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  • 1. Huerta, Consuelo
    et al.
    Johansson, Saga
    Wallander, Mari-Ann
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences, Family Medicine and Clinical Epidemiology.
    Rodríguez, Luis A. García
    Risk of myocardial infarction and overall mortality in survivors of venous thromboembolism.2008In: Thrombosis Journal, ISSN 1477-9560, E-ISSN 1477-9560, Vol. 6, p. 10-Article in journal (Refereed)
    Abstract [en]

    BACKGROUND

    Venous thromboembolism (VTE) and thromboembolic arterial diseases are usually considered to be distinct entities, but there is evidence to suggest that these disorders may be linked. The aim of this study was to determine whether a diagnosis of VTE increases the long-term risk of myocardial infarction (MI).

    METHODS

    The incidence rate (IR) and relative risk (RR) of MI in a cohort of patients with a diagnosis of VTE (n = 4890) compared with that of a control cohort without prior VTE (n = 43 382) were evaluated in the UK General Practice Research Database (GPRD). Death during follow-up was also determined. Patients were followed for up to 8 years (mean of 3 years).

    RESULTS

    The IR of MI per 1000 person-years was 4.1 (95% CI: 3.1-5.3) for the VTE cohort and 3.5 (95% CI: 3.2-3.8) for the control cohort. The IR of MI was highest in the first year after the VTE episode, but overall differences between the two cohorts were not significant (RR of MI associated with VTE: 1.2; 95% CI: 0.9-1.6). The risk of death was higher in the VTE cohort than the control cohort, even after adjustment for cancer, heart failure and ischaemic heart disease (RR: 2.4; 95% CI: 2.2-2.6), particularly during the first year after VTE (RR: 3.8; 95% CI: 3.4-4.3).

    CONCLUSION

    A VTE episode does not significantly increase the risk of MI, but does increase the risk of death, particularly in the first year following VTE diagnosis.

  • 2.
    Johansson, Magdalena
    et al.
    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.
    Lind, Marcus
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Incidence of venous thromboembolism in northern Sweden (VEINS): a population-based study2014In: Thrombosis Journal, ISSN 1477-9560, E-ISSN 1477-9560, Vol. 12, article id 6Article in journal (Refereed)
    Abstract [en]

    BACKGROUND: The reported incidence of venous thromboembolism (VTE) varies considerably among studies. The primary aim of this study was to describe the incidence of VTE in relation to age and sex. The secondary aim was to describe the risk factor pattern at the time of diagnosis.

    METHODS: This retrospective, population-based cohort study included all adult residents in the County of Västerbotten in northern Sweden during the year 2006 (n = 204,836). All potential VTE events were manually validated and classified according to location. The presence of risk factors for VTE at the time of diagnosis was recorded.

    RESULTS: We identified 517 adult individuals with potential VTE. Among these, 343 individuals (158 men and 185 women) had a verified VTE event in 2006. The mean incidence was 167 individuals per 100,000 person years; 155 for men and 180 for women. The mean age at diagnosis was 67.6 years in men and 72.5 years in women. The incidence of VTE increased with age. The incidence was highest in women aged 85 years or more. Pulmonary embolism with or without concurrent deep vein thrombosis was diagnosed in 161 individuals (46.9%); lower extremity deep vein thrombosis without concurrent pulmonary embolism was diagnosed in 157 individuals (45.8%); and VTE in another location was diagnosed in 25 individuals (7.3%). The most common risk factors for VTE were recent hospitalization and concurrent malignancy.

    CONCLUSION: The incidence of VTE was 167 per 100,000 person years and increased with age. The incidence was highest among older women. Pulmonary embolism was the most common form of VTE; it affected 47% of individuals with VTE. Malignancy and hospitalization were the most prevalent risk factors for VTE.

  • 3.
    Modica, Angelo
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Karlsson, Fredrik
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    Mooe, Thomas
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine.
    The impact of platelet function or C-reactive protein, on cardiovascular events after an acute myocardial infarction2009In: Thrombosis Journal, ISSN 1477-9560, E-ISSN 1477-9560, Vol. 7, no 12Article in journal (Refereed)
    Abstract [en]

    Background Recurrent cardiovascular events following acute myocardial infarction (AMI) are common. The purpose of this study was to evaluate the impact of platelet aggregation, PFA-100 closure times and peak C-reactive protein (CRP), respectively, on the occurrence of death, myocardial infarction and ischemic cerebral events after an AMI. Furthermore, to examine the relationship between the platelet function tests and peak CRP.

    Methods Three hundred and thirty-four patients with AMI were included in the study. Platelet aggregation was analyzed by an aggregometer using laser light (PA-200). The state of high residual platelet reactivity was defined as normal closure times (PFA-100) during treatment with antiplatelet and antithrombotic drugs.

    Results The fourth quartile of peak CRP was associated with poorer outcome as compared to the first quartile in a multivariate Cox-regression analysis, with a hazard ratio of 2.0 (95% CI 1.1-3.7) for the occurrence of death, myocardial infarction and ischemic cerebral events. The fourth quartile of peak CRP (>64.6 mg/l) was associated with platelet aggregation (p < 0.001, adjusted R² = 0.13) and high residual platelet reactivity, in a multivariable model, with an odds ratio of 2.9 (CI 95% 1.3-6.8), as compared to the first quartile. Neither the highest quartile of platelet aggregation nor the state of high residual platelet reactivity predicted new cardiovascular events.

    Conclusions In patients with myocardial infarction, measured peak CRP is associated with new cardiovascular events. Despite an association with peak CRP neither more pronounced platelet aggregation nor PFA-100 closure times independently predict new cardiovascular events.

  • 4.
    Tynngård, Nahreen
    et al.
    Linköping University, Linköping, Sweden.
    Lindahl, Tomas L.
    Linköping University, Linköping, Sweden.
    Ramström, Sofia
    Linköping University, Linköping, Sweden.
    Assays of different aspects of haemostasis: what do they measure?2015In: Thrombosis Journal, ISSN 1477-9560, E-ISSN 1477-9560, Vol. 13, article id 8Article, review/survey (Refereed)
    Abstract [en]

    Haemostasis is a complex process affected by many factors including both cellular and plasma components. It is a multistep process starting with platelet adhesion to damaged endothelium and ending in clot fibrinolysis. There are several methods available to study different aspects of haemostasis including adhesion, aggregation, coagulation and fibrinolysis. This review describes the different methods, what aspects of haemostasis they measure and their limitations. Methods discussed include methods to study adhesion (e.g. PFA-100, cone and platelet(let) analyzer and perfusion chambers) and aggregation (e.g. Multiplate, VerifyNow and Plateletworks). Furthermore the principles behind viscoelastic haemostatic assays are presented as well as methods that can analyse aspects of haemostasis in plasma or platelet-rich-plasma samples (thrombin generation, overall haemostasis potential and Thrombodynamics Analyzer).

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