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Zorluk: OrtaEndocrinology and Metabolism

A 22-year-old woman with type 1 diabetes mellitus is brought to the emergency department with severe abdominal pain, nausea, vomiting, and lethargy. She missed her last several doses of insulin due to a recent gastrointestinal illness. Vital signs show a blood pressure of 90/60 mm Hg, heart rate of 124/min, and respiratory rate of 28/min with deep, rapid breaths. Laboratory testing reveals:

* Blood glucose: 540 mg/dL
* Arterial blood gas pH: 7.18
* Serum bicarbonate: 10 mEq/L
* Serum potassium: 4.8 mEq/L
* Serum ketones: positive

Arrange the following acute management steps in the correct chronological sequence for this patient's presentation.

  1. 1Administer an aggressive intravenous fluid bolus of 0.9% normal saline
  2. 2Verify the serum potassium level is above 3.3 mEq/L
  3. 3Initiate a continuous intravenous regular insulin infusion
  4. 4Add 5% dextrose to the maintenance intravenous fluids
  5. 5Transition to a subcutaneous insulin regimen

Cevap

The correct chronological sequence is: 1) Administer an aggressive intravenous fluid bolus of 0.9% normal saline, 2) Verify the serum potassium level is above 3.3 mEq/L, 3) Initiate a continuous intravenous regular insulin infusion, 4) Add 5% dextrose to the maintenance intravenous fluids, 5) Transition to a subcutaneous insulin regimen.
The standard protocol for diabetic ketoacidosis (DKA) dictates prioritizing volume status and electrolyte safety. Aggressive fluid resuscitation is always the first step to counteract profound osmotic diuresis. Next, the serum potassium level must be verified because insulin shifts potassium into cells; insulin should be withheld if potassium is critically low. Once potassium is confirmed safe (>3.3 mEq/L), a continuous IV insulin infusion is started to halt lipolysis and resolve the acidosis. As blood glucose drops to around 200-250 mg/dL, 5% dextrose must be added to the IV fluids to prevent hypoglycemia, which allows the insulin infusion to continue running to fully clear the ketones. Finally, once the anion gap closes, the acidosis resolves, and the patient can eat, they are transitioned to a subcutaneous insulin regimen.

Adım Adım Çözüm

1
Administer an aggressive intravenous fluid bolus of 0.9% normal saline
Restores intravascular volume and tissue perfusion.
Patients with diabetic ketoacidosis have severe osmotic diuresis and are profoundly volume depleted. Fluid replacement is the most critical first step.
2
Verify the serum potassium level is above 3.3 mEq/L
Ensures it is safe to administer insulin.
Insulin drives potassium intracellularly. If given to a hypokalemic patient, it can cause fatal arrhythmias. Potassium replacement should occur concurrently once levels are verified.
3
Initiate a continuous intravenous regular insulin infusion
Halts ketogenesis and lowers serum glucose.
Insulin is required to suppress lipolysis, resolve ketonemia, and close the anion gap.
4
Add 5% dextrose to the maintenance intravenous fluids
Prevents iatrogenic hypoglycemia.
Blood glucose typically normalizes before the ketoacidosis resolves. Dextrose allows the insulin infusion to continue running to clear the ketones without dropping glucose to dangerously low levels.
5
Transition to a subcutaneous insulin regimen
Prepares the patient for maintenance therapy and discharge.
Once the anion gap closes and the patient can eat, IV insulin is overlapped with subcutaneous basal/bolus insulin before the infusion is discontinued.

Anahtar Kavram

The stepwise acute management of diabetic ketoacidosis prioritizes volume resuscitation and electrolyte stabilization before correcting hyperglycemia and ketonemia.
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Endocrinology and Metabolism

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