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Related Experiment Videos

Rhesus isoimmunization: increased hemolysis during early infancy

M Hayde1, J A Widness, A Pollak

  • 1Department of Neonatology, University Children's Hospital, Vienna, Austria.

Pediatric Research
|May 1, 1997
PubMed
Summary

In infants with severe Rh isoimmune hemolytic disease, elevated carboxyhemoglobin (COHb) and bilirubin levels indicate ongoing hemolysis due to persistent maternal Rh antibodies.

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Area of Science:

  • Neonatal Medicine
  • Hematology
  • Immunology

Background:

  • Hemolytic disease of the newborn is a serious condition.
  • Rh isoimmune hemolytic disease requires careful monitoring of hemolysis indicators.

Purpose of the Study:

  • To investigate elevated carboxyhemoglobin (COHb) and plasma bilirubin in infants with Rh isoimmune hemolytic disease.
  • To assess these hemolysis indicators during the first three months of life.

Main Methods:

  • Serial blood samples were collected from infants with Rh isoimmune hemolytic disease, ABO hemolytic disease, and controls.
  • Measurements included COHb, plasma bilirubin, hemoglobin, reticulocyte count, erythropoietin, enzymes, and iron.
  • Statistical comparisons were made between groups.

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Main Results:

  • Infants with Rh isoimmune hemolytic disease showed significantly lower Hb and higher bilirubin, COHb/Hb ratio, and erythropoietin at 2 and 6 weeks.
  • COHb/Hb and plasma bilirubin were significantly correlated in the Rh-immunized group.
  • Maternal Rh antibodies had a mean half-life of 14.3 days in affected neonates.

Conclusions:

  • Elevated bilirubin and COHb/Hb in early life suggest ongoing hemolysis in Rh isoimmune hemolytic disease.
  • Persistence of maternal Rh antibodies is implicated as the cause of continued hemolysis.