Management of diabetic kitoacidosis

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Management of Diabetic Ketoacidosis (DKA)

Definition and Diagnostic Criteria

DKA is defined by three fundamental biochemical features (the "DKA triad"):

Hyperglycemia (blood glucose >250 mg/dL) or known diabetes
Ketonemia/ketonuria (urine ketones 2+ or more; serum beta-hydroxybutyrate ≥3.0 mmol/L)
Acidosis (arterial or venous pH <7.3; serum bicarbonate <15 mEq/L)

GOLDMAN-CECIL MEDICINE INTERNATIONAL EDITION, 2 VOLUME SET

Severity Classification

Parameter	Mild	Moderate	Severe
pH	7.25-7.30	7.00-7.24	<7.00
Bicarbonate (mEq/L)	15-18	10-14	<10
Mental status	Alert	Drowsy	Stupor/coma

Precipitating Factors

Most common:

Infections (pneumonia, UTI, sepsis)
Inadequate insulin / non-adherence
New-onset type 1 diabetes
Acute coronary syndrome

Other precipitants:

CVA, pulmonary embolism, acute pancreatitis
Drugs: corticosteroids, clozapine, olanzapine, cocaine, SGLT-2 inhibitors, sympathomimetics, lithium, thiazides
Endocrinopathies: Cushing syndrome, thyrotoxicosis, acromegaly
Severe burns, hyperthermia/hypothermia

GOLDMAN-CECIL MEDICINE, Table 210-11

Pathophysiology (Brief)

Insulin deficiency + glucagon excess lead to:

Hyperglycemia - via increased hepatic gluconeogenesis and glycogenolysis, reduced peripheral glucose uptake
Osmotic diuresis - glucose exceeds renal threshold, pulling water + electrolytes (Na, K, Mg, Ca, PO4) into urine
Ketogenesis - insulin deficiency activates hormone-sensitive lipase; free fatty acids flood the liver and are oxidized to acetoacetate and beta-hydroxybutyrate
Acidosis - ketone body accumulation exhausts bicarbonate buffers; Kussmaul breathing is the respiratory compensation

Average fluid/electrolyte deficits in severe DKA: water 70-120 mL/kg, sodium 8-10 mEq/kg, potassium 5-7 mEq/kg, phosphorus ~3 mEq/kg.

ROSEN's Emergency Medicine, Table 115.3

Initial Assessment

History: polyuria, polydipsia, polyphagia, weakness, nausea, vomiting, abdominal pain (~50% of cases, especially children), weight loss

Examination: tachypnea with Kussmaul breathing, tachycardia, hypotension or orthostatic changes, dry mucous membranes, fruity/acetone breath odor, reduced level of consciousness (correlates with hyperosmolality)

Investigations to order immediately:

Blood glucose, ABG or VBG, serum electrolytes, BUN/creatinine, phosphate, magnesium
CBC, urinalysis with urine ketones, urine/blood culture if infection suspected
ECG (to assess K+ effect and rule out ACS precipitant)
Chest X-ray
Serum/capillary beta-hydroxybutyrate (preferred over nitroprusside-based urine ketone test, which misses BHB)

Important: Initial serum K+ may appear normal or elevated due to acidosis-driven extracellular shift, masking profound total body depletion. WBC elevation can occur from the acidosis itself, not necessarily infection. Serum amylase may be elevated from non-pancreatic sources, mimicking pancreatitis.

Management: The Five Pillars

1. Airway / Resuscitation

Avoid intubation if at all possible - patients have a strong compensatory respiratory drive and matching ventilator settings is difficult
If comatose + vomiting: intubate and maintain hyperventilation to prevent worsening acidosis
Hypovolemic shock: aggressive isotonic crystalloid resuscitation before vasopressors; consider bedside ultrasound to exclude other causes of hypotension (sepsis, MI)

ROSEN's Emergency Medicine

2. Intravenous Fluid Replacement

This is the first and most important step.

Adults:

If in shock: give NS (0.9% NaCl) as rapidly as possible until systolic BP >80 mmHg
Without shock: 1 L NS over the first hour, then 2 L total in the first 1-3 hours
Switch to 0.45% NaCl for slower ongoing replacement once hemodynamics stabilize
When glucose falls to 250 mg/dL: add 10% dextrose to the infusion to allow continued insulin infusion without hypoglycemia

Children:

Initial bolus: 20 mL/kg 0.9% NS, repeat until perfusion improves
Adjust rate to achieve urine output 1-2 mL/kg/hr

Fluid choice note: Large volumes of normal saline can worsen hyperchloremic metabolic acidosis. Balanced crystalloids (e.g., Plasmalyte) may normalize physiology more rapidly in some patients.

GOLDMAN-CECIL MEDICINE; ROSEN's Emergency Medicine

3. Insulin Therapy

Do not start insulin if K+ <3.5 mEq/L - insulin will drive K+ further into cells and can cause fatal hypokalemia. Replete potassium first.

Standard regimen:

Fixed-rate IV insulin infusion: 0.1 units/kg/hour (regular insulin)
Once blood glucose falls to 250 mg/dL AND ketones fall to <1.0 mmol/L: reduce to 0.05 units/kg/hour to prevent hypoglycemia and hypokalemia

Subcutaneous insulin:

A 2024 systematic review and meta-analysis (PMID 39090718) compared subcutaneous insulin to continuous IV insulin infusion in adult DKA and found comparable outcomes in mild-to-moderate DKA. This approach may be suitable in resource-limited or non-ICU settings.
A 2026 meta-analysis of RCTs (PMID 41208563) found that adding early subcutaneous basal insulin alongside IV infusion may reduce DKA recurrence and shorten transition time.

Transition to subcutaneous insulin:

Once patient can eat and drink, switch to SC insulin
Give SC insulin 1-2 hours before stopping IV infusion to prevent rebound ketosis

Insulin pump patients: Assume pump malfunction, disconnect pump, and start IV insulin infusion.

4. Electrolyte Replacement

Potassium (most critical)

Initial K+	Action
K+ ≥5.5 mEq/L	Do NOT give K+; start IV fluids + insulin; recheck q2h
K+ 3.5-5.5 mEq/L	Add 40 mEq/L KCl to IV fluids; insulin can be started
K+ <3.5 mEq/L	Hold insulin; replace K+ at 20-40 mEq/hr; recheck before restarting insulin

Rationale: insulin drives K+ intracellularly; virtually all DKA patients have total body K+ depletion despite initially normal/high serum levels.

Phosphate

Monitor levels; routine IV replacement not recommended
Replace if phosphate falls below 1.0 mg/dL or if patient develops respiratory or cardiac compromise from severe hypophosphatemia

Magnesium

Replace if hypomagnesemia documented

Bicarbonate

Not routinely recommended - risks paradoxical CNS acidosis, may worsen hypokalemia
Consider only if pH <7.0 and not responding to fluids + insulin
Goldman-Cecil: "Should be considered only if the patient is not responding to intravenous insulin and fluids and remains profoundly acidotic (e.g., pH <7.0)"

5. Monitoring and Targets

Initial monitoring (first 4-6 hours):

Blood glucose every 1 hour
Electrolytes (Na, K, Cl, HCO3), BUN, creatinine every 2-4 hours
Serum ketones / anion gap every 2-4 hours
Urine output hourly
Vital signs continuously

Treatment targets / resolution criteria:

Blood glucose <200-250 mg/dL
Serum bicarbonate ≥15 mEq/L
pH >7.3
Anion gap normalized (<12 mEq/L)
Beta-hydroxybutyrate <1.0 mmol/L

Anion gap = Na - (Cl + HCO3); normal 8-12 mEq/L. Use this to track resolution rather than urine ketones alone (which can stay falsely positive for hours due to acetoacetate accumulation after BHB converts with insulin).

Disposition

Admit to ICU/HDU: moderate-severe DKA, pH <7.2, K+ <3.0 or >5.5, altered mental status, hemodynamic instability, or unclear precipitant requiring workup

Outpatient/discharge may be considered (children): mild DKA (pH ≥7.35, HCO3 ≥20 mEq/L), tolerating oral fluids, reliable caregiver, resolution after ED treatment, no underlying precipitant requiring admission

Special Situations

DKA in Pregnancy

DKA in pregnancy occurs at lower glucose thresholds ("euglycemic DKA") and carries significant fetal risk. A 2025 systematic review (PMID 40447103) highlighted adverse fetal outcomes including intrauterine demise. Aggressive management, fetal monitoring, and early obstetric involvement are required.

SGLT-2 Inhibitor-Associated ("Euglycemic") DKA

Blood glucose may be only mildly elevated (often <250 mg/dL). High clinical suspicion is needed. SGLT-2 inhibitors are listed as a DKA precipitant in current guidelines.

Cerebral Edema (Pediatric)

Most feared complication in children; presents with headache, deteriorating consciousness 4-12 hours into treatment. Risk factors include rapid fluid shifts and very low PCO2 at presentation. Treat with mannitol 0.5-1 g/kg IV or hypertonic saline.

Common Pitfalls

Pitfall	Why it matters
Starting insulin before correcting K+	Can cause fatal hypokalemia
Using urine ketones to judge resolution	BHB not detected; misleadingly persistent
Stopping IV insulin too early	Rebound ketosis if SC insulin not overlapped
Bicarbonate use in mild-moderate DKA	Worsens cerebral acidosis; no mortality benefit
Attributing WBC elevation to infection	Acidosis alone can raise WBC; look for true infectious source
Ignoring abdominal pain in adults	In children usually resolves; in adults may indicate true surgical emergency

Key sources:

GOLDMAN-CECIL MEDICINE INTERNATIONAL EDITION, Vol. 2, Ch. 210 - Diabetes Mellitus
ROSEN's Emergency Medicine: Concepts and Clinical Practice, Ch. 115 - Diabetic Emergencies
Alnuaimi et al. (2024). Subcutaneous vs. continuous insulin infusion in DKA. BMC Endocr Disord, PMID 39090718
Thammakosol et al. (2026). Early SC basal insulin with IV insulin in DKA. Diabetes Obes Metab, PMID 41208563

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