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Difficulty: MediumEndocrinology and Metabolism

A 22-year-old woman is brought to the emergency department due to progressive confusion, nausea, and severe abdominal pain over the past 24 hours. She was diagnosed with type 1 diabetes mellitus during childhood. Vital signs show a blood pressure of 90/60 mm Hg, pulse of 124/min, and deep, rapid respirations at 26/min. Laboratory evaluation reveals a serum glucose of 560 mg/dL, arterial pH of 7.12, serum bicarbonate of 10 mEq/L, and significantly elevated serum ketones. Arrange the following interventions in the most appropriate chronological order for the acute management of this patient's condition.

  1. 1Initiate a rapid intravenous infusion of 0.9% normal saline
  2. 2Determine the serum potassium concentration
  3. 3Commence a continuous intravenous infusion of regular insulin
  4. 4Incorporate 5% dextrose into the intravenous fluid regimen
  5. 5Administer subcutaneous basal insulin and subsequently halt the intravenous insulin

Answer

The correct sequence for the acute management of diabetic ketoacidosis is: fluid resuscitation, potassium assessment, intravenous insulin initiation, addition of dextrose to maintenance fluids, and finally the transition to subcutaneous insulin.
The standard of care for diabetic ketoacidosis follows a strict protocol to prevent fatal shifts in electrolytes and fluid. Volume expansion with isotonic saline is always the first priority. Potassium must then be evaluated because insulin therapy shifts potassium intracellularly; if the starting potassium is low (less than 3.3 mEq/L), insulin is withheld until potassium is replaced. Once potassium is confirmed safe, intravenous regular insulin is started to correct the acidosis. As glucose levels drop below 200-250 mg/dL, dextrose is added to the fluids to prevent hypoglycemia while allowing the insulin drip to continue until the anion gap closes. Finally, once the gap is closed and the patient is eating, subcutaneous insulin is administered with a brief overlap before stopping the IV drip.

Step-by-Step Solution

1
Address severe dehydration and shock
Administration of 0.9% normal saline
Patients with diabetic ketoacidosis have profound osmotic diuresis leading to total body water deficits of 3-6 liters. Isotonic fluids restore circulating volume and organ perfusion.
2
Evaluate electrolyte safety before medical therapy
Checking serum potassium levels
Insulin shifts potassium into cells. Administering insulin to a hypokalemic patient can trigger fatal cardiac arrhythmias.
3
Reverse the underlying metabolic derangement
Initiation of intravenous regular insulin
Insulin is required to stop ketone production and correct the acidosis. It is safely started only after potassium is verified.
4
Prevent iatrogenic complications during treatment
Adding 5% dextrose to intravenous fluids
Blood glucose typically normalizes faster than the anion gap. Dextrose prevents hypoglycemia while continuing the insulin necessary to clear ketones.
5
Transition to chronic management
Administration of subcutaneous insulin
Once the ketoacidosis is resolved (closed anion gap) and the patient can eat, basal subcutaneous insulin is given before stopping the IV drip to ensure continuous coverage.

Key Concept

Stepwise algorithmic management of Diabetic Ketoacidosis (DKA)
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Topics

Endocrinology and Metabolism

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