Circulating microparticles and risk of venous thromboembolism

Thromb Res. 2012 May;129(5):591-7. doi: 10.1016/j.thromres.2011.08.020. Epub 2011 Sep 9.


Introduction: Circulating microparticles (MPs) may trigger a hypercoagulable state, leading to thrombotic complications. Data on their association with venous thromboembolism (VTE) are few and inconsistent.

Materials and methods: To investigate whether or not high levels of MPs are associated with an increased risk of VTE, we carried out a case-control study on 186 patients with a first, objectively diagnosed, episode of VTE and 418 healthy controls. Plasma levels of circulating MPs were measured by flow cytometry.

Results: Patients had higher median plasma levels of total MPs than controls (2184 per μL vs 1769 per μL, p<0.0001). The risk of VTE increased progressively with increasing MPs, with a linear dose-response effect in the log odds. Individuals with MPs above the 90th percentile of the controls' distribution (P(90) = 3263 per μL) had a 5-fold increased risk of VTE than those with MPs below the 10th percentile of controls (P(10) = 913 per μL), independently of sex, age, body mass index, thrombophilia, and plasma factor VIII levels [adjusted odds ratio: 5.30 (95%CI: 2.05-13.7)]. Using the 95th percentile of controls as cut-off (P(95) = 4120 per μL), the adjusted odds ratio was 2.20 (1.01-4.79) for individuals with MPs>P(95) compared with those having MPs ≤ P(95). After exclusion of individuals with antiphospholipid antibodies and hyperhomocysteinemia, the interaction between MPs>P(95) and thrombophilia increased the VTE risk from 1.63 (0.60-4.50) to 6.09 (1.03-36.1).

Conclusions: High levels of circulating MPs are a possible independent risk factor for VTE.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Case-Control Studies
  • Cell-Derived Microparticles / metabolism*
  • Child
  • Female
  • Humans
  • Male
  • Middle Aged
  • Risk Factors
  • Thrombophilia / blood
  • Venous Thromboembolism / blood*
  • Young Adult