title: Low levels of tissue factor pathway inhibitor increase the risk of cerebral venous thrombosis.
abstract: BACKGROUND
  Decreased concentration of tissue factor pathway inhibitor (TFPI) is a risk factor for development of deep venous thrombosis and coronary heart disease, but there is no evidence for the relationship between TFPI and cerebral venous and sinus thrombosis (CVST). The aim of this study was to determine the level of TFPI in healthy population and in patients with CVST.
  
  
  METHODS
  We determined the plasma level of TFPI in 20 patients with CVST (cases) and 31 healthy volunteer subjects (as control group) by enzyme linked immunoassay method. We also examined the association between TFPI and the risk of CVST. Continuous variables were compared between groups using Student's t test, and odds ratio was calculated by multiple logistic regression analysis.
  
  
  RESULTS
  The mean TFPI was significantly lower in the CVST group compared with the control group (8.60 ± 4.05 ng/mL; 14.6 ± 8.6 ng/mL; P = 0. 005), respectively. The odds ratio for CVST associated with low (<25(th) percentile) levels of TFPI was 5.429 (95% CI, 1.487-19.82, P = 0.012).
  
  
  CONCLUSIONS
  Our investigation demonstrates that reduced TFPI may be one of the risk factors of CVST and associated with increasing the risk of developing CVST.
authors.affiliation: Department of Physiology, Applied Physiology Research Center, Isfahan University of Medical Sciences, Hezar Jerib Avenue, Isfahan, Iran.
authors.forename: Shaghayegh Haghjooy
authors.initials: SH
authors.lastname: Javanmard
authors.affiliation: Department of Physiology, Applied Physiology Research Center, Isfahan University of Medical Sciences, Hezar Jerib Avenue, Isfahan, Iran.
authors.forename: Tayebeh
authors.initials: T
authors.lastname: Shahsavarzadeh
authors.affiliation: Department of Neurology, Isfahan Medical School, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Saadatnia
keywords: Cerebral venous; sinus thrombosis; tissue factor pathway inhibitor