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Extremely low birthweight neonates with phenylketonuria require special dietary management

Marketa Zemanova1, Petr Chrastina2, Vaclav Sebron3

  • 1Department of Biochemistry, Faculty Hospital Motol, Prague, Czech Republic.

Acta Paediatrica (Oslo, Norway : 1992)
|July 21, 2021
PubMed

Insights

Extremely low birthweight neonates with phenylketonuria (PKU) can tolerate higher phenylalanine levels initially. Careful monitoring and dietary adjustments are crucial for managing their nutritional needs during rapid growth.

Area of Science:

  • Neonatal Medicine
  • Metabolic Disorders
  • Nutritional Science

Background:

  • Extremely low birthweight (ELBW) neonates have high protein needs, posing challenges when they also have phenylketonuria (PKU).
  • Limited availability of specialized parenteral or enteral nutrition formulas complicates management for ELBW neonates with PKU.
  • Phenylketonuria (PKU) is a rare genetic disorder requiring strict phenylalanine restriction.

Purpose of the Study:

  • To analyze the tolerance to phenylalanine in extremely low birthweight (ELBW) neonates diagnosed with phenylketonuria (PKU).
  • To investigate the safety and efficacy of specialized low-phenylalanine nutrition in this vulnerable population.

Main Methods:

  • A retrospective analysis of three ELBW neonates (720-950g) with PKU was conducted.
  • Neonates received specialized low-phenylalanine parenteral or enteral nutrition.
  • Phenylalanine levels and weight gain were monitored closely.

Main Results:

  • Phenylalanine levels normalized within one week of initiating specialized nutrition.
  • ELBW neonates with PKU demonstrated high phenylalanine tolerance (70-110 mg/kg) in early infancy.
  • Tolerance decreased significantly as infants grew older.

Conclusions:

  • Specialized dietary management is essential for ELBW neonates with PKU.
  • Regular phenylalanine level assessments are critical in the initial weeks to guide timely dietary adjustments.
  • Transitory high phenylalanine tolerance necessitates dynamic nutritional strategies in these infants.
Abstract

Keywords:
ELBWdietary managementphenylalaninephenylketonuriatolerance

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