A 10-year-old girl presents with progressive polyuria, polydipsia, unprovoked weight loss of 4 kg over three weeks, and persistent nausea with abdominal pain. On physical examination, she has deep, rapid Kussmaul respirations and a fruity breath odor. Laboratory investigations reveal blood glucose 420 mg/dL, venous pH 7.15, serum bicarbonate 11 mEq/L, and urine ketones 4+. What is the most critical initial management principle regarding potassium administration during insulin therapy for pediatric Diabetic Ketoacidosis (DKA)?

Answer and explanation

Correct answer: A. Add potassium to IV fluids once potassium is normal/low and urine output confirmed

  1. Step 1: In Diabetic Ketoacidosis, insulin deficiency and acidosis cause extracellular potassium shifts, masking total-body potassium depletion resulting from osmotic diuresis.
  2. Step 2: As insulin therapy drives potassium back into cells and rehydration restores renal perfusion, circulating serum potassium levels drop precipitously.
  3. Step 3: Guidelines dictate that potassium replacement (20-40 mEq/L of IV fluid) must be started once urine output is documented and serum potassium is < 5.5 mEq/L to prevent fatal hypokalemic cardiac arrhythmias.
Answer
Add potassium to IV fluids once potassium is normal/low and urine output confirmed.
Why not the others: 'Administer high-dose potassium bolus immediately' can cause fatal hyperkalemic arrest; 'Withhold all potassium for 24 hours' leads to severe, life-threatening hypokalemia; 'Administer potassium-binding resins' dangerously worsens severe total-body potassium deficiency.

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