Thrombotic thrombocytopenic purpura in a patient with rheumatoid arthritis treated by plasmapheresis.

Thrombotic thrombocytopenic purpura (TTP) is a multisystem disorder characterized by consumptive thrombocytopenia, microangiopathic hemolytic anemia, and neurologic symptoms. TTP is associated with many diseases and several therapeutic drugs. We report the rare case of a patient with rheumatoid arthritis who developed TTP that was not associated with drug therapy, 18 months after the onset of rheumatoid arthritis. She recovered from the TTP following daily sessions of therapeutic plasma exchange (TPE) with fresh frozen plasma replacement and glucocorticoid therapy. Recent pathogenic mechanisms are reviewed as they relate to von Willebrand factor. In this report of the rare association of TTP with rheumatoid arthritis, an immediate relationship is likely because both are of an immune nature. Awareness of the possible development of TTP in rheumatoid arthritis is important for early diagnosis and treatment.