Management of DKA

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Management of Diabetic Ketoacidosis (DKA)

Diagnostic Criteria (ADA)

Before treatment, confirm the diagnosis. The three core features are:

Severity	Glucose (mg/dL)	Arterial/Venous pH	Bicarbonate (mmol/L)	Ketones	Anion Gap	Mental Status
Mild	>250	7.25-7.30	15-18	Positive	>10	Alert
Moderate	>250	7.0-7.24	10-15	Positive	>12	Alert/drowsy
Severe	>250	<7.0	<10	Positive	>12	Stupor/coma

Note: Euglycemic DKA (glucose ≤300 mg/dL) occurs in up to 18% of patients - its incidence is higher with SGLT2 inhibitor use.

Initial Workup

Serum glucose, electrolytes (Na, K, Cl, HCO3), BUN, creatinine, Mg, phosphate
Arterial or venous blood gas
Serum or urine ketones (preferably serum beta-hydroxybutyrate; nitroprusside strips miss beta-hydroxybutyrate)
CBC with differential (leukocytosis reflects ketosis, not necessarily infection - only bandemia suggests infection)
Urinalysis (look for UTI as precipitant)
ECG (to assess for hyper- or hypokalemia; also screen for MI as precipitant)
Chest X-ray if indicated

Corrected sodium: Add 1.6 mEq/L to measured sodium for every 100 mg/dL glucose above normal (to account for dilutional hyponatremia).

Corrected potassium for pH: Subtract 0.6 mEq/L from measured K for every 0.1-unit decrease in pH - this often unmasks severe hypokalemia behind a falsely normal or elevated serum K.

1. Fluid Resuscitation

Fluid deficits in severe DKA are profound: water ~70-100 mL/kg, sodium ~8-10 mEq/kg, potassium ~5-7 mEq/kg.

Start with 0.9% normal saline (NS) - even if osmolality is high, NS is relatively hypotonic compared to the patient's serum
Adults: 1-2 L NS over the first 1-3 hours
Patients in shock: aggressive resuscitation with isotonic crystalloid before vasopressors
Children: 20 mL/kg bolus in the first hour; titrate to urine output of 1-2 mL/kg/h
After initial resuscitation: switch to 0.45% NS (hypotonic phase)
When glucose drops to ≤250-300 mg/dL: add dextrose to the IV fluids (D5W/0.45% NS or 10% dextrose) to prevent hypoglycemia and allow continued insulin infusion to clear ketosis
Fluid resuscitation alone can lower glucose by ~18% via improved renal perfusion

2. Potassium Replacement

This is the most critical electrolyte issue. Serum K is often normal or high at presentation due to acidosis-driven intracellular shift - but total body K is always depleted. Once insulin is given and acidosis corrects, K drops precipitously.

Serum Potassium	Action
<3.3 mEq/L	Replace K first - do NOT start insulin until K ≥3.3 mEq/L
3.3-5.5 mEq/L	Add 20-40 mEq KCl per liter of IV fluid; start insulin
>5.5 mEq/L	Do not supplement K; begin insulin; recheck K frequently

The ADA recommends adding 20-40 mEq KCl to each liter of fluid when K <5.5 mEq/L, ensuring adequate urine output first.

3. Insulin Therapy

Insulin is essential - it stops ketogenesis, reduces glucagon effect, and corrects the anion gap.

Do NOT give insulin until K ≥3.3 mEq/L
IV bolus before infusion is no longer recommended
Preferred route: Continuous IV regular insulin infusion
Dose: 0.1 units/kg/hour (up to 5-10 units/hour)
IV is preferred in sicker patients - subcutaneous/IM absorption is erratic with poor perfusion
In mild DKA in selected patients: subcutaneous rapid-acting insulin analogues are safe and effective
When glucose reaches 250-300 mg/dL: reduce infusion to 0.05 units/kg/h and add dextrose; do NOT stop insulin until ketosis resolves
Transition to subcutaneous insulin: overlap SC dose with IV infusion by 1-2 hours before stopping IV insulin to prevent rebound ketosis; resume the patient's usual regimen at time of eating

4. Bicarbonate (Alkali Therapy)

Generally NOT recommended because:

