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Updated: Jun 23, 2026

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
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Kernicterus in preterm infants.

Akihisa Okumura1, Hiroyuki Kidokoro, Hiromichi Shoji

  • 1Department of Pediatrics, Juntendo University, School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan. okumura@juntendo.ac.jp

Pediatrics
|May 13, 2009
PubMed
Summary

Kernicterus in preterm infants presents with specific features, including marked hyperbilirubinemia and athetoid cerebral palsy. These findings, identified through clinical, lab, MRI, and BAEP data, aid in recognizing the condition.

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Transcutaneous Microcirculatory Imaging in Preterm Neonates
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Transcutaneous Microcirculatory Imaging in Preterm Neonates

Published on: December 31, 2015

Area of Science:

  • Neonatal Neurology
  • Pediatric Neurology
  • Neurodevelopmental Disorders

Background:

  • Kernicterus, a severe form of neonatal hyperbilirubinemia, traditionally affects term infants.
  • Understanding kernicterus in preterm infants is crucial due to their unique physiological vulnerabilities.
  • Athetoid cerebral palsy is a recognized neurological sequela of severe hyperbilirubinemia.

Purpose of the Study:

  • To delineate the characteristic clinical, laboratory, neuroimaging, and neurophysiological features of kernicterus in preterm infants.
  • To establish diagnostic criteria for kernicterus in this vulnerable population.
  • To improve the recognition and management of preterm infants with kernicterus.

Main Methods:

  • Retrospective analysis of 8 preterm infants (gestational age ≤34 weeks) with athetoid cerebral palsy.
  • Inclusion of clinical data, laboratory results, Magnetic Resonance Imaging (MRI), and Brainstem Auditory Evoked Potential (BAEP) findings.
  • Correlation of findings with gestational age, birth weight, postnatal complications, and bilirubin levels.

Main Results:

  • Most infants had very preterm gestations (≤26 weeks) and low birth weights (<1000g).
  • Neurologic symptoms typical of acute bilirubin encephalopathy were absent neonatally; athetoid cerebral palsy emerged within 6 months corrected age.
  • MRI revealed characteristic bilateral globus pallidi hyperintensities in 7/8 infants, while BAEP was abnormal in 7/8.
  • Peak total bilirubin levels >15 mg/dL were noted in 3 infants, with 3 experiencing severe postnatal complications.

Conclusions:

  • Preterm infants with athetoid cerebral palsy exhibit consistent features resembling term infant kernicterus, often associated with marked hyperbilirubinemia.
  • The combination of clinical, laboratory, MRI, and BAEP data is essential for diagnosing kernicterus in preterm infants.
  • Enhanced recognition of these features can lead to earlier diagnosis and intervention for preterm infants with kernicterus.