Electrolytes Overview and Key Concepts

Understanding Electrolytes
  • Focus on key electrolyte disorders: hyperkalemia, hypokalemia, hypercalcemia, hypocalcemia, hypermagnesemia, hypomagnesemia, hypernatremia, hyponatremia.
Key Concepts of Kalimias
  • Kalimias: Refers to potassium levels in the body. Understand how these disorders manifest.
  • General Rule: Kalimias do the same as the prefix except for heart rate and urine output.
    • Hyperkalemia (high potassium): Symptoms will be elevated except for heart rate and urine output, which are decreased.
    • Hypokalemia (low potassium): Symptoms will be decreased except for heart rate and urine output, which are increased.
  • Examples of Symptoms:
    • Hyperkalemia:
    • Mental: Agitation, restlessness, irritability, aggression.
    • Heart: Low heart rate, peaked T waves.
    • Respiratory: Tachypnea.
    • Gastrointestinal: Increased bowel sounds (borborygmi).
    • Muscular: Increased spasticity, hyperreflexia.
    • Hypokalemia:
    • Mental: Lethargy.
    • Heart: Tachycardia (increased heart rate).
    • Respiratory: Bradypnea (slow breathing).
    • Gastrointestinal: Decreased bowel sounds, constipation, ileus.
    • Muscular: Flaccidity, hyporeflexia.
Calcium Disorders
  • Calcemias: Calcium levels in the body manifest oppositely:
    • Hypercalcemia (high calcium): Everything is low (e.g., bradycardia, bradypnea, muscle flaccidity).
    • Hypocalcemia (low calcium): Everything is high (e.g., agitation, irritability, muscle spasms).
    • Important Signs:
    • Chvostek's Sign: Facial spasm when tapping cheek (indicative of hypocalcemia).
    • Trousseau's Sign: Hand spasm when blood pressure cuff is inflated.
Magnesium Disorders
  • Magnesemias: Similar to calcium, magnesium disorders are opposite of the prefix:
    • Hypermagnesemia: Symptoms will be low (essentially similar pattern to hypercalcemia).
    • Hypomagnesemia: Symptoms will be high (similar pattern to hypocalcemia).
Sodium Imbalances
  • Hypernatremia: Associated with dehydration.
  • Hyponatremia: Associated with fluid overload.
    • Use acrostic to easily remember:
    • E for dehydration (hypernatremia).
    • O for overload (hyponatremia).
Treatment Overview for Potassium
  • Never Push Potassium IV: Can lead to cardiac arrest.
  • D5W with Regular Insulin: Drives potassium into the cells temporarily (quick fix).
  • Kayexalate: Exchanges sodium for potassium, removes excess potassium (slower, more permanent solution).
  • Importance of managing potassium: High potassium can lead to cardiac arrest, thus it is deemed the most dangerous electrolyte imbalance.
Symptoms and Treatment Overview
  • First Signs of Electrolyte Disorder: Numbness and tingling (paresthesia).
  • Universal Sign: Muscle weakness (paresis).
  • HESI/Board Exam Tips:
    • Focus on identifying symptoms and their associations correctly.
    • Use the rules for evaluating electrolyte imbalances mentioned above in exam scenarios.
Important Terms
  • Paresthesia: Numbness and tingling.
  • Paresis: Muscle weakness.