of consciousness
    • ↓ respirations
  • Very late symptoms: seizures and coma


Are there different symptoms for low and high sodium levels?

Low and high sodium imbalances basically have the same symptoms.


What is a characteristic symptom of hypernatremia?

feeling thirsty


Sodium has an inverse relationship with _________.

Sodium has an inverse relationship with potassium.

  • ↑ sodium = ↓ potassium
  • ↓ sodium = ↑ potassium

When the sodium level goes up, the potassium level goes down and vice versa.


Why does drinking too much water or receiving too much D5W (an IV fluid with a lot of water) cause hyponatremia?

Too many fluids cause the sodium level to become diluted and < 135.


What are tap water enemas and why do they cause hyponatremia?

Tap-water enemas are given in the colon to treat constipation

Too much water can get absorbed by the colon causing hyponatremia.


What is syndrome of inappropriate anti-diuretic hormone (SIADH) and why does it cause hyponatremia?

SIADH is a neuro and endocrine disorder that causes the body to release too much ADH.

ADH causes the body to hold onto fluids. This causes the FVO and the sodium level to become diluted and < 135. 


Why does NOT drinking enough water cause hypernatremia?


NOT drinking enough water causes the sodium in the blood to become concentrated and > 145.


Why would a client not drink enough water and then get hypernatremia as a result?


Clients don't drink enough water and get hypernatremia because:

  • dementia: can't remember to drink
  • immobility: can't get up to get a drink of water
  • elderly: older age decreases the sense of thirst


Why does too much salt intake cause hypernatremia?


Too much salt intake from diet or IV fluids makes the sodium in the blood concentrated and >145.


Why do tube feedings, when not given with additional water, cause hypernatremia?


Tube feedings have sodium in it and without water, the sodium gets concentrated and > 145.


What is diabetes insipidus (DI) and why does it cause hypernatremia?


DI is a neuro and endocrine disorder that prevents the body from making ADH.

Decreased ADH causes the body to urinate a lot. This causes FVD and the sodium level to become concentrated and >145. 



Potassium affects which types of cells?

Potassium affects cardiac cells

Potassium imbalances cause dysrhythmias.


Potassium has an inverse relationship with _____.

Potassium has an inverse relationship with sodium.

  • ↑ potassium = ↓ sodium

  • ↓ potassium = ↑ sodium

    When the potassium level goes up, the sodium level goes down and vice versa.


☠️ What are the early and late symptoms of a potassium imbalance?

☠️Potassium imbalances:

  • Early symptoms:
    • muscle issues like cramps, paresthesia or weakness
  • Late symptoms:
    • dysrhythmias
    • respiratory muscle weakness and difficulty breathing


Which common cardiac medications should the potassium level be checked before giving?

Check potassium level first before giving:

  • diuretics: diuretics cause the client to urinate; potassium can also be excreted
  • digoxin: low potassium levels can cause digoxin toxicity
  • ACE inhibitors: potassium can be increased with these meds because the client is losing sodium (↓Na = ↑K)



When potassium levels are low, it can be given as a medication to the client. How should potassium NEVER be given?

Potassium is NEVER given IV push. 

The potassium can be quickly increased in the blood and the client can get a cardiac dysrhythmia and die

~Death row inmates are given potassium IV push to stop the heart.~


Why does diarrhea and vomiting cause hypokalemia?

When there is diarrhea or vomiting the client loses potassium because potassium is in body fluids


Why do potassium-wasting diuretics cause hypokalemia?

Potassium-wasting diuretics are a type of medication that causes the client to excrete fluids and potassium. 


Why does alkalosis cause hypokalemia?

Alkalosis causes hypokalemia.

The decreased acid compensates by leaving cells and entering the blood. This puts potassium back into the cells and out of the blood.

This process lowers the serum potassium level.


What are the main causes of hyperkalemia?

Main causes of hyperkalemia:

  • kidney failure: can't excrete potassium
  • Addison's disease: there aren't enough steroids to hold onto sodium and water. This increases the potassium level
  • too many potassium supplements
  • acidosis: increased acid compensates by entering cells and releasing potassium into the blood


Why does acidosis cause hyperkalemia?

Acidosis causes hyperkalemia.

The increased acid compensates by entering cells and leaving the blood. This takes potassium out of the cell and into the blood.

This process increases the serum potassium level.


Why does Addison's disease cause hyperkalemia?

Addison's is when there aren't enough steroids to hold onto sodium and water. The client loses sodium and the inverse relationship increases the potassium level.