SIADH commonly presents with which electrolyte issue?

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Prepare for the Mark Klimek Electrolytes and Endocrine Test. Utilize flashcards, multiple choice questions, and detailed explanations for each query to enhance your understanding. Ace your exam!

Multiple Choice

SIADH commonly presents with which electrolyte issue?

Explanation:
SIADH causes dilutional hyponatremia: excess ADH makes the kidneys reabsorb water without retaining solutes, so the extracellular fluid becomes more diluted and serum sodium falls. This hyponatremia is the hallmark finding, often with euvolemia and inappropriately concentrated urine. The other options don’t fit the pattern—potassium isn’t the main issue in SIADH, hyperglycemia is not an electrolyte disturbance caused by ADH, and hypernatremia would arise from water loss rather than water retention.

SIADH causes dilutional hyponatremia: excess ADH makes the kidneys reabsorb water without retaining solutes, so the extracellular fluid becomes more diluted and serum sodium falls. This hyponatremia is the hallmark finding, often with euvolemia and inappropriately concentrated urine. The other options don’t fit the pattern—potassium isn’t the main issue in SIADH, hyperglycemia is not an electrolyte disturbance caused by ADH, and hypernatremia would arise from water loss rather than water retention.

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