What is the prognosis of thrombotic thrombocytopenic purpura (TTP)?

Updated: May 25, 2021
  • Author: Theodore Wun, MD, FACP; Chief Editor: Srikanth Nagalla, MD, MS, FACP  more...
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The overall response rate to plasma exchange is 75-90%.The early mortality rate is 10-20%.

Long-term survival depends largely on the presence or absence of serious underlying comorbidities such as cancer, HIV infection, or solid organ transplantation. In the authors' series of 126 patients, the estimated 10-year survival rate of patients without comorbid conditions was 82%, compared with a survival rate of 50% if comorbid conditions were present.

A clinical severity score, incorporating the presence or absence of neurologic symptoms, creatinine, platelet count, and hemoglobin, was shown to be predictive of 30-day mortality in the authors' retrospective analysis. The absence of fever and a higher creatinine level was associated with a higher rate of relapse. However, upon further analysis of a larger cohort of patients (as yet unpublished), these factors are no longer predictive.

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