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[Propionic acidemia in the neonatal period]

O T Matsuoka1, A Yamaguchi, A L Castellanof

  • 1Instituto da Criança Prof. Pedro de Alcântara, Hospital das Clínicas, FMUSP.

Revista Do Hospital Das Clinicas
|January 29, 1999
PubMed
Summary

Propionic acidemia, an inherited metabolic disorder, can be fatal in newborns. Early diagnosis and intervention are crucial for affected infants to prevent severe neurological damage.

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Area of Science:

  • Biochemistry
  • Genetics
  • Pediatrics

Background:

  • Propionic acidemia is an inherited metabolic disorder affecting organic acid metabolism.
  • It presents with diverse clinical and biochemical manifestations, often in the neonatal period.
  • High mortality and severe neurological sequelae are characteristic in affected newborns.

Observation:

  • A healthy male newborn exhibited feeding refusal, lethargy, and hypothermia at 49 hours of life.
  • The infant rapidly developed severe neurotoxicity and metabolic acidosis.
  • Clinical symptoms indicated a potential inherited metabolic disorder.

Findings:

  • Laboratory evaluation revealed elevated urinary levels of 3-hydroxypropionic acid, 2-methyl-hydroxubutyric acid, and methylcitric acid.

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  • These specific organic acid elevations confirmed the diagnosis of propionic acidemia.
  • The biochemical profile was consistent with a defect in propionate metabolism.

    • Implications:

    • This case highlights the critical importance of prompt laboratory evaluation in neonates presenting with non-specific symptoms suggestive of metabolic disorders.
    • Early diagnosis of propionic acidemia allows for timely initiation of management to mitigate severe outcomes.
    • Understanding the metabolic pathways involved is key to developing targeted therapies for inherited organic acidemias.