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Zorluk: Çok zorEndocrinology and Metabolism

A 2424-year-old woman is brought to the emergency department due to progressive confusion, nausea, vomiting, and severe abdominal pain over the past 2424 hours. She has a history of type 1 diabetes mellitus but reports running out of her medications three days ago. Her temperature is 37.2∘C37.2^\circ\text{C} (99.0∘F99.0^\circ\text{F}), blood pressure is 90/60 mmHg90/60\text{ mmHg}, pulse is 128/min128\text{/min}, and respirations are 26/min26\text{/min} and deep. Mucous membranes are dry. Laboratory studies show:

Blood glucose: 650 mg/dL650\text{ mg/dL}
Serum sodium: 132 mEq/L132\text{ mEq/L}
Serum potassium: 3.1 mEq/L3.1\text{ mEq/L}
Serum chloride: 98 mEq/L98\text{ mEq/L}
Serum bicarbonate: 11 mEq/L11\text{ mEq/L}
Arterial pH: 7.157.15
Serum ketones: Positive

Arrange the following therapeutic interventions in the correct chronological order for the evidence-based management of this patient's condition.

  1. 1Administer rapid intravenous 0.9% sodium chloride
  2. 2Administer intravenous potassium chloride
  3. 3Initiate continuous intravenous regular insulin infusion
  4. 4Add 5% dextrose to the maintenance intravenous fluids
  5. 5Administer subcutaneous glargine insulin

Cevap

The correct sequence is: Administer rapid intravenous 0.9% sodium chloride, followed by intravenous potassium chloride, then initiate continuous intravenous regular insulin infusion, subsequently add 5% dextrose to the maintenance intravenous fluids, and finally administer subcutaneous glargine insulin.
The management of diabetic ketoacidosis follows a strict chronological algorithm to maximize survival and prevent iatrogenic complications. Intravenous fluids (0.9% NaCl) are universally the first step to restore intravascular volume and renal perfusion. Second, the clinician must interpret the serum potassium level; because this patient's potassium is < 3.3 mEq/L, intravenous potassium chloride MUST be administered before insulin to avoid lethal intracellular shifting. Third, once potassium is safely replenished, intravenous regular insulin is started to correct the metabolic acidosis. Fourth, as blood glucose falls below 200 mg/dL, 5% dextrose is added to the fluids to prevent hypoglycemia, allowing the insulin infusion to continue until the anion gap closes. Finally, subcutaneous basal insulin is administered with a 1-to-2-hour overlap before discontinuing the intravenous drip to prevent rebound DKA.

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1
Assess the patient's hemodynamic status and initiate fluid resuscitation.
Rapid intravenous 0.9% sodium chloride is administered.
The patient is hypotensive, tachycardic, and severely dehydrated. Volume expansion is the most critical initial step to restore organ perfusion and lower serum counterregulatory hormones.
2
Evaluate the serum potassium level prior to initiating insulin therapy.
Intravenous potassium chloride is administered while holding insulin.
The patient's initial potassium is 3.1 mEq/L (below the critical threshold of 3.3 mEq/L). Insulin drives potassium into cells. Giving insulin first would precipitate severe hypokalemia, potentially causing respiratory muscle paralysis or fatal cardiac arrhythmias.
3
Initiate insulin therapy once potassium levels are safe.
Continuous intravenous regular insulin infusion is started.
With potassium adequately replaced, insulin is required to stop lipolysis, halt ketogenesis, and close the anion gap.
4
Monitor blood glucose closely while the insulin drip continues to resolve the acidosis.
5% dextrose is added to the intravenous fluids.
Blood glucose typically normalizes before the anion gap closes. When glucose drops below 200 to 250 mg/dL, dextrose must be added to prevent hypoglycemia while allowing the insulin drip to run until the acidosis resolves.
5
Transition the patient from intravenous to subcutaneous insulin.
Subcutaneous glargine insulin is administered.
Once the anion gap is closed and the patient is ready to eat, subcutaneous insulin is given. The intravenous infusion is continued for 1 to 2 hours afterward to prevent rebound ketoacidosis during the subcutaneous insulin onset.

Anahtar Kavram

Diabetic Ketoacidosis (DKA) Stepwise Management and the Potassium Trap
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Konular

Endocrinology and Metabolism

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