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  • 1.
    Johansson, Kristina
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Jansson, Jan-Håkan
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Johansson, Lars
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Bylesjö, Ingemar
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Family Medicine.
    Nilsson, Torbjörn K
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Clinical chemistry.
    Eliasson, Mats
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Söderberg, Stefan
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Cardiology.
    Lind, Marcus
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Factor XII as a Risk Marker for Hemorrhagic Stroke: A Prospective Cohort Study2017In: Cerebrovascular diseases extra, ISSN 1664-5456, Vol. 7, no 1, p. 84-94Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: Coagulation factor XII (FXII) is involved in pathological thrombus formation and is a suggested target of anticoagulants. It is unclear whether FXII levels are correlated with cardiovascular risk factors and whether they are associated with myocardial infarction or ischemic or hemorrhagic stroke. The aim of this study was to investigate the correlation between FXII and cardiovascular risk factors in the general population. We also aimed to study the associations between FXII levels and future myocardial infarction and ischemic and hemorrhagic stroke.

    METHODS: This prospective cohort study measured FXII levels in 1,852 randomly selected participants in a health survey performed in northern Sweden in 1994. Participants were followed until myocardial infarction, stroke, death, or until December 31, 2011.

    RESULTS: During the median follow-up of 17.9 years, 165 individuals were diagnosed with myocardial infarction, 108 with ischemic stroke, and 30 with hemorrhagic stroke. There were weak correlations between FXII and body mass index, cholesterol, and hypertension. There was no association between FXII and myocardial infarction or ischemic stroke, neither in univariable Cox regression analysis nor after adjustment for age, sex, smoking, body mass index, cholesterol, hypertension, and diabetes. In univariable Cox regression analysis, the hazard ratio for the association between FXII levels and hemorrhagic stroke was 1.42 per SD (95% confidence interval: 0.99-2.05). In the multivariable model, higher levels of FXII were associated with increased risk of hemorrhagic stroke (hazard ratio 1.51 per SD; 95% confidence interval: 1.03-2.21).

    CONCLUSION: We found an independent association between FXII levels and the risk of hemorrhagic stroke, but not between FXII levels and ischemic stroke or myocardial infarction.

  • 2.
    Johansson, Kristina
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Jansson, Jan-Håkan
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Johansson, Lars
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Wiklund, Per-Gunnar
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Nilsson, Torbjörn K.
    Umeå University, Faculty of Medicine, Department of Medical Biosciences, Clinical chemistry.
    Lind, Marcus
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    D-Dimer is associated with first-ever intracerebral hemorrhage: a nested case-control study2018In: Stroke, ISSN 0039-2499, E-ISSN 1524-4628, Vol. 49, no 9, p. 2034-2039Article in journal (Refereed)
    Abstract [en]

    Background and Purpose - Hypertension is the most important risk factor for intracerebral hemorrhage (ICH), but further characterization is needed for groups at high risk of ICH. One way to predict the risk of developing a disease is with plasma biomarkers. This study aimed to investigate the association between the biomarker, D-dimer, and ICH risk.

    Methods - This population-based, nested case-control study was conducted using data from 2 population-based surveys; the Vasterbotten Intervention Programme and MONICA Northern Sweden (Monitoring Trends and Determinants in Cardiovascular Disease). All participants underwent a health examination and blood sampling at baseline before the event. Cases (n=141) were diagnosed with a first-ever ICH between 1985 and March 2007. One or 2 controls (n=255) were matched to each case.

    Results - The median age was 60 years; 39% of participants were women; and the median time from blood sampling to ICH was 5.2 years. When D-dimer was evaluated as a continuous variable, it was significantly associated with ICH. After multivariable adjustment (for hypertension, body mass index, cholesterol levels, diabetes mellitus, and smoking), the odds ratio was 1.36 per SD of D-dimcr (95% CI, 1.05-1.77). When participants were stratified in 3 groups according to time from blood sampling at health examination to ICH, we found that the association between D-dimer levels and ICH was most pronounced in individuals with the shortest time from blood sampling to ICH event (<3.5 years; odds ratio, 1.78; 95% CI, 1.05-3.05).

    Conclusions - High plasma concentrations of D-dimer were associated with increased risk of a future ICH, after adjusting for cardiovascular risk factors. This association was predominantly driven by the cases with the shortest time from blood sampling to ICH event.

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