Nursing · NCLEX-RN

NCLEX Fluids and Electrolytes

Electrolyte imbalances (hyper/hypo for Na, K, Ca, Mg) with their classic signs and symptoms.

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Define hyponatremia
Serum sodium level below 135 mEq/L
What is the classic neurological sign of hyponatremia?
Confusion and altered mental status
Hyponatremia causes what type of headache?
Severe headache, often accompanied by nausea
A patient with acute severe hyponatremia may develop what life-threatening condition?
Seizures and cerebral edema
Define hypernatremia
Serum sodium level above 145 mEq/L
What is the primary symptom patients report with hypernatremia?
Intense thirst
Hypernatremia causes what oral finding?
Dry, sticky mucous membranes
Mental status changes in hypernatremia typically progress from confusion to what?
Lethargy, then coma and convulsions
Define hypokalemia
Serum potassium level below 3.5 mEq/L
What is a primary cardiac finding in hypokalemia on ECG?
Flattened T waves, U waves, ST depression
Hypokalemia commonly causes what type of cardiac arrhythmia?
Premature ventricular contractions (PVCs) and atrial fibrillation
What skeletal muscle symptom is classic for hypokalemia?
Weakness and muscle cramps
Hypokalemia causes which GI symptom?
Constipation and decreased bowel motility
Define hyperkalemia
Serum potassium level above 5.0 mEq/L
What is the classic ECG finding in hyperkalemia?
Peaked T waves

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