Successful Management of a Possible Antibiotic-Related Acquired Factor V Inhibitor: A Case Report and Review of the Literature

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Acquired factor inhibitors are rare. We report a case of an elderly male who presented with a bleeding diathesis associated with an elevated prothrombin time and an activated partial thromboplastin time. Work-up revealed undetectable factor V activity and a factor V inhibitor level of >50 Bethesda units. The inhibitor may have been triggered by antibiotics. With a multimodality approach using steroids, platelet transfusions, intravenous immunoglobulin, factor VIII inhibitor bypass activity agent and cyclophosphamide, we successfully eliminated the inhibitor and controlled the bleeding.

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