Plasma Exchange and N-Acetylcysteine Therapy in a Case of Congenital Thrombotic Thrombocytopenic Purpura Presenting With Acute Renal Failure.

Congenital thrombotic thrombocytopenic purpura (cTTP), which is associated with mutations in the gene for a disintegrin and metalloproteinase with a thrombospondin type 1 motif member 13 (ADAMTS13), is a chronic and lifelong disease. The clinical course is variable. Regularly using ADAMTS13-containing products such as fresh frozen plasma (FFP) for long-term prophylaxis is the most important treatment to prevent thrombotic microangiopathy (TMA) episodes. Here, we identified novel pathogenic mutations of ADAMTS13 in our patients who experienced severe acute renal failure. Infections can trigger acute hemolytic episodes, and if the initiation of FFP therapy is delayed, this leads to severe organ dysfunction, as in our case. We have shown that regular use of products containing ADAMTS13 can reverse TMA episodes and long-term morbidity and mortality. When severe acute renal failure occurs, daily plasma exchange and N-acetylcysteine (NAC) are useful.