After starting insulin therapy for DKA, which electrolyte shifts first and requires monitoring?

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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

After starting insulin therapy for DKA, which electrolyte shifts first and requires monitoring?

Explanation:
Potassium is the first electrolyte to shift during treatment of DKA because insulin activates the Na+/K+ ATPase pump, pushing potassium from the extracellular space into cells. As the insulin drip starts and acidosis begins to resolve, this cellular uptake of potassium causes a rapid fall in serum potassium levels. Meanwhile, the patient already has a total body potassium deficit from osmotic diuresis and vomiting, so the drop in serum potassium can reveal a substantial underlying depletion. That combination—insulin-driven shift plus existing total-body loss—creates the real risk of dangerous hypokalemia if potassium is not monitored and replaced appropriately. Because of this, potassium is the electrolyte you watch most closely early in DKA treatment, with labs and replacements guided by keeping serum potassium in a safe range (typically around 4–5 mEq/L).

Potassium is the first electrolyte to shift during treatment of DKA because insulin activates the Na+/K+ ATPase pump, pushing potassium from the extracellular space into cells. As the insulin drip starts and acidosis begins to resolve, this cellular uptake of potassium causes a rapid fall in serum potassium levels. Meanwhile, the patient already has a total body potassium deficit from osmotic diuresis and vomiting, so the drop in serum potassium can reveal a substantial underlying depletion. That combination—insulin-driven shift plus existing total-body loss—creates the real risk of dangerous hypokalemia if potassium is not monitored and replaced appropriately. Because of this, potassium is the electrolyte you watch most closely early in DKA treatment, with labs and replacements guided by keeping serum potassium in a safe range (typically around 4–5 mEq/L).

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