BACKGROUND: The role of inherited prothrombotic conditions, including factor V Leiden (FV G1691A), prothrombin G20210A, and the methylenetetrahydrofolate reductase (MTHFR) C677T genotype, in the pathogenesis of ischemic stroke is not well established. The effects of these factors may be potentiated by the use of oral contraceptives, analogous to observations in venous thrombosis. METHODS: Patients (n = 193) were women aged 20-49 years with ischemic stroke. Controls (n = 767) were women without arterial thrombosis stratified for age, calendar year of the index event, and residence. The relative risk of ischemic stroke was estimated with unconditional logistic regression, adjusted for stratification variables. FINDINGS: Factor V Leiden and MTHFR 677TT were more common in patients than in controls [odds ratio (OR): 1.8; 95% confidence interval (CI): 0.9-3.6 respectively OR: 1.5; 95% CI: 0.9-2.6]. The frequency of prothrombin G20210A was similar in cases and controls. Carriers of FV Leiden using oral contraceptives had a 11.2-fold (95% CI: 4.3-29.0) higher risk of ischemic stroke than women without either risk factor. Women with MTHFR 677TT using oral contraceptives had a 5.4-fold (95% CI: 2.4-12.0) higher risk than women without these risk factors. INTERPRETATION: These data suggest that carriers of FV Leiden or MTHFR 677TT who use oral contraceptives have an increased risk of ischemic stroke. When these findings are confirmed, a cost-effectiveness analysis should indicate whether ischemic stroke could be prevented with genetic testing before the start of oral contraceptives.
BACKGROUND: The role of inherited prothrombotic conditions, including factor V Leiden (FV G1691A), prothrombin G20210A, and the methylenetetrahydrofolate reductase (MTHFR) C677T genotype, in the pathogenesis of ischemic stroke is not well established. The effects of these factors may be potentiated by the use of oral contraceptives, analogous to observations in venous thrombosis. METHODS:Patients (n = 193) were women aged 20-49 years with ischemic stroke. Controls (n = 767) were women without arterial thrombosis stratified for age, calendar year of the index event, and residence. The relative risk of ischemic stroke was estimated with unconditional logistic regression, adjusted for stratification variables. FINDINGS:Factor V Leiden and MTHFR 677TT were more common in patients than in controls [odds ratio (OR): 1.8; 95% confidence interval (CI): 0.9-3.6 respectively OR: 1.5; 95% CI: 0.9-2.6]. The frequency of prothrombin G20210A was similar in cases and controls. Carriers of FV Leiden using oral contraceptives had a 11.2-fold (95% CI: 4.3-29.0) higher risk of ischemic stroke than women without either risk factor. Women with MTHFR 677TT using oral contraceptives had a 5.4-fold (95% CI: 2.4-12.0) higher risk than women without these risk factors. INTERPRETATION: These data suggest that carriers of FV Leiden or MTHFR 677TT who use oral contraceptives have an increased risk of ischemic stroke. When these findings are confirmed, a cost-effectiveness analysis should indicate whether ischemic stroke could be prevented with genetic testing before the start of oral contraceptives.
Authors: Grażyna Adler; Jeremy S C Clark; Beata Loniewska; Ewa Czerska; Nermin N Salkic; Andrzej Ciechanowicz Journal: Bosn J Basic Med Sci Date: 2012-05 Impact factor: 3.363
Authors: Baijia Jiang; Kathleen A Ryan; Ali Hamedani; Yuching Cheng; Mary J Sparks; Deborah Koontz; Christopher J Bean; Margaret Gallagher; W Craig Hooper; Patrick F McArdle; Jeffrey R O'Connell; O Colin Stine; Marcella A Wozniak; Barney J Stern; Braxton D Mitchell; Steven J Kittner; John W Cole Journal: Stroke Date: 2014-03-11 Impact factor: 7.914
Authors: Ali G Hamedani; John W Cole; Yuching Cheng; Mary J Sparks; Jeffrey R O'Connell; Oscar C Stine; Marcella A Wozniak; Barney J Stern; Braxton D Mitchell; Steven J Kittner Journal: J Stroke Cerebrovasc Dis Date: 2011-11-18 Impact factor: 2.136
Authors: Noortje A M M Maaijwee; Loes C A Rutten-Jacobs; Pauline Schaapsmeerders; Ewoud J van Dijk; Frank-Erik de Leeuw Journal: Nat Rev Neurol Date: 2014-04-29 Impact factor: 42.937