Acquired FXIII inhibitor: Patient characteristics and treatment outcome, a case series in Taiwan.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
Sheng-Chieh ChouMing-Ching Shen

Abstract

Acquired factor XIII (FXIII) inhibitor is a rare but possibly underdiagnosed bleeding disorder. To date, less than one hundred cases have been reported, but the number has increased rapidly in recent years, especially in Japan. Because of the rarity of this disorder, no treatment guidelines are available. In some reports, physicians treated the bleeding with cryoprecipitate or factor XIII concentrate and eradicated the inhibitor with various immune suppressants. From January 2015 to December 2018, we collected consecutive patients diagnosed as having acquired FXIII inhibitor. FXIII activity and inhibitor were measured by a fluorescent factor XIII assay using isopeptidase reaction catalyzed by activated factor XIII and the Bethesda method, respectively. Factor XIII antigen was measured by latex-enhanced immunoassay. We found five adult patients with detectable FXIII inhibitor. Four of them were older than 70. Two had systemic lupus erythematosus. All the patients presented with ecchymosis and intramuscular hematoma. No life-threatening bleeding was observed. Delayed diagnosis was common with varied time periods needed to achieve a correct diagnosis. All bleedings were treated and improved by cryoprecipitate. Steroids were given ...Continue Reading

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