Maple in the Diaper Pail: Day-Four Neonate in Metabolic Crisis
Maple in the Diaper Pail: Day-Four Neonate in Metabolic Crisis - Neonatology clinical simulation case. Day-4-of-life male neonate, born at term to a...
Gender: Male • Setting: Emergency Triage
Clinical Presentation & History
Day-4-of-life male neonate, born at term to a healthy G2P2 mother after an uncomplicated pregnancy and delivery, presenting with progressive poor feeding, lethargy, episodic hypertonia with opisthotonic posturing, and a distinctive sweet, burnt-sugar odor emanating from the diaper and sweat. The infant was discharged home at 48 hours on routine breastfeeds and has now acutely decompensated over the past 18 hours.
Acute Resuscitation Milestones & Priorities
Clinical phases and key interventions encountered in this emergency module:
Phase 1 — Triage & Suspicion of a Metabolic Encephalopathy
Phase 4 — Bridging to BCAA-Free Formula, Family Counseling & Definitive Transfer
High-Yield Clinical Pearls
Day 3–5 of life decompensation in a previously well term neonate plus a burnt-sugar odor is MSUD until proven otherwise — protein intake must stop immediately.
Leucine >1,000 µmol/L with neurologic symptoms is the threshold for extracorporeal removal; CVVH or hemodialysis is preferred over peritoneal dialysis for speed.
Thiamine (100 mg/day IV) should be trialed as a cofactor for any residual BCKDH activity, especially in thiamine-responsive variants.
Do not use sodium phenylacetate/benzoate in MSUD — ammonia is typically normal; the toxin is leucine itself.
Transfer to a metabolic center, lifelong BCAA-free formula, and genetic counseling for autosomal recessive recurrence (25%) are cornerstones of long-term outcome.
Test Your Clinical Reasoning in Real Time
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