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Seasonal association of thrombotic thrombocytopenic purpura.
MedLine Citation:
PMID:  22242922     Owner:  NLM     Status:  Publisher    
BACKGROUND: Thrombotic thrombocytopenic purpura (TTP), a thrombotic microangiopathy, is a clinical diagnosis, characterized by microangiopathic hemolytic anemia and thrombocytopenia without another likely explanation. Some initiators of the disease are well represented in the literature, such as certain drugs, malignancies, and viral illness; however, there are less objective factors still being investigated, with references to hormonal, stress, and seasonal variations considered anecdotally. A better insight of these factors would aid in understanding the pathophysiology of the disease. STUDY DESIGN AND METHODS: We performed a retrospective review of all idiopathic TTP cases treated with therapeutic plasma exchange at our institution from 1999 to 2008 to determine whether there was seasonal variation in TTP presentation. Seasons were defined as follows: winter = December to February; spring = March to May; summer = June to August; and fall = September to November. With the use of Poisson regression models, the incidence between seasons was compared. RESULTS: During this study period, a total of 97 cases were recorded. Summer had the highest occurrence of TTP (35%). This was significant compared to the fall (p = 0.012) and the winter (p = 0.019). There were more cases in the summer compared to the spring, but this was not significant. CONCLUSION: In our population, there was a significant difference in the number of TTP cases presenting in summer compared to fall and winter. This supports a possible environmental, infectious, or physiologic influence associated with the summer.
Yara A Park; Jessica L Poisson; Matthew T McBee; Araba Afenyi-Annan
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-13
Journal Detail:
Title:  Transfusion     Volume:  -     ISSN:  1537-2995     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0417360     Medline TA:  Transfusion     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 American Association of Blood Banks.
From the Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, North Carolina; and the Department of Psychology, East Tennessee State University, Johnson City, Tennessee.
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