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  • 1.
    Björck, Fredrik
    et al.
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Kadhim, Hayder
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Själander, Anders
    Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Section of Medicine.
    Predictors for INR-control in a well-managed warfarin treatment setting2019In: Journal of Thrombosis and Thrombolysis, ISSN 0929-5305, E-ISSN 1573-742X, Vol. 47, no 2, p. 227-232Article in journal (Refereed)
    Abstract [en]

    Warfarin is well studied in patients with non-valvular atrial fibrillation (AF). It has low complication rates for patients achieving individual Time in Therapeutic Range (iTTR)>70%. The risk scores SAMe-TT2R2 and PROSPER are designed to predict future TTR, but are derived from a heterogeneous population with generally low iTTR. The aim of this study was to evaluate predictors for high and low iTTR in an AF population in Sweden, where there is a generally good anticoagulation control. A retrospective register study based on Swedish warfarin dosing system AuriculA, including 28,011 AF patients starting treatment during 1 January 2006 to 31 December 2011. Complications and risk factors were analysed and related to iTTR. Mean age was 73.7 (SD +/- 9.5) years, with 42.0% women. Mean CHA(2)DS(2)-VASc score (SD) was 3.6 (+/- 1.7). For patients with iTTR<60% there were over three times higher prevalence of excessive alcohol consumption than for patients with iTTR>70% (3.7% vs. 1.1%). Previous stroke were more prevalent for patients with high than low iTTR (17.1% vs. 20.3%). Concomitant comorbidities were associated with increased risk of poor iTTR. In Swedish AF patients, excessive alcohol use is clearly associated with iTTR below 60%. Patients with previous stroke are more likely to get iTTR above 70%, unlike those with concomitant disorders who more often have poor anticoagulation control. The SAMe-TT2R2-score cannot be applied in Sweden.

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