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Difficulty: HardPediatric Endocrine Disorders

A 1212-year-old adolescent is brought to the emergency triage in a lethargic state. The parents note a three-week history of unquenchable thirst, frequent nighttime urination, and a 4-kg4\text{-kg} weight loss. Clinical examination reveals deep, rapid respirations and a heart rate of 135/min135\text{/min}. Point-of-care testing shows a capillary blood glucose of 580 mg/dL580 \text{ mg/dL}. A venous blood gas demonstrates a pH of 7.087.08 and a calculated anion gap of 24 mEq/L24 \text{ mEq/L}. The patient is diagnosed with severe diabetic ketoacidosis (DKA). Arrange the following therapeutic interventions in the appropriate chronological order, reflecting the standard pediatric endocrine protocol to safely correct the metabolic derangement while minimizing the risk of cerebral edema.

  1. 1Administer a rapid intravenous bolus of 1010 to 20 mL/kg20 \text{ mL/kg} of 0.9%0.9\% sodium chloride.
  2. 2Initiate a continuous intravenous regular insulin infusion at a rate of 0.050.05 to 0.1 units/kg/hr0.1 \text{ units/kg/hr}.
  3. 3Incorporate 5%5\% dextrose into the intravenous fluid composition once serum glucose reaches 250250 to 300 mg/dL300 \text{ mg/dL}.
  4. 4Administer the first dose of subcutaneous basal insulin prior to discontinuing the intravenous insulin drip.

Answer

The correct chronological sequence is: 1) Intravenous bolus of 0.9% sodium chloride, 2) Continuous intravenous insulin infusion, 3) Addition of 5% dextrose to fluids, and 4) Administration of subcutaneous basal insulin.
The correct chronological order for pediatric DKA management relies on strict physiological priorities: volume resuscitation is the absolute first step to prevent shock. Continuous insulin follows to slowly correct acidosis. Dextrose is added to prevent hypoglycemia while insulin continues to clear ketones. Finally, a transition to subcutaneous insulin is made with an overlap period once the anion gap is fully closed.

Step-by-Step Solution

1
Assess the patient's hemodynamic status and recognize the immediate threat in severe DKA.
Identify that severe osmotic diuresis has caused critical volume depletion, making fluid resuscitation the first priority.
Administering insulin before restoring intravascular volume can cause cardiovascular collapse and increase the risk of cerebral edema.
2
Address the underlying ketogenesis and metabolic acidosis.
Start a continuous intravenous insulin infusion without a bolus.
A steady state of insulin suppresses lipolysis and ketone production. In pediatrics, a continuous drip is started after fluid expansion to ensure safe, gradual correction of serum osmolality.
3
Monitor serum glucose in relation to the anion gap during treatment.
Add dextrose to the maintenance fluids when glucose falls to the 250-300 mg/dL range.
Ketone clearance lags behind glucose clearance. Dextrose prevents hypoglycemia, allowing the insulin infusion to continue running until the acidosis (anion gap) fully resolves.
4
Determine the criteria for transitioning off intravenous therapy.
Administer subcutaneous insulin and overlap it with the intravenous drip for 1 to 2 hours once the anion gap closes.
Intravenous regular insulin has a very short half-life (minutes). Stopping it without overlapping subcutaneous insulin will result in rapid rebound ketoacidosis.

Key Concept

Pediatric Diabetic Ketoacidosis (DKA) Acute Management Protocol
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Topics

Pediatric Endocrine Disorders

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