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Transfus Apher Sci. 2011 Oct;45(2):199-202. doi: 10.1016/j.transci.2011.08.003. Epub 2011 Sep 1.

High frequency of autoimmunization among transfusion-dependent Tunisian thalassaemia patients.

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  • 1Service d'immuno-hématologie pédiatrique, Centre National de Greffe de moelle osseuse 2, rue Djebel Lakhdar, Bab Saadoun 1006, Tunis, Tunisie. drnawelguirat@yahoo.fr

Abstract

BACKGROUND:

Limited data are available on the frequency of RBC alloimmunization and autoimmunization in transfusion-dependent Tunisian β thalassaemia patients.

MATERIALS AND METHODS:

We analyzed the clinical and transfusion records of 130 patients (57 females and 73 males; mean age 119 months; range 12-11 months) with β thalassaemia major and who had regular blood transfusions for periods ranging from 12 to 311 months.

RESULTS:

Of the 130 patients, ten (7.7%) developed RBC alloantibodies. The most common alloantibodies were directed against antigens in the Rh systems. Erythrocyte-autoantibodies as determined by a positive direct antiglobulin Coombs test, developed in 52(40%) patients with and without underlying RBC alloantibodies, thereby causing autoimmune haemolytic anaemia in eleven patients (21%).

CONCLUSIONS:

Autoimmunization to erythrocyte antigens is a frequent complication in patients with β thalassaemia major. Several factors might have contributed to the high autoimmunization rate observed in this study, including non phenotypic blood exposure and alloantibody formation prior to positive Coombs test.

Copyright © 2011 Elsevier Ltd. All rights reserved.

PMID:
21889408
[PubMed - indexed for MEDLINE]
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