Blar i forfatter "Hansen, John-Bjarne"

Viser treff 41-60 av 96

    • Impact of a Vancomycin-Induced Shift of the Gut Microbiome in a Gram-Negative Direction on Plasma Factor VIII:C Levels: Results from a Randomized Controlled Trial 

      Grimnes, Gro; Bhoelan, Soerajja; Hindberg, Kristian; Davids, Mark; Nieuwdorp, Max; Mollnes, Tom E.; Michelsen, Annika Elisabet; Ueland, Thor; Brækkan, Sigrid K.; Hansen, John-Bjarne; Tichelaar, Ynse Ieuwe Gerardus Vladimir (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-24)
      Rationale - Inflammation is present in several conditions associated with risk of venous thromboembolism. The gut microbiome might be a source of systemic inflammation and activation of coagulation, by translocation of lipopolysaccharides from gram-negative bacteria to the systemic circulation.<p> <p>Objective - To investigate whether a vancomycin-induced shift of the gut microbiome in a gram-negative ...

    • Impact of Chronic Inflammation, Assessed by hs-CRP, on the Association between Red Cell Distribution Width and Arterial Cardiovascular Disease: The Tromsø Study 

      Lappegård, Jostein; Ellingsen, Trygve; Hindberg, Kristian; Mathiesen, Ellisiv B.; Njølstad, Inger; Wilsgaard, Tom; Løchen, Maja-Lisa; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-10)
      Red cell distribution width (RDW), a measure of variability in size of circulating erythrocytes, is associated with arterial cardiovascular disease (CVD), but the underlying mechanism remains unclear. We aimed to investigate the impact of chronic inflammation as measured by high sensitivity CRP (hs-CRP) on this relationship, and explore whether RDW could be a mediator in the causal pathway between ...

    • Impact of incident myocardial infarction on the risk of venous thromboembolism: the Tromsø Study 

      Balteskard Rinde, Ludvig; Lind, Caroline; Småbrekke, Birgit; Njølstad, Inger; Mathiesen, Ellisiv B.; Wilsgaard, Tom; Løchen, Maja-Lisa; Mathiesen Hald, Erin; Vik, Anders; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne; Rinde, Ludvig Balteskard (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-10)
      Background: Recent studies have demonstrated an association between venous thromboembolism (VTE) and arterial thrombotic diseases. <p> Objectives: We aimed to study the association between incident myocardial infarction (MI) and VTE in a prospective population-based cohort. <p> Methods: Study participants (n=29 506) were recruited from three surveys of the Tromsø Study (conducted in 1994-95, 2001-02 ...

    • Impact of incident venous thromboembolism on risk of arterial thrombotic diseases 

      Lind, Caroline; Flinterman, Linda E.; Enga, Kristin; Severinsen, Marianne T; Kristensen, Søren R; Brækkan, Sigrid Kufaas; Mathiesen, Ellisiv B.; Njølstad, Inger; Cannegieter, Suzanne C.; Overvad, Kim; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2013-11-22)
      BACKGROUND: Growing evidence supports an association between venous thromboembolism (VTE) and arterial thrombotic diseases (ie, myocardial infarction and ischemic stroke). We aimed to study the association between VTE and future arterial events and to determine the population attributable risk of arterial events by VTE in a large prospective cohort recruited from the general population. METHODS AND ...

    • Impact of preanalytical conditions on plasma concentration and size distribution of extracellular vesicles using Nanoparticle Tracking Analysis 

      Jamaly, Simin; Ramberg, Cathrine; Olsen, Randi; Latysheva, Nadezhda; Webster, Paul; Sovershaev, Timofey; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-21)
      Optimal pre-analytical handling is essential for valid measurements of plasma concentration and size distribution of extracellular vesicles (EVs). We investigated the impact of plasma preparation, various anticoagulants (Citrate, EDTA, CTAD, Heparin), and fasting status on concentration and size distribution of EVs measured by Nanoparticle Tracking Analysis (NTA). Blood was drawn from 10 healthy ...

    • Impact of prothrombotic genotypes on the association between family history of myocardial infarction and venous thromboembolism 

      Småbrekke, Birgit; Balteskard Rinde, Ludvig; Evensen, Line Holtet; Morelli, Vania Maris; Hveem, Kristian; Gabrielsen, Maiken Elvestad; Njølstad, Inger; Mathiesen, Ellisiv B.; Rosendaal, Frits Richard; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-24)
      <i>Background</i>: Family history of myocardial infarction (FHMI) is known to increase the risk of venous thromboembolism (VTE).<p> <p><i>Objectives</i>: To investigate the effect of prothrombotic genotypes on the association between FHMI and VTE in a case‐cohort recruited from a general population.<p> <p><i>Methods</i>: Cases with a first VTE (<i>n</i> = 1493) and a subcohort (<i>n</i> = ...

    • Impact of red cell distribution