Abstract
Plasma exchange (PEX) using fresh frozen plasma has considerably reduced the mortality rate in patients with immune-mediated thrombotic thrombocytopenic purpura (iTTP). However, some patients still do not survive even with treatment, but little information is available regarding which treatment these patients received. This study was conducted to obtain this information in 240 patients who met the current iTTP diagnostic criteria and completed at least 30 days of follow-up except for deceased cases. These patients were divided into three groups: survivors (n = 195), TTP-related deaths (n = 32), and other cause of death (n = 13). In the TTP-related death group, 26 of 32 patients experienced sudden death, mostly following radical hypotension and bradycardia. The median follow-up time after admission was 5.0 days, and the median number of PEX sessions was 2.5. Nine patients underwent autopsy and had cardiac microvascular thrombi in arterioles. Levels of lactate dehydrogenase, total bilirubin, serum creatinine, and d-dimer were significantly higher in the TTP-related death group than in the survivors group. Frequent PEX (> 20 sessions) was not associated with TTP-related death. In the acute phase of iTTP, patients with substantial organ damage caused by microthrombi have a greater mortality risk, even after just a few PEX sessions.
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Acknowledgements
The authors would like to thank all physicians for sending the data and samples of the patients with iTTP.
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This was supported by research grants from the Ministry of Health, Labour, and Welfare of Japan.
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MK treated the patients, collected patient data, and wrote the manuscript; KS designed the study concept, analyzed data, and wrote the manuscript; IH, JK, and KH performed the histological analysis; MK, EH, and MH collected patient data; MM directed the study and wrote the manuscript.
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M. Matsumoto is a member of the clinical advisory board of Takeda Yakuhin and Sanofi. He is also an inventor of the ADAMTS13 act-ELISA. The remaining authors declare no competing financial interests.
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Kayashima, M., Sakai, K., Harada, K. et al. Strong association between insufficient plasma exchange and fatal outcomes in Japanese patients with immune-mediated thrombotic thrombocytopenic purpura. Int J Hematol 114, 415–423 (2021). https://doi.org/10.1007/s12185-021-03197-5
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DOI: https://doi.org/10.1007/s12185-021-03197-5