Insulin and fluid alone will correct the acidosis by terminating ketoacid production
Bicarbonate can paradoxically worsen CNS pH, cause rebound alkalosis, and exacerbate hypokalemia
After treatment, anion gap acidosis converts to a hyperchloremic normal-gap acidosis (takes days to fully resolve)

Consider bicarbonate only if:

pH <7.0 (some sources say pH <7.1) with hemodynamic instability not responding to fluids and insulin

5. Phosphate

Routine IV phosphate replacement is not recommended - no significant evidence supports it. Replace with potassium phosphate if:

Serum phosphate <1.0 mg/dL AND
Patient develops profound muscle weakness or other clinical signs of severe hypophosphatemia

6. Magnesium

Magnesium deficiency is common in DKA. Hypomagnesemia can:

Worsen vomiting and mental status changes
Cause recalcitrant hypokalemia and hypocalcemia
Trigger fatal cardiac dysrhythmias

Correct with 1-2 g MgSO4 IV if serum Mg is low. Note that serum Mg levels may not reflect total body depletion.

7. Identify and Treat the Precipitant

Most common precipitants:

Infection (most common)
Inadequate insulin / non-adherence
New-onset type 1 diabetes
Acute coronary syndrome

Other causes: CVA, PE, pancreatitis, alcohol, corticosteroids, clozapine, olanzapine, cocaine, SGLT2 inhibitors, thyrotoxicosis, severe burns

In adults, abdominal pain more often indicates genuine abdominal pathology triggering DKA (unlike children, where it is usually idiopathic). Elevated amylase is usually of non-pancreatic origin; use lipase (>3x upper limit of normal) if pancreatitis is suspected.

8. Monitoring

Continuous monitoring with a flow sheet documenting:

Vital signs and mental status
Fluid input/output (target urine output 1-2 mL/kg/h)
Hourly capillary glucose
Electrolytes (Na, K, HCO3, anion gap) every 2-4 hours
Serum beta-hydroxybutyrate (preferred over nitroprusside urinary ketones, which can misleadingly worsen as beta-hydroxybutyrate converts to acetoacetate during treatment)

9. Special Populations

Children

General principles are the same but fluid dosing and insulin rates are more conservative due to concern for cerebral edema (incidence ~1%)
Cerebral edema risk is best predicted by degree of acidosis/uremia, not a specific fluid or insulin regimen
Treat suspected cerebral edema immediately with mannitol
Phenytoin is contraindicated for seizures in DKA (ineffective and suppresses insulin release)

Pregnancy

DKA can develop at lower glucose thresholds in pregnancy
Associated with 50-90% fetal mortality in severe cases due to placental hypoperfusion
Urgent management as above; monitor fetal heart rate

SGLT2 Inhibitor-Associated (Euglycemic) DKA

Add dextrose to IV fluids from the start of insulin therapy given lower glucose levels

Resolution Criteria

DKA is resolved when ALL of the following are met:

Blood glucose <200-250 mg/dL
Serum bicarbonate ≥15 mmol/L
Venous pH >7.3
Anion gap closed (or normalized)
Patient is able to eat

Prognosis

Pre-insulin era mortality: ~90%
Post-insulin introduction: ~50%
With modern management: <5% in adults (mortality is higher in elderly and in those with serious precipitating illness)
Pediatric HHS has higher fatal cerebral edema risk than adult DKA

Prevention (Sick-Day Rules)

Patient education is key:

Frequent glucose and ketone monitoring during illness
Never stop insulin during illness even if not eating
Small, frequent carbohydrate-containing fluids
Increase insulin doses for persistent hyperglycemia
Early contact with healthcare provider if ketones elevated

Sources: Goldman-Cecil Medicine, 26e (Chapter 210); Rosen's Emergency Medicine, 9e (Chapter 115); Comprehensive Clinical Nephrology, 7e; The Washington Manual of Medical Therapeutics

Recent evidence note: A 2024 ADA consensus report (PMID: 40032308) and a 2024 meta-analysis comparing subcutaneous vs IV insulin in DKA (PMID: 39090718) are consistent with the above framework. The meta-analysis supports subcutaneous insulin as a safe alternative to continuous infusion in uncomplicated adult DKA, though IV remains standard for moderate-severe cases.

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