Management of Diabetic Ketoacidosis in Adults
Early recognition and treatment are critical. Management follows a structured sequence of fluid resuscitation, insulin therapy, electrolyte replacement, and correction of the precipitating cause [1][2].
Core Recommendation
Intravenous isotonic saline, continuous insulin infusion, and potassium monitoring are recommended as first‑line therapy for moderate to severe DKA [2]. Subcutaneous rapid‑acting insulin may be used in mild, uncomplicated cases in non‑critical settings [3].
Fluid Resuscitation Algorithm
- Initiate 0.9 % sodium chloride at 15–20 mL/kg over the first hour (≈1 L in most adults) [2].
- Continue with 0.45 % sodium chloride if corrected serum sodium exceeds 145 mmol/L; otherwise maintain 0.9 % sodium chloride [4].
- Add 5 % dextrose when blood glucose falls to 200–250 mg/dL to prevent hypoglycemia while continuing insulin [2].
Insulin Administration Framework
- Begin regular insulin infusion at 0.1 U/kg/h after the initial fluid bolus [2].
- Reduce the infusion to 0.05 U/kg/h when serum bicarbonate rises >15 mmol/L or the anion gap closes <12 mmol/L [4].
- Switch to subcutaneous rapid‑acting insulin when DKA resolves (pH > 7.3, bicarbonate > 15 mmol/L) and the patient is eating [3].
Electrolyte Management
- Check serum potassium before insulin; if <3.3 mmol/L, give 20–30 mmol potassium before insulin and hold insulin until potassium >3.3 mmol/L [2].
- Add 20–30 mmol potassium to each liter of IV fluid when serum potassium is 3.3–5.0 mmol/L and maintain 4–5 mmol/L during insulin therapy [4].
- Replace phosphate only if serum phosphate <1.0 mg/dL or symptomatic hypophosphatemia [2].
Treatment of Underlying Cause
- Identify precipitating factors (infection, insulin omission, myocardial infarction, etc.) within the first hour of admission [1].
- Initiate appropriate antimicrobial therapy, cardiac evaluation, or other targeted interventions promptly [4].
Monitoring and Targets
- Measure blood glucose hourly; maintain 150–200 mg/dL after dextrose addition [2].
- Monitor serum electrolytes, bicarbonate, and anion gap every 2–4 hours until resolution [4].
- Define DKA resolution as pH > 7.3, bicarbonate ≥ 15 mmol/L, anion gap ≤12 mmol/L, and glucose <200 mg/dL [2].
Common Pitfalls to Avoid
- Avoid delaying insulin until after fluid resuscitation; early insulin reduces ketogenesis [2].
- Prevent hypokalemia by correcting potassium before and during insulin infusion [2].
- Do not discontinue insulin before glucose falls below 200 mg/dL, as rebound ketoacidosis may occur [4].
Transition to Subcutaneous Insulin
- Administer a total daily dose of subcutaneous rapid‑acting insulin equal to 0.5 U/kg, divided into three doses, 1–2 hours before stopping the IV infusion [3].
- Provide basal insulin (e.g., glargine) 12 hours after the first subcutaneous dose if the patient is not eating [3].
Discharge Planning
- Ensure patient education on insulin administration, sick‑day rules, and glucose monitoring before discharge [1].
- Arrange follow‑up within 1 week for glucose and ketone monitoring [1].