Thrombotic Thrombocytopenic Purpura Associated with Ticlopidine: A Review of 60 Cases

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Abstract
Thrombotic thrombocytopenic purpura, a life-threatening multisystem disease, has been infrequently associated with use of ticlopidine, a platelet anti-aggregating agent. To review 60 cases of ticlopidine-associated thrombotic thrombocytopenic purpura. Medical records, published case reports, and case reports submitted to the U.S. Food and Drug Administration. Instances of ticlopidine-associated thrombotic thrombocytopenic purpura were identified. Ticlopidine had been prescribed for less than 1 month in 80% of the patients, and normal platelet counts had been found within 2 weeks of the onset of thrombotic thrombocytopenic purpura in most patients. Mortality rates were higher among patients who were not treated with plasmapheresis than among those who underwent plasmapheresis (50% compared with 24%; P < 0.05). Ticlopidine use may be associated with the development of thrombotic thrombocytopenic purpura, usually within 1 month of initiation of therapy. The onset of ticlopidine-associated thrombotic thrombocytopenic purpura is difficult to predict, despite close monitoring of platelet counts.

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