Document Detail

Risk of recurrence after a first episode of symptomatic venous thromboembolism provoked by a transient risk factor: a systematic review.
MedLine Citation:
PMID:  20975016     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: We aimed to determine the risk of recurrence for symptomatic venous thromboembolism (VTE) provoked by different transient risk factors. DATA SOURCES: MEDLINE, EMBASE, and Cochrane Collaboration Registry of Randomized Trials databases were searched. STUDY SELECTION: Prospective cohort studies and randomized trials of patients with a first episode of symptomatic VTE provoked by a transient risk factor and treated for at least 3 months were identified. DATA EXTRACTION: Number of patients and recurrent VTE during the 0- to 12-month and 0- to 24-month intervals after stopping therapy, study design, and provoking risk factor characteristics were extracted. DATA SYNTHESIS: Annualized recurrence rates were calculated and pooled across studies. At 24 months, the rate of recurrence was 3.3% per patient-year (11 studies, 2268 patients) for all patients with a transient risk factor, 0.7% per patient-year (3 studies, 248 patients) in the subgroup with a surgical factor, and 4.2% per patient-year (3 studies, 509 patients) in the subgroup with a nonsurgical factor. In the same studies, the rate of recurrence after unprovoked VTE was 7.4% per patient-year. The rate ratio for a nonsurgical compared with a surgical factor was 3.0 and for unprovoked thrombosis compared with a nonsurgical factor was 1.8 at 24 months. CONCLUSIONS: The risk of recurrence is low if VTE is provoked by surgery, intermediate if provoked by a nonsurgical risk factor, and high if unprovoked. These risks affect whether patients with VTE should undergo short-term vs indefinite treatment.
Alfonso Iorio; Clive Kearon; Esmeralda Filippucci; Maura Marcucci; Ana Macura; Vittorio Pengo; Sergio Siragusa; Gualtiero Palareti
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Archives of internal medicine     Volume:  170     ISSN:  1538-3679     ISO Abbreviation:  Arch. Intern. Med.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-26     Completed Date:  2010-11-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372440     Medline TA:  Arch Intern Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1710-6     Citation Subset:  AIM; IM    
Department of Internal Medicine, University of Perugia, Italy.
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MeSH Terms
Risk Assessment / methods*
Risk Factors
Venous Thromboembolism / epidemiology*

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