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Effect of blood group on idiopathic thrombotic thrombocytopenic purpura
Author(s) -
Zuberi Lara,
Yerasuri Durga,
Kuriakose Philip
Publication year - 2009
Publication title -
journal of clinical apheresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.697
H-Index - 46
eISSN - 1098-1101
pISSN - 0733-2459
DOI - 10.1002/jca.20202
Subject(s) - medicine , adamts13 , thrombotic thrombocytopenic purpura , von willebrand factor , incidence (geometry) , population , gastroenterology , immunology , epidemiology , platelet , physics , environmental health , optics
Thrombotic thrombocytopenic purpura (TTP) is a condition caused by deficiency of ADAMTS13 resulting in accumulation of ultra large Von Willebrand factor multimers (ULVWF), leading to micro thrombi in multiple organs. The varying susceptibilities of blood group antigens to ADAMTS13 have been demonstrated. A and B antigens are protective of VWF; and VWF purified from blood group O individuals has been shown to be cleaved faster by ADAMTS13 compared to VWF from blood group AB individuals. We proposed that there may be a difference in the incidence of blood groups in TTP patients compared with the general population. We felt this to be important for a life‐threatening disease with poorly understood epidemiology. We report a retrospective analysis of 74 patients presenting from 1993 to 2008 with idiopathic TTP. We studied the incidence across various blood groups and also estimated the recurrence and mortality in each group. The incidence of various blood groups were as follows: O 36%, A 36%, B 25%, and AB 2%, compared with expected frequencies in the Detroit area: O 44%, A 33% B 20%, and AB 3%. There was a trend of lower than expected frequency of blood group O. There were 24 recurrences and 14 deaths, uniform across blood groups. We hypothesized that there may be an association between blood groups and the risk of TTP; however the differences in our study were not statistically significant. Recurrence and disease specific mortality did not appear to be impacted by blood group. J. Clin. Apheresis 2009. © 2009 Wiley‐Liss, Inc.