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Zorluk: OrtaEndocrinology and Metabolism

A 24-year-old man with type 1 diabetes mellitus is brought to the emergency department due to altered mental status, generalized weakness, and abdominal pain for the past 24 hours. He recently had an upper respiratory infection and stopped taking his insulin due to poor oral intake. His blood pressure is 90/60 mm Hg, heart rate is 118/min, and respiratory rate is 24/min with deep, rapid breaths. Laboratory results show a blood glucose of 580 mg/dL, arterial pH of 7.12, serum bicarbonate of 10 mEq/L, and strongly positive serum ketones. Arrange the following management steps in the most appropriate chronological order for the optimal acute management of this patient's condition.

  1. 1Administer a rapid intravenous bolus of 0.9% normal saline.
  2. 2Evaluate serum potassium concentration to ensure it is above 3.3 mEq/L.
  3. 3Initiate a continuous intravenous infusion of regular insulin.
  4. 4Add 5% dextrose to the intravenous fluids once blood glucose falls to 200 mg/dL.
  5. 5Transition to subcutaneous insulin once the anion gap normalizes and the patient can eat.

Cevap

The correct sequence for DKA management is: 1) Administer IV normal saline, 2) Check potassium levels, 3) Start IV regular insulin, 4) Add dextrose to IV fluids when glucose reaches 200 mg/dL, and 5) Transition to subcutaneous insulin when the anion gap closes.
The acute management of diabetic ketoacidosis (DKA) must follow a strict, protocolized sequence to resolve the metabolic derangements safely. The most immediate life threat is hypovolemia from massive osmotic diuresis, making aggressive fluid resuscitation with normal saline the paramount first step. The second most critical step is evaluating serum potassium. Because patients have a total-body potassium deficit (despite potentially normal or high initial serum levels due to acidosis-induced extracellular shifts), insulin must NOT be given if serum potassium is < 3.3 mEq/L, as insulin will rapidly drive potassium into cells and cause lethal arrhythmias. Once safe potassium levels are confirmed, an intravenous insulin infusion is started to halt lipolysis and clear ketones. As treatment progresses, blood glucose typically falls faster than ketones are cleared. Therefore, when glucose reaches 200 mg/dL, 5% dextrose must be added to the IV fluids to prevent hypoglycemia while the insulin infusion is continued to close the anion gap. Finally, once the anion gap normalizes and the patient can eat, they are transitioned to subcutaneous insulin.

Adım Adım Çözüm

1
Restore intravascular volume.
Administer 0.9% normal saline bolus.
Patients with DKA have profound total-body water deficits due to osmotic diuresis; correcting volume depletion improves tissue perfusion and renal clearance of glucose.
2
Prevent severe hypokalemia.
Check potassium levels before initiating insulin.
Insulin therapy drives potassium into cells. If a patient is already hypokalemic (potassium < 3.3 mEq/L), insulin administration can precipitate life-threatening cardiac arrhythmias.
3
Halt ketogenesis and correct acidosis.
Begin continuous IV insulin infusion.
Insulin directly suppresses lipolysis and ketone production, which treats the underlying pathophysiology and begins to close the anion gap.
4
Prevent treatment-induced hypoglycemia.
Add 5% dextrose to IV fluids when blood glucose reaches 200 mg/dL.
Because acidosis takes longer to clear than hyperglycemia, insulin must be continued even after glucose normalizes. Adding dextrose allows insulin continuation without causing hypoglycemia.
5
Transition to maintenance therapy.
Initiate subcutaneous insulin.
Once the anion gap has closed, acidosis is resolved, and the patient is awake and able to eat, they can be safely transitioned to a subcutaneous insulin regimen with a brief overlap.

Anahtar Kavram

Sequential acute management of Diabetic Ketoacidosis (DKA)
Tahmini Süre:1m 30s
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Konular

Endocrinology and Metabolism

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