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How clinically important are non-D Rh antibodies?

Susan Healsmith1,2,3, Helen Savoia4,5, Stefan C Kane1,2

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Non-D Rh alloimmunization in pregnancy, though uncommon, can cause significant fetal and neonatal complications. Severe outcomes were linked to compound antibodies or co-existing anti-D antibodies.

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Area of Science:

  • Immunology
  • Obstetrics
  • Perinatology

Background:

  • RhD immunoglobulin prophylaxis has reduced RhD alloimmunization.
  • Non-D Rh antibodies now represent a larger proportion of alloimmunized pregnancies.
  • Research on non-D Rh antibodies is limited.

Purpose of the Study:

  • To investigate the incidence of non-D Rh alloimmunization.
  • To determine the clinical outcomes of pregnancies affected by non-D Rh alloimmunization.
  • To identify risk factors for severe outcomes.

Main Methods:

  • Retrospective study of pregnancies with non-D Rh antibodies (anti-C, -E, -c, -e, -C w, anti-CD, -cE, -ce).
  • Data collected from 2009-2013 at a tertiary Australian maternity service.
  • Included maternal demographics, antibody details, pregnancy course, and neonatal outcomes.

Main Results:

  • 115 non-D Rh alloimmunized pregnancies identified in 102 mothers.
  • 49 pregnancies reached critical titer; 11 fetuses received intrauterine transfusion.
  • 38 inductions/cesareans, 43 special care nursery admissions, 59 phototherapy treatments, 9 anemia treatments, 10 IVIG treatments.

Conclusions:

  • Non-D Rh alloimmunization affects 0.33% of pregnancies and can cause significant fetal/neonatal morbidity.
  • Most severe outcomes, including perinatal deaths, were associated with compound antibodies (anti-CD, anti-cE) or non-D Rh antibodies with anti-D.
  • Further research is needed to understand and manage non-D Rh alloimmunization effectively.