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Paeds Casesendocrinology-diabetes-and-growth

Paeds Cases · endocrinology-diabetes-and-growth

Endocrine emergencies: integrated approach — structured clinical encounter

Structured encounter testing the integrated approach to a 4-year-old with undiagnosed new-onset DKA who develops cerebral oedema during treatment: the recognition, the bedside triage, the empiric resuscitation with fluids and an insulin infusion, the cerebral-oedema protocol, and parent communication about new-onset diabetes and the sick-day plan.

structured clinical encounter
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Target exams

RACP General PaediatricsRACP DCEMRCPCH ClinicalRCPSC Pediatrics

Target exams

RACP General PaediatricsRACP DCEMRCPCH ClinicalRCPSC Pediatrics
Prompt
A 4-year-old girl is brought to the emergency department with two weeks of polyuria, polydipsia and weight loss attributed to a viral illness, and is now vomiting with deep sighing breathing. Bedside glucose is 28 mmol per litre, venous pH 7.08, bicarbonate 8 mmol per litre, beta-hydroxybutyrate 5.2 mmol per litre, corrected sodium 137 mmol per litre. She is drowsy but rousable. Four hours into treatment she develops a headache and becomes drowsier with a heart rate of 60 and a blood pressure of 130 over 90. You are the paediatric registrar working through the recognition, the resuscitation, the cerebral-oedema complication and the family conversation.

Recognition and the bedside triage

The candidate recognises the metabolic pattern from the shared framework: a high glucose with a high-anion-gap metabolic acidosis and ketones is DKA until proven otherwise. The severity is graded severe (pH below 7.1, bicarbonate below 10). The candidate must state why the diabetes was missed — the polyuria attributed to a virus, the weight loss to a poor appetite, and no bedside glucose checked at the earlier presentations — and name the habit that would have caught it: the bedside glucose on every sick child. [1] [5]

Immediate resuscitation

The candidate resuscitates in three steps. First, fluids: a 10 mL per kg bolus of 0.9 per cent saline because the child is drowsy and dehydrated, then a structured regimen replacing the deficit plus maintenance over 36 to 48 hours. Second, insulin: an infusion at 0.05 to 0.1 units per kg per hour started AFTER the first fluid — the candidate must state that insulin is NEVER given as a bolus in paediatric DKA because it causes dangerous hypokalaemia and increases cerebral-oedema risk. Third, potassium: 40 mmol per litre in the maintenance fluid once the serum level is known and the child is urinating. The candidate must state two things that must NOT be done: no insulin bolus and no bicarbonate. [1] [4]

The cerebral-oedema protocol

Four hours in, the child develops a headache and altered consciousness with bradycardia and hypertension. The candidate must recognise the Cushing response and altered consciousness as cerebral oedema — the leading cause of diabetes-related death in children — and treat immediately: mannitol 0.5 to 1 g per kg or 3 per cent hypertonic saline 2 to 5 mL per kg, reduce the fluid rate by one third, and prepare for intubation and ventilation. The candidate must state that treatment is NOT delayed for a CT scan, because delay is the preventable cause of death. The candidate must name the modifiable risk factors: bicarbonate use, insulin bolus, high fluid rate, and severe acidosis or a low corrected sodium at presentation. Cerebral oedema complicates roughly 0.5 to 1 per cent of paediatric DKA episodes and carries a 20 to 40 per cent mortality. [3] [13] [14]

Family communication

The conversation names the disease in plain language: her body has stopped making insulin, which is why the sugar built up in her blood and made her sick, and she now needs lifelong insulin. The candidate acknowledges the cerebral-oedema complication honestly and explains what was done and why. The candidate builds the sick-day plan before discharge: never stop insulin during illness, check glucose and ketones every 2 to 3 hours, give correction insulin if ketones rise, maintain hydration, and present early if vomiting or drowsy. The candidate arranges structured follow-up with paediatric diabetes, a diabetes educator, a dietitian and a psychologist, with a school care plan and a MedicAlert. [1]

The integrated principle and the preventable death

The candidate closes on the synthesis: this child's emergency is one example of the shared framework that unifies all paediatric endocrine emergencies — recognise early, check the bedside glucose and gas, give the empiric therapy before the confirmatory test, follow the structured protocol, and build the plan that prevents the next emergency. The preventable failure is named — the missed diagnosis treated as a virus or gastroenteritis while the endocrine axis fails — and the countermeasure is the bedside glucose, gas and electrolytes on every sick child. [1] [5]

References

  1. [1]Glaser N; Barnett P; McCaslin I; et al ISPAD clinical practice consensus guidelines 2022: Diabetic ketoacidosis and hyperglycemic hyperosmolar state. Pediatr Diabetes, 2022.PMID 36250645
  2. [3]Glaser N; Barnett P; McCaslin I; et al Risk factors for cerebral edema in children with diabetic ketoacidosis. The Pediatric Emergency Medicine Collaborative Research Committee of the American Academy of Pediatrics. N Engl J Med, 2001.PMID 11172153
  3. [4]Kuppermann N; Ghetti S; Schunk JE; et al Clinical Trial of Fluid Infusion Rates for Pediatric Diabetic Ketoacidosis. N Engl J Med, 2018.PMID 29897851
  4. [5]Rushworth RL; Torpy DJ; Falhammar H Adrenal Crisis. N Engl J Med, 2019.PMID 31461595
  5. [11]Glaser NS; Marcin JP; Wootton-Gorges SL; et al Serum Sodium Concentration and Mental Status in Children With Diabetic Ketoacidosis. Pediatrics, 2021.PMID 34373322
  6. [13]Azova S; Ratner R; Kuelbs C; Bhasin M; Buonocore C; Cohen M; Glaser N Brain injury in children with diabetic ketoacidosis: Review of the literature and a proposed pathophysiologic pathway for the development of cerebral edema. Pediatr Diabetes, 2021.PMID 33197066
  7. [14]Muir AB; Quisling RG; Yang MC; Rosenbloom AL Cerebral edema in childhood diabetic ketoacidosis: natural history, radiographic findings, and early identification. Diabetes Care, 2004.PMID 15220225