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Changes in globus pallidus with (pre)term kernicterus.
Paul Govaert1, Maarten Lequin, Renate Swarte
1Neonatal Intensive Care Unit, Sophia Children's Hospital, Rotterdam, Netherlands. paul.govaert3@pandora.be
Pediatrics
|December 5, 2003
Summary
Preterm infants with acidosis and low albumin can develop kernicterus (bilirubin-induced brain damage), leading to hearing loss and motor deficits. Serial MRI reveals changes in the globus pallidus, aiding diagnosis and prevention strategies.
Area of Science:
- Neonatal Neurology
- Pediatric Radiology
- Bilirubin Encephalopathy
Background:
- Kernicterus, or bilirubin-associated brain damage, can affect both preterm and term infants.
- Very low birth weight preterm infants may be at risk even with total serum bilirubin levels below typical exchange transfusion thresholds.
Observation:
- Five preterm infants (25-29 weeks' gestation) and three term infants with suspected kernicterus were studied.
- Preterm infants presented with severe hearing loss, quadriplegic hypertonia, and abnormal globus pallidus signals on MRI.
- Acidosis and a high bilirubin/albumin molar ratio (>0.5) were noted in preterm infants.
Findings:
- Serial MRI in preterm infants showed a progression from acute T1 hypersignal to permanent T2 hypersignal in the globus pallidus.
- Subthalamic involvement was observed on MRI, helping differentiate from other neurological disorders.
- Term infants with kernicterus showed similar MRI patterns, but sonography did not detect pallidal injury.
Implications:
- Early recognition of globus pallidus abnormalities on MRI is crucial for diagnosing kernicterus in at-risk preterm infants.
- Understanding the serial MRI changes can guide diagnostic and preventive strategies for bilirubin-induced brain damage.
- This study highlights the importance of considering factors beyond total serum bilirubin levels, such as acidosis and albumin levels, in managing hyperbilirubinemia.