DKA treatment
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"diabetic ketoacidosis" AND management
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Diabetic Ketoacidosis (DKA) - Treatment
Diagnostic Criteria (Quick Recap)
| Parameter | Value |
|---|---|
| Plasma glucose | ≥250 mg/dL (euglycemic DKA <200 possible with SGLT2i) |
| Serum ketones | Positive β-hydroxybutyrate or urine ketones |
| Anion gap metabolic acidosis | Positive |
| pH | <7.30 (severe: <6.9) |
| Bicarbonate | <18 mEq/L (severe: <5 mEq/L) |
Obtain: BMP (K+, glucose, anion gap), ABG, CBC, urinalysis, ECG (to evaluate hyperkalemia/hypokalemia), and a focused search for a precipitating infection.
The Three Pillars of Treatment
1. IV Fluid Replacement
The typical fluid deficit is 7-9% of body weight (roughly 3-5 L in adults). Hypotension implies >10% fluid loss.
Step 1 - Volume resuscitation:
- Normal saline (0.9%) 1-2 L IV over 1-3 hours (adults); 20 mL/kg bolus in children
- If in hypovolemic shock: give isotonic crystalloid as rapidly as possible until hemodynamically stable
Step 2 - Replenish total-body water deficit:
- Switch to 0.45% saline at 150-500 mL/h (use 0.9% saline if hyponatremic)
- Adjust rate based on blood pressure and urine output
- Do not correct osmolality faster than 3 mOsm/kg/h
- Aim for positive fluid balance over 12-24 hours
When glucose falls to ≤250-300 mg/dL: switch IV fluid to D5W/0.45% NS to allow continued insulin infusion without causing hypoglycemia.
Recent evidence update (PMID 38925619): A 2024 meta-analysis found that balanced electrolyte solutions (e.g., Lactated Ringer's or Plasmalyte) result in faster DKA resolution compared to 0.9% NS in adults. The use of NS may worsen hyperchloremic acidosis and complicate anion gap monitoring.
2. Insulin Therapy
Do NOT start insulin until K⁺ ≥ 3.5 mEq/L - insulin drives K⁺ into cells and can cause life-threatening hypokalemia.
Standard IV protocol:
- Bolus: 0.1 units/kg regular insulin IV (some protocols omit the bolus)
- Infusion: 0.1 units/kg/h regular insulin (e.g., 100 units regular insulin in 100 mL NS = 10 units/h for a 100 kg patient)
- Target glucose drop: 50-75 mg/dL/h
- Do not exceed 100 mg/dL/h drop (risk of osmotic encephalopathy)
Once glucose <250 mg/dL:
- Reduce insulin infusion to 0.05 units/kg/h
- Start D5W-containing fluid concurrently (two-bag approach - shown to reduce treatment duration)
Continue insulin infusion until:
- HCO₃⁻ >15 mEq/L
- Clinical improvement
- Anion gap closed
Transitioning to subcutaneous insulin:
- Administer SC basal insulin 2 hours BEFORE stopping the IV infusion to prevent rebound ketoacidosis
Recent evidence update (PMID 39090718, 41208563): Meta-analyses show subcutaneous insulin protocols may be a safe alternative to continuous IV insulin infusion in mild-to-moderate DKA in non-ICU settings. Early overlap of SC basal insulin with IV infusion reduces rebound ketosis.
3. Potassium Replacement
Potassium is a critical safety issue. Initial serum K⁺ is often falsely normal or high due to acidosis-driven extracellular shift - but total body K⁺ is depleted by several hundred mEq.
| Serum K⁺ | Action |
|---|---|
| <3.3 mEq/L | Hold insulin - replace K⁺ aggressively first (20-40 mEq/h) |
| 3.3-5.5 mEq/L | Add 20-40 mEq KCl per liter of IV fluid |
| >5.5 mEq/L | Do not supplement; recheck every 2 hours |
Rule of thumb: subtract 0.6 mEq/L from reported K⁺ for every 0.1 decrease in pH below normal to estimate true K⁺.
Additional Therapies
Bicarbonate
Not routinely recommended. Consider only if:
- Shock or coma
- pH <6.9
- HCO₃⁻ <5 mEq/L
- Severe cardiac/respiratory dysfunction
- Severe hyperkalemia
Dose: 50-100 mEq in 1 L of 0.45% NS over 30-60 min; always add 10 mEq KCl to prevent hypokalemia.
Phosphate
Generally not required for routine repletion. May give K-Phos in IV fluids if the patient is not eating.
Magnesium
Deficits are common - check levels. Correct with 1-2 g MgSO₄ IV. Give 10-20 mEq magnesium sulfate if ventricular arrhythmias occur.
Monitoring
| Parameter | Frequency |
|---|---|
| Blood glucose | Hourly |
| Electrolytes (BMP) | Every 2-4 hours |
| ABG | As needed for severe acidosis/hypoxia |
| Serum β-hydroxybutyrate | Serial measurements (best indicator of ketosis resolution) |
| Urine output | Continuous |
Key monitoring notes:
- Serum sodium should rise as glucose normalizes - failure to do so suggests overhydration
- Anion gap closure alone is unreliable as a recovery marker because hyperchloremia (from NS) can close the gap before bicarbonate normalizes
- Normalization of serum HCO₃⁻ is the most reliable index of metabolic recovery
- Telemetry recommended for electrolyte arrhythmia monitoring
Setting and Disposition
- Severe DKA: ICU with continuous monitoring
- Mild-moderate DKA: Non-ICU with close monitoring acceptable; subcutaneous insulin protocols may be used
- Outpatient (pediatric only): Consider if pH ≥7.35, HCO₃⁻ ≥20, tolerating oral fluids, no underlying precipitant requiring admission
Identify and Treat the Precipitant
Common triggers: infection, missed insulin doses, new diabetes diagnosis, MI, surgery. DKA does not typically cause fever - a febrile patient should be evaluated for infection. Leukocytosis in DKA reflects ketosis severity, not infection; only bandemia (left shift) reliably indicates infection.
Sources: Washington Manual of Medical Therapeutics (Table 23-2); Rosen's Emergency Medicine, Box 115.1
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