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Clinical features of bilirubin encephalopathy
1Department of Pediatrics, Washington University School of Medicine, St. Louis Children's Hospital, Missouri.
Insights
Bilirubin encephalopathy in infants presents varied clinical features and long-term consequences like hearing loss and motor deficits. Further research is needed for premature infants with moderate hyperbilirubinemia.
Area of Science:
- Neonatal Medicine
- Pediatric Neurology
- Clinical Toxicology
Background:
- Bilirubin encephalopathy, or kernicterus, is a preventable form of brain damage caused by high bilirubin levels in newborns.
- Clinical manifestations and long-term outcomes vary significantly based on infant age and hyperbilirubinemia severity.
Purpose of the Study:
- To delineate the clinical spectrum and long-term sequelae of bilirubin encephalopathy in term and premature infants.
- To identify risk factors and associated conditions that may exacerbate bilirubin neurotoxicity.
Main Methods:
- Review of clinical features observed in term infants during the first weeks of life.
- Analysis of long-term follow-up data for neurological and developmental outcomes in affected infants.
- Examination of available data on the consequences of hyperbilirubinemia in premature infants.
Main Results:
- Term infants exhibit distinct clinical phases, with potential long-term effects including athetosis, hearing loss, gaze abnormalities, and intellectual deficits.
- Moderate hyperbilirubinemia in term infants may cause transient motor delays, but neurotoxicity risk increases with conditions like sepsis, anoxia, and acidosis.
- Clinical consequences in premature infants are less clear, with hearing loss being common, and potential for static encephalopathy suggested by some studies.
Conclusions:
- Bilirubin encephalopathy poses significant neurological risks, particularly in term infants, necessitating vigilant monitoring and management of hyperbilirubinemia.
- The long-term impact of moderate hyperbilirubinemia in premature infants remains uncertain, highlighting the need for extended follow-up studies.
- Associated conditions significantly influence the neurotoxic potential of bilirubin, underscoring a multifactorial etiology for brain injury.
Abstract:
Clinical features of bilirubin encephalopathy vary depending on the age of the infant and the degree of hyperbilirubinemia. In term infants with hyperbilirubinemia, three distinct clinical phases are apparent in the first weeks of life, and long-term consequences include extrapyramidal disturbances (particularly athetosis), hearing loss, gaze abnormalities (particularly limitation of upward gaze), and, in a minority, intellectual deficits. In term infants with moderate hyperbilirubinemia, minor delay in motor development during the first year has been demonstrated, but with longer follow-up this delay is not apparent. Associated conditions such as sepsis, anoxia, and acidosis may increase the likelihood of neurotoxicity of bilirubin in these infants. The clinical consequences of moderate hyperbilirubinemia in premature infants are unclear. No acute clinical syndrome is recognizable during the first weeks. The results of follow-up studies are variable. Hearing loss is the commonest consequence. Follow-up through age 2 years in one large study suggests that static encephalopathy may be a sequel. Longer follow-up is needed to understand the clinical consequences of moderate hyperbilirubinemia in this important group of infants.