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[Rhesus antagonism, sometimes different from usual].

R Rodrigues Pereira1, M G Van Wilgenburg

  • 1St. Clara Ziekenhuis, Rotterdam.

Tijdschrift Voor Kindergeneeskunde
|August 1, 1989
PubMed
Summary

This study details three unusual cases of rhesus antagonism in infants. Unique laboratory findings and clinical courses highlight the need for accurate diagnosis in rhesus D variant and antibody-mediated conditions.

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Area of Science:

  • Pediatrics
  • Immunology
  • Genetics

Background:

  • Rhesus antagonism, typically due to RhD incompatibility, can cause hemolytic disease in newborns.
  • Standard diagnostic and management protocols may not apply to atypical presentations of rhesus antagonism.

Observation:

  • Three pediatric cases with rhesus antagonism presented with atypical laboratory findings and clinical courses.
  • Case 1 involved a mother and child with O positive blood types, later found to have a rhesus D VI variant.
  • Case 2 presented with a 'blocked' D-antigen due to excess anti-D antibodies, despite apparent ABO compatibility.
  • Case 3 exhibited symptoms mimicking Graft versus Host disease, ultimately diagnosed as congenital myelofibrosis, following an exchange transfusion for presumed rhesus antagonism.

Findings:

  • Atypical rhesus antagonism can arise from rhesus D variants (e.g., D VI) leading to discrepancies in blood typing.
  • Excess maternal anti-D antibodies can 'block' fetal D-antigens, complicating serological interpretation.
  • Congenital myelofibrosis can present with features that may be initially misattributed to severe hemolytic disease.

Implications:

  • Accurate diagnosis of atypical rhesus antagonism and related conditions is crucial for appropriate management.
  • Correct identification of rhesus D variants and antibody complexities impacts future pregnancy care and blood transfusion strategies.
  • Understanding these rare presentations is vital for genetic counseling and preventing adverse outcomes in subsequent pregnancies.

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