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Neurometabolic testing in developmental delay.

A S Papavasiliou1, H Bazigou, E Paraskevoulakos

  • 1Department of Pediatric Neurology, Pendeli Children's Hospital, Athens, Greece. plotinus@otenet.gr

Journal of Child Neurology
|October 6, 2000
PubMed
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Neurometabolic testing aids in diagnosing developmental delay. Specific tests like lysosomal enzyme analysis are key, while others require further investigation for definitive results.

Area of Science:

  • Biochemistry
  • Pediatric Neurology
  • Genetics

Background:

  • Unexplained developmental delay (UDD) presents a diagnostic challenge in pediatrics.
  • Neurometabolic disorders are a significant, though often undiagnosed, cause of UDD.

Purpose of the Study:

  • To evaluate the diagnostic utility of a stepwise neurometabolic testing protocol in children with UDD.
  • To identify which specific neurometabolic investigations are most effective for establishing a diagnosis.

Main Methods:

  • A cohort of 118 pediatric patients (3 months to 13 years) with UDD underwent a structured, stepwise neurometabolic work-up.
  • Testing was guided by clinical and neuroradiologic findings to optimize diagnostic yield and minimize unnecessary investigations.
  • Analysis included metabolites (amino acids, ammonia, lactate, pyruvate, urine organic acids), lysosomal enzymes, very-long-chain fatty acids, and urine mucopolysaccharides.

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Main Results:

  • A definitive diagnosis of a neurometabolic disorder was achieved in 16 patients (13.6%).
  • Abnormalities in amino acids, ammonia, lactate, pyruvate, and urine organic acids often necessitated further testing rather than providing a direct diagnosis.
  • Elevated lysosomal enzymes, very-long-chain fatty acids, and urine mucopolysaccharides proved definitive for diagnosing specific neurometabolic conditions.

Conclusions:

  • Neurometabolic testing is valuable in the diagnostic work-up of children with unexplained, slowly progressing developmental delay.
  • Clear guidelines are needed to determine patient selection and the appropriate scope of neurometabolic investigations.
  • Targeted testing focusing on lysosomal enzymes, very-long-chain fatty acids, and mucopolysaccharides offers the highest diagnostic yield.