ER Basics for Rookies

Diabetic ketoacidosis (DKA) is one of the most common life-threatening endocrine emergencies in children. For rookies, the danger isn’t missing the diagnosis — it’s mismanaging fluids or insulin and causing cerebral edema. In pediatric DKA, how you treat matters as much as when you treat.

What Is Pediatric DKA?

DKA is defined by the triad of:

• Hyperglycemia (usually >200 mg/dL in children)
• Metabolic acidosis (pH <7.3 or HCO₃⁻ <15)
• Ketosis (blood or urine)

It may be:

• New-onset diabetes (very common in kids)
• Known diabetes with infection, missed insulin, or stress trigger

Why Kids Are Different (and More Dangerous)

• Higher risk of cerebral edema than adults
• Smaller margins for fluid and electrolyte errors
• Can deteriorate rapidly despite appearing “stable”

Rookie pearl: In pediatric DKA, aggressive treatment kills — controlled treatment saves.

Red Flags at Presentation

• Polyuria, polydipsia, weight loss
• Vomiting, abdominal pain (often mimics surgical abdomen)
• Kussmaul respirations
• Fruity (acetone) breath
• Lethargy, irritability, confusion
• Shock (late and ominous)

Step 1: Immediate ED Assessment

• ABCs first — airway protection if GCS ↓
• Full vitals (BP, HR, RR, SpO₂, temperature)
• Bedside glucose immediately
• Weight (critical for dosing)
• Neurological baseline (for later cerebral edema monitoring)

Step 2: Initial Investigations

• Blood gas (VBG acceptable)
• Electrolytes (Na, K, Cl, bicarbonate)
• Serum ketones / β-hydroxybutyrate
• BUN/creatinine
• CBC (infection trigger)
• Urinalysis (ketones)
• ECG if potassium abnormal

Important: Correct sodium for hyperglycemia
Corrected Na⁺ = Measured Na⁺ + 1.6 × ((glucose − 100) / 100)

Step 3: Fluids — The Most Critical Step

Initial Bolus

• If shocked: 10–20 mL/kg isotonic saline (NS or LR)
• If not shocked: NO routine bolus

Maintenance + Deficit Replacement

• Calculate maintenance + deficit
• Replace deficit slowly over 36–48 hours
• Use isotonic fluids initially

Rookie mistake: multiple large boluses → ↑ risk of cerebral edema

Step 4: Insulin (Delayed on Purpose)

• Start 1–2 hours AFTER fluids
• Regular insulin infusion: 0.05–0.1 U/kg/hr
• NO insulin bolus — ever

Goal:

• Glucose fall: 50–100 mg/dL per hour

Step 5: Potassium Management

• Total body potassium is always depleted, even if serum K⁺ is normal/high

Never start insulin without knowing potassium.

Step 6: When Glucose Falls <250 mg/dL

• Add dextrose to IV fluids (D5 or D10)
• Continue insulin to clear ketones
• Goal is ketone resolution, not just glucose normalization

Cerebral Edema: The Killer Complication

Occurs in ~1% but accounts for most DKA deaths.

Warning Signs

• Headache
• Sudden bradycardia
• Hypertension
• Altered mental status
• Vomiting
• Cranial nerve palsies

Immediate Treatment

• Mannitol 0.5–1 g/kg IV OR
• Hypertonic saline 3% (3–5 mL/kg)
• Elevate head, reduce fluids
• ICU + neurology immediately

Rookie pearl: Treat suspected cerebral edema immediately — do not wait for imaging.

Disposition

• All pediatric DKA patients are admitted
• Moderate–severe DKA → PICU
• Mild cases → monitored pediatric unit

Common Rookie Mistakes

• Giving insulin bolus
• Over-resuscitating with fluids
• Ignoring potassium
• Treating abdominal pain surgically
• Missing early cerebral edema signs

Rookie Pearls

• Fluids first, insulin later
• Slow correction prevents brain injury
• Glucose drop ≠ DKA resolution
• Always think about cerebral edema
• When in doubt, go slower — not faster

Take-Home Message

Pediatric DKA is high-risk, high-precision medicine.
For rookies:

• Diagnose early
• Correct slowly
• Monitor neurologic status relentlessly
• Treat cerebral edema immediately if suspected

Remember: In pediatric DKA, the fastest way is the safest way — and the safest way is slow.