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Difficulty: MediumEndocrinology and Metabolism

A 2424-year-old man with a history of type 11 diabetes mellitus is brought to the emergency department due to altered mental status, nausea, and vomiting for the past 2424 hours. He recently had an upper respiratory tract infection. Vital signs are temperature 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), blood pressure 90/60 mm Hg90/60\text{ mm Hg}, pulse 120/min120\text{/min}, and respirations 26/min26\text{/min} with deep, rapid breaths. Laboratory studies show a serum glucose of 580 mg/dL580 \text{ mg/dL}, arterial pH of 7.127.12, serum bicarbonate of 10 mEq/L10 \text{ mEq/L}, and an anion gap of 22 mEq/L22 \text{ mEq/L}. Urine is strongly positive for ketones. Arrange the following interventions in the most appropriate chronological order for the acute management of this patient.

  1. 1Administer a bolus of intravenous 0.9%0.9\% normal saline
  2. 2Verify that the serum potassium level is greater than 3.3 mEq/L3.3 \text{ mEq/L}
  3. 3Initiate a continuous intravenous regular insulin infusion
  4. 4Add 5%5\% dextrose to the maintenance intravenous fluids when serum glucose reaches 200 mg/dL200 \text{ mg/dL}
  5. 5Transition to a subcutaneous insulin regimen and overlap with the intravenous infusion

Answer

The correct chronological sequence for Diabetic Ketoacidosis management is: 1) Administer intravenous normal saline, 2) Verify serum potassium levels, 3) Initiate intravenous regular insulin, 4) Add 5% dextrose when glucose drops below 200 mg/dL, and 5) Transition to subcutaneous insulin when the anion gap closes.
Optimal management of Diabetic Ketoacidosis follows a strict evidence-based sequence. Initial rapid fluid resuscitation with normal saline restores intravascular volume and renal perfusion. Next, potassium must be assessed (and replaced if necessary) before starting insulin to avoid life-threatening hypokalemia. Only after confirming a safe potassium level (>3.3 mEq/L> 3.3 \text{ mEq/L}) is an intravenous insulin drip started to correct the ketoacidosis. As glucose levels predictably fall below 200 mg/dL200 \text{ mg/dL}, dextrose is added to the fluids to prevent hypoglycemia while allowing continued insulin administration to successfully close the anion gap. Finally, once the anion gap normalizes and the patient can eat, they are safely transitioned to a subcutaneous insulin regimen.

Step-by-Step Solution

1
Restore intravascular volume
Administer a bolus of intravenous 0.9%0.9\% normal saline
Corrects profound dehydration and improves renal perfusion, which is necessary for the initial clearance of serum glucose and ketones.
2
Assess electrolyte safety
Verify serum potassium is >3.3 mEq/L> 3.3 \text{ mEq/L}
Insulin shifts potassium into cells. Administering insulin to a patient with severe hypokalemia can induce fatal cardiac arrhythmias.
3
Correct hyperglycemia and ketoacidosis
Start continuous intravenous regular insulin infusion
Insulin halts lipolysis and ketone body production, directly treating the underlying pathophysiology of Diabetic Ketoacidosis.
4
Prevent iatrogenic hypoglycemia
Add 5%5\% dextrose to intravenous fluids when glucose is <200 mg/dL< 200 \text{ mg/dL}
Insulin must be continued until the anion gap closes to resolve the ketoacidosis. Adding dextrose prevents hypoglycemia during this ongoing treatment.
5
Transition to maintenance therapy
Administer subcutaneous insulin and overlap with the intravenous infusion
Once Diabetic Ketoacidosis resolves (indicated by a closed anion gap) and the patient can eat, subcutaneous insulin is started to provide long-acting coverage before stopping the intravenous drip.

Key Concept

The stepwise management of Diabetic Ketoacidosis (DKA)
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Topics

Endocrinology and Metabolism

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