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Recurrent stupor due to lysinuric protein intolerance
N V Ahsan Moosa1, D Minal, Ananth N Rao
1Department of Neurology, Amrita Institute of Medical Sciences & Research Center, Cochin, Kerala, India. nvahsanmoosa@aimshospital.org
Neurology India
|October 19, 2005
Summary
Recurrent stupor in children can signal rare inherited metabolic disorders. Early diagnosis of lysinuric protein intolerance (LPI) and protein-restricted diet led to significant neurological improvement in a young girl.
Area of Science:
- Biochemistry
- Pediatric Neurology
- Genetics
Background:
- Recurrent stupor in children presents a diagnostic challenge, with inherited metabolic disorders being a primary consideration.
- Lysinuric protein intolerance (LPI) is a rare autosomal recessive metabolic disorder characterized by defective transport of cationic amino acids.
Observation:
- A 9-year-old girl experienced recurrent episodes of stupor, initially misdiagnosed as viral encephalitis and later as non-convulsive status epilepticus.
- Hyperammonemia was identified during a subsequent episode, prompting further investigation.
Findings:
- Metabolic work-up, including a dietary protein challenge, revealed the classical biochemical features of lysinuric protein intolerance.
- The patient demonstrated marked neurological improvement after initiation of a protein-restricted diet.
Implications:
- This case highlights the importance of considering inherited metabolic disorders in the differential diagnosis of recurrent stupor in children.
- Timely diagnosis and management of LPI with dietary modifications can significantly improve neurological outcomes.
- Understanding the genetic basis and clinical presentation of LPI is crucial for pediatricians and metabolic specialists.