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Zorluk: KolayEndocrinology and Metabolism

A 24-year-old woman with type 1 diabetes mellitus presents to the emergency department with abdominal pain, nausea, vomiting, and deep, rapid breathing. Vital signs show a heart rate of 118 /min118\text{ /min} and blood pressure of 90/60 mmHg90/60\text{ mmHg}. Laboratory studies show a blood glucose of 480 mg/dL480 \text{ mg/dL}, an arterial pH of 7.15, positive serum ketones, and a serum potassium of 4.8 mEq/L4.8 \text{ mEq/L}. Arrange the following management steps in the most appropriate chronological sequence for this patient.

  1. 1Administer an initial bolus of 0.9% normal saline
  2. 2Initiate continuous intravenous regular insulin infusion
  3. 3Add 5% dextrose to the intravenous maintenance fluids
  4. 4Transition to subcutaneous basal and bolus insulin

Cevap

The correct sequence is: 1) Administer an initial bolus of 0.9% normal saline, 2) Initiate continuous intravenous regular insulin infusion, 3) Add 5% dextrose to the intravenous maintenance fluids, 4) Transition to subcutaneous basal and bolus insulin.
The standard protocol for Diabetic Ketoacidosis (DKA) management requires a strict sequence of interventions based on patient safety and pathophysiology. The absolute first priority is intravascular volume repletion with 0.9% normal saline because patients are severely dehydrated from osmotic diuresis. Once volume expansion has begun and serum potassium is confirmed to be safely elevated (> 3.3 mEq/L), an intravenous regular insulin infusion is started to stop lipolysis and ketogenesis. As the insulin works, blood glucose typically drops faster than the ketoacidosis resolves. To prevent hypoglycemia while continuing the insulin necessary to close the anion gap, 5% dextrose is added to the IV fluids once the blood glucose reaches approximately 200 to 250 mg/dL. Finally, after the anion gap is closed, the acidosis has resolved, and the patient can eat, they are safely transitioned to a subcutaneous insulin regimen.

Adım Adım Çözüm

1
Recognize the diagnosis of diabetic ketoacidosis (DKA) and the immediate need for volume expansion.
Identify 0.9% normal saline bolus as the priority first step.
Patients with DKA are profoundly dehydrated due to osmotic diuresis, and restoring intravascular volume takes precedence over all other interventions.
2
Evaluate the serum potassium level to determine the safety of insulin therapy.
Identify that since potassium is 4.8 mEq/L, an intravenous insulin infusion can be started safely.
Insulin drives potassium into cells. Starting insulin without checking potassium (or if K+ < 3.3 mEq/L) can cause fatal hypokalemia. With a normal level, insulin is the immediate next step.
3
Determine the management approach for when blood glucose improves but the anion gap remains open.
Identify adding 5% dextrose to IV fluids as the subsequent step.
Glucose usually normalizes faster than the anion gap closes. Dextrose prevents hypoglycemia while allowing the insulin infusion to continue suppressing ketogenesis.
4
Identify the criteria for transitioning off the insulin infusion.
Select transitioning to subcutaneous insulin as the final step.
Once the anion gap closes (DKA resolved) and the patient can eat, they are transitioned to a standard subcutaneous insulin regimen.

Anahtar Kavram

The standard sequence of treatment for Diabetic Ketoacidosis (DKA) prioritizes aggressive volume resuscitation, followed by intravenous insulin (dependent on safe potassium levels), adding dextrose when glucose reaches 200 mg/dL, and finally transitioning to subcutaneous insulin upon resolution.
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Endocrinology and Metabolism

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