Coagulation factor XI is a contaminant in intravenous immunoglobulin preparations.

Abstract:

:A small number of thromboembolic events, including deep venous thrombosis and myocardial infarction, have been reported in patients receiving IVIG. These events have primarily occurred in patients receiving high-dose IVIG and have been attributed to an increase in blood viscosity. To test the hypothesis that a procoagulant might be present in IgG preparations, twenty-nine samples of intravenous immunoglobulin (IVIG) from eight different manufacturers were assayed for procoagulant activity. Twenty-six of these samples shortened the clotting time of factor XI-deficient plasma. Of these, fourteen samples had factor XI activities greater than 0.001 U/ml of normal pooled plasma. The remaining samples possessed less than 0. 001 U/ml of normal plasma activity. The procoagulant activity in these samples could be inhibited by an anti-factor XI polyclonal antibody, suggesting that the procoagulant activity was factor XI. The procoagulant activity increased in two samples after storage at 4 degrees C for 4 weeks, likely as a result of factor XIa autoactivation. Additionally, activity in some IVIG samples was able to directly activate factor IX, indicating that activated factor XI was present in these samples. Finally, the degree of factor XI(a) contamination in the samples was correlated with the manufacturer, suggesting that variations in the manufacturing process or source plasma affect the level of factor XI in the IVIG product. Because addition of small amounts of factor XIa to plasma can lead to production of significant amounts of thrombin, we suggest that factor XIa present in some IVIG preparations could contribute to the in vivo risk of thrombosis after IVIG therapy.

journal_name

Am J Hematol

authors

Wolberg AS,Kon RH,Monroe DM,Hoffman M

doi

10.1002/1096-8652(200009)65:1<30::aid-ajh5>3.0.co;

keywords:

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

30-4

issue

1

eissn

0361-8609

issn

1096-8652

pii

10.1002/1096-8652(200009)65:1<30::AID-AJH5>3.0.CO;

journal_volume

65

pub_type

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