Pediatric DKA Updates

Pediatric diabetic ketoacidosis is defined by hyperglycemia, acidosis, and ketosis, but the dangerous bedside problems are potassium shifts and evolving cerebral edema. Fluid choice matters less than many clinicians were taught, while frequent neurologic reassessment and potassium-first insulin decisions matter more.

Pediatric DKA Recognition and Severity

• Diagnostic triad in children: Pediatric DKA requires hyperglycemia above 200 mg/dL plus acidosis and ketosis, using either beta-hydroxybutyrate or moderate-to-large urine ketones to confirm the syndrome.
• Acidosis-based severity bands: Severity tracks with pH categories, with severe DKA marked by pH below 7.1 and typically about 10% dehydration rather than the roughly 5% seen in more moderate disease.
• COVID-associated metabolic risk: COVID infection appears to increase hyperglycemia and DKA risk in children, likely through pancreatic involvement, a link worth keeping in mind during triage and reassessment.

Fluids, Insulin, and Electrolytes

• Fluid choice myth correction: PECARN data found similar neurologic outcomes across different fluid rates and sodium chloride strategies, so early rehydration matters more than agonizing over the exact bag choice. We get into the practical bedside implications in the episode.
• Initial volume approach: A sensible starting point is 10 mL/kg of 0.9% saline over 30 to 60 minutes, with repeat 20 mL/kg isotonic bolus reserved for children in shock with weak pulses or hypotension.
• Potassium before insulin: Total body potassium depletion is the electrolyte emergency in pediatric DKA, and potassium should be 3.5 to 5.5 mEq/L before insulin is started.
• Insulin infusion strategy: Insulin boluses are out; use a continuous infusion at 0.05 to 0.1 units/kg/hour and aim for glucose to fall by about 100 mg/dL per hour.
• Phosphate timing nuance: Phosphate depletion often declares itself later, about a day into hospitalization, so an early baseline matters even when the initial ED problem is potassium.

Cerebral Edema Surveillance and Rescue

• Early neurologic warning signs: New headache, focal neurologic deficits, and especially cranial nerve changes can be the first clues to cerebral edema, and worsening hypertension should raise concern.
• Frequent neuro checks: Serial neurologic reassessment is not optional in pediatric DKA because subtle deterioration may precede obvious decompensation. We cover the bedside red flags to watch for in the chapter.
• Immediate osmotherapy choices: Treat suspected cerebral edema before waiting on CT, using mannitol or 3% saline, with mannitol carrying the stronger evidence base.
• Airway management caution: If intubation becomes necessary, avoid hyperventilation and try to match the child’s preintubation respiratory rate, while protecting cerebral perfusion and minimizing apneic time.

References: 

1. Agwu JC, et al. Fluid and electrolyte therapy in childhood diabetic ketoacidosis management: A rationale for new national guideline. Diabet Med. 2021;38(8):e14595. PMID: 33963601
2. Tzimenatos L, et al. Managing Diabetic Ketoacidosis in Children. Ann Emerg Med. 2021;78(3):340-345. PMID: 33966934
3. Al-Kuraishy HM, et al. COVID-19 in Relation to Hyperglycemia and Diabetes Mellitus. Front Cardiovasc Med. 2021;8:644095. Published 2021 May 20. PMID: 34124187
4. Buggs-Saxton C. Care of Pediatric Patients with Diabetes During the Coronavirus Disease 2019 (COVID-19) Pandemic. Pediatr Clin North Am. 2021;68(5):1093-1101. PMID: 34538301
5. Rugg-Gunn CE, et al. Update and harmonisation of guidance for the management of diabetic ketoacidosis in children and young people in the UK. BMJ Paediatr Open. 2021;5(1):e001079. Published 2021 Jun 4. PMID: 34151029
6. Ravikumar N, et al. Application of bench studies at the bedside to improve outcomes in the management of severe diabetic ketoacidosis in children-a narrative review. Transl Pediatr. 2021;10(10):2792-2798. PMID: 34765501
7. Kuppermann N, et al. Clinical Trial of Fluid Infusion Rates for Pediatric Diabetic Ketoacidosis. N Engl J Med. 2018;378(24):2275-2287. PMID: 29897851