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Maternal Kell blood group alloimmunization.

J M Bowman1, J M Pollock, F A Manning

  • 1Department of Pediatrics and Child Health, Faculty of Medicine, University of Manitoba, Winnipeg, Canada.

Obstetrics and Gynecology
|February 1, 1992
PubMed
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Kell hemolytic disease can be severe, comparable to Rh(D) hemolytic disease. Early amniocentesis and fetal blood sampling are crucial for predicting and managing Kell hemolytic disease in newborns.

Area of Science:

  • Obstetrics and Gynecology
  • Neonatology
  • Immunology

Background:

  • Conflicting views exist on the severity of Kell hemolytic disease of the newborn.
  • Kell hemolytic disease is a rare but potentially serious condition affecting newborns.

Purpose of the Study:

  • To review the clinical experience with Kell-alloimmunized pregnancies.
  • To assess the severity and management of Kell hemolytic disease.

Main Methods:

  • Retrospective review of pregnant Kell-alloimmunized women from Manitoba and referred cases (1944-1990).
  • Analysis of pregnancy outcomes, infant status, and treatment interventions.
  • Evaluation of diagnostic accuracy of amniocentesis and fetal blood sampling.

Main Results:

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  • Of 459 pregnancies in Kell-immunized women, 63 resulted in abortion or stillbirth unrelated to anti-Kell.
  • 20 infants were affected by Kell hemolytic disease, with 4 deaths (1 kernicterus, 3 hydrops) occurring between 1948-1954.
  • Amniotic fluid delta OD 450 readings were 83-89% accurate in predicting disease severity, with inaccuracies noted in the second trimester.

Conclusions:

  • Kell hemolytic disease can be as severe as Rh(D) hemolytic disease.
  • Amniocentesis at 16-20 weeks is recommended for high-risk pregnancies (history of hydrops, Kell-positive father, high maternal anti-Kell titer).
  • Fetal blood sampling and intravascular transfusion are indicated for severe cases or when amniocentesis is not feasible.