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Hyperbilirubinemia, hemolysis, and increased bilirubin neurotoxicity

Abstract Increased hemolysis in the presence of severe neonatal hyperbilirubinemia appears to augment the risk of bilirubin neurotoxicity. The mechanism of this intensifying effect is uncertain. In direct antiglobulin titer (DAT) positive, isoimmune hemolytic disease, the bilirubin threshold at whic...

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Published in:Seminars in perinatology 2014-11, Vol.38 (7), p.429-437
Main Authors: Kaplan, Michael, MBChB, Bromiker, Ruben, MD, Hammerman, Cathy, MD
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container_title Seminars in perinatology
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creator Kaplan, Michael, MBChB
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description Abstract Increased hemolysis in the presence of severe neonatal hyperbilirubinemia appears to augment the risk of bilirubin neurotoxicity. The mechanism of this intensifying effect is uncertain. In direct antiglobulin titer (DAT) positive, isoimmune hemolytic disease, the bilirubin threshold at which neurotoxicity occurs appears to be lower than in DAT-negative hyperbilirubinemia. In other hemolytic conditions, the hemolysis may simply facilitate the development of extremely high serum bilirubin levels. Whether the hemolytic process per se exerts an independent effect or whether a very rapid rise in serum bilirubin might lead to greater penetration of the blood–brain barrier is unclear. In this review, we survey the synergistic role of hemolysis associated with severe hyperbilirubinemia in the potentiation of bilirubin-induced neurotoxicity and suggest methods of identifying at-risk babies with increased hemolysis to allow for their increased surveillance.
doi_str_mv 10.1053/j.semperi.2014.08.006
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subjects Bilirubin
Bilirubin - biosynthesis
Bilirubin - blood
Bilirubin - genetics
Bilirubin neurotoxicity
Blood-Brain Barrier
Coombs Test
DAT-positive hemolytic disease
End tidal carbon monoxide
Hemolysis
Hemolysis - immunology
Hemolysis - physiology
Humans
Hyperbilirubinemia, Neonatal - blood
Hyperbilirubinemia, Neonatal - complications
Infant, Newborn
Kernicterus
Kernicterus - blood
Kernicterus - etiology
Neonatal and Perinatal Medicine
Risk Factors
title Hyperbilirubinemia, hemolysis, and increased bilirubin neurotoxicity
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