Diabetic ketoacidosis in children: nursing monitoring and cerebral-oedema warning signs
- Assessment
A child in DKA needs hour-by-hour observation on a flow chart; the nurse's main job is to catch the early signs of brain injury.
What it is
Diabetic ketoacidosis is the most serious acute complication of type 1 diabetes in children, and brain injury (cerebral oedema) is its main cause of death. Fluids, insulin and electrolytes follow the medical order and the institutional protocol. The nurse's part is meticulous monitoring: vital signs and neurological checks every hour, accurate fluid balance, hourly glucose, timely blood tests and a flow chart where every observation, fluid and medicine is recorded, so that changes are seen early.
Reference values
- Glasgow total 3 to 15; ISPAD notes that scores below 14 occur in about 4 to 15 % of children treated for DKA.
- Higher risk of brain injury: younger children, new diagnosis, longer symptoms, severe acidosis, high urea, marked hypocapnia.
- Blood electrolytes, glucose, urea and blood gases on admission and every 2 to 4 hours, or as ordered.
- Weigh the child every morning.
What you need
- A flow chart for hour-by-hour observations, fluids, medicines and laboratory results.
- Cardiorespiratory monitor and pulse oximeter; glucose and ketone meter.
- Infusion pumps for fluids and insulin, per protocol.
- Paediatric Glasgow chart; nasogastric tube with suction for the obtunded child, per order.
How to measure it (and why)
- Set up the flow chart and record every observation, fluid and medicine hour by hour — trends show the response to treatment.
- Take heart rate, breathing and blood pressure hourly or more often — a slowing heart rate can be an early sign of brain injury.
- Do a neuro check every hour with the paediatric scale — consciousness changes are the key warning sign.
- Measure capillary glucose hourly and confirm with laboratory glucose — capillary meters can be wrong with poor perfusion.
- Record all intake (including oral) and all output exactly — fluid balance guides the fluid plan.
- Check that fluids and insulin run exactly as ordered on pumps — no amount is changed without the medical order.
- Send blood tests on time and report results at once — results change the fluid and electrolyte plan.
- Ask about headache and watch for vomiting after treatment starts — new or worsening headache is a warning sign.
- If consciousness falls, alert the team: the airway may need protecting and an NG tube with suction per order — this prevents aspiration.
How to read it
- Diagnostic signs of brain injury in ISPAD include abnormal motor or verbal response to pain, decorticate or decerebrate posture and abnormal breathing patterns.
- Major signs include altered or fluctuating consciousness, a sustained fall in heart rate and incontinence inappropriate for age.
- Minor signs include vomiting, headache, lethargy, high diastolic blood pressure and age under 5 years.
- Most recurrent DKA in children with known diabetes comes from missed insulin: teaching continues after recovery.
Next step: when to call for help
- Any warning sign of brain injury: call the doctor at once; treatment starts without waiting for imaging.
- Falling Glasgow score, slowing heart rate, new headache or vomiting during treatment: report immediately and recheck neuro status.
- Potassium, sodium or glucose outside the targets in the order: report at once.
- Unexpected low blood pressure: report; both too much and too little fluid are harmful.
Test yourself
Think of the answer, then tap the question to see it.
What does the nurse monitor every hour in a child with DKA?
Heart rate, respiratory rate, blood pressure, neurological status, insulin given, all intake and output, and capillary glucose.
Which signs warn of brain injury during DKA treatment?
New or worsening headache or vomiting after treatment starts, slowing heart rate, irritability, lethargy, confusion, incontinence, falling SpO2.
When does DKA-related brain injury usually appear?
Usually in the first 12 hours of treatment, though it can occur before treatment or, rarely, 24 to 48 hours later.
Why is capillary glucose checked against laboratory glucose?
Capillary meters may be inaccurate when peripheral circulation is poor or glucose is extremely high.
Connections
Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.
Sources: Guías de Práctica Clínica de la ISPAD 2022: Cetoacidosis diabética y estado hiperglucémico hiperosmolar (Glaser N et al.) (International Society for Pediatric and Adolescent Diabetes (ISPAD), 2022); When diabetic ketoacidosis becomes a neurological emergency: cerebral edema in a child with new-onset type 1 diabetes (Okonek M et al.), Front Endocrinol (Europe PMC (open access), 2026).
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Representative model, for educational purposes only.