Kernicterus

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Kernicterus
Bilirubin
ICD-10	P57
ICD-9	773.4, 774.7
DiseasesDB	7161
MedlinePlus	003243
eMedicine	ped/1247
MeSH	D007647

Kernicterus is damage to the brain centers of infants caused by elevated levels of bilirubin. This may be due to several underlying pathologic processes. Newborn babies are often polycythemic, meaning they have too many red blood cells. When they break down the cells, one of the byproducts is bilirubin, which circulates in the blood, and causes jaundice. Alternately, Rh incompatibility between mother and fetus may cause hemolysis of fetal red blood cells, thereby releasing unconjugated bilirubin into the fetal blood. Since the fetal blood brain barrier is not fully formed, some of this released bilirubin enters the brain and interferes with normal neuronal development.

In adults and older children, jaundice is harmless in and of itself. However, the tissues protecting the brain (the blood-brain barrier) are immature in newborns. Bilirubin penetrates the brain and is deposited in the basal ganglia, causing irreversible damage. Depending on the level of exposure, the effects range from unnoticeable to severe brain damage.

Some medications, such as trimethoprim/sulfamethoxazole may induce this disorder to the baby when taken by the mother.

External links

• CDC’s National Center on Birth Defects and Developmental Disabilities
• PICK - Parents of Infants and Children with Kernicterus