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Difficulty: MediumMonitoring and Treatment Evaluation

A 2626-year-old woman with a history of type 1 diabetes mellitus presents to the emergency department complaining of diffuse abdominal pain, nausea, and persistent vomiting over the past 2424 hours. She recently had a urinary tract infection and missed her last two subcutaneous insulin doses. Vital signs reveal a blood pressure of 90/60 mm Hg90/60 \text{ mm Hg}, a heart rate of 122/min122 \text{/min}, and a respiratory rate of 28/min28 \text{/min} with deep, rapid breathing. Point-of-care testing shows a blood glucose level of 580 mg/dL580 \text{ mg/dL}. Arterial blood gas analysis demonstrates a pH of 7.127.12 and a serum bicarbonate of 10 mEq/L10 \text{ mEq/L}. Urinalysis is strongly positive for ketones. Arrange the following therapeutic and monitoring interventions in the most appropriate chronological sequence for managing this patient's condition.

  1. 1Initiate rapid volume expansion with intravenous 0.9%0.9\% sodium chloride.
  2. 2Verify that the serum potassium concentration is greater than 3.3 mEq/L3.3 \text{ mEq/L}.
  3. 3Commence a continuous intravenous infusion of regular insulin.
  4. 4Append 5%5\% dextrose to the running intravenous fluids.
  5. 5Overlap with and transition to a subcutaneous basal-bolus insulin regimen.

Answer

The correct chronological sequence for DKA management is: 1) Initiate rapid volume expansion with intravenous 0.9% sodium chloride, 2) Verify that the serum potassium concentration is greater than 3.3 mEq/L, 3) Commence a continuous intravenous infusion of regular insulin, 4) Append 5% dextrose to the running intravenous fluids, 5) Overlap with and transition to a subcutaneous basal-bolus insulin regimen.
The correct sequence for managing diabetic ketoacidosis reflects a prioritized approach to reversing life-threatening derangements: volume depletion must be addressed first, followed by ensuring a safe potassium level before utilizing insulin to close the anion gap, and finally transitioning to long-term therapy once metabolic stability is achieved.

Step-by-Step Solution

1
Administer intravenous 0.9%0.9\% sodium chloride.
Restores intravascular volume and tissue perfusion.
Corrects profound dehydration caused by osmotic diuresis and improves the renal clearance of glucose and ketones.
2
Evaluate serum potassium before giving insulin.
Confirms potassium is greater than 3.3 mEq/L3.3 \text{ mEq/L}.
Prevents insulin-induced severe hypokalemia and secondary life-threatening cardiac arrhythmias.
3
Start continuous intravenous regular insulin.
Suppresses lipolysis and hepatic gluconeogenesis.
Necessary to stop ketone production and normalize the anion gap.
4
Add 5%5\% dextrose to intravenous fluids when glucose hits 200 mg/dL200 \text{ mg/dL}.
Maintains euglycemia while insulin infusion continues.
The anion gap usually takes longer to close than the time required for glucose to normalize; ongoing insulin is needed to clear ketones.
5
Administer subcutaneous insulin before stopping the intravenous drip.
Ensures continuous basal insulin coverage.
Rebound ketoacidosis can occur rapidly if the intravenous drip is stopped without a 11 to 22 hour subcutaneous overlap.

Key Concept

Stepwise therapeutic monitoring and protocol-driven intervention in Diabetic Ketoacidosis (DKA)
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Topics

Monitoring and Treatment Evaluation

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