neonatal jaundice
Neonatal jaundice
Jaundice in babies usually occurs because of a normal increase in red blood cell breakdown and the fact that their immature livers are not efficient at removing bilirubin from the bloodstream.Most jaundice in newborn babies is a normal event and is not serious. In most cases, this jaundice will disappear after a few days, often without any special treatment. Jaundice in the infant appears first in the face and upper body and progresses downward toward the toes. Premature infants are more likely to develop jaundice than full-term babies.Most babies with jaundice have physiologic jaundice. This is the type of jaundice that is caused because of the natural process of breaking down red blood cells.
what causes jaundice
There are at least two significant processes that predispose normal infants to jaundice:
- The rate of bilirubin production is higher in infants than adults because their red blood cells have a shorter half-life and turn over more rapidly.
- Infants have a relatively limited ability to conjugate bilirubin, and conjugation in the liver is necessary for efficient elimination.
Additionally, there are a number of pathologic conditions that can result in neonatal jaundice. It include:
- Conditions that cause accelerated destruction of red cells, which can occur as a result of immune-mediated hemolysis, certain enzyme deficiencies, or structural abnormalities in red cells.
- Increased intestinal absorption of bilirubin, which blunts the infant’s ability to eliminate this waste product. Infants that fail to feed well are often deficient in the types of intestinal bacteria that metabolize bilirubin, and in such cases, significant amounts of bilirubin of reabsorbed into blood.
- Genetic defects in hepatic uptake of bilirubin (e.g. Gilbert’s syndrome) or deficiency in the enzyme necessary for conjugating bilirubin (uridine diphosphate glucuronosyltransferase).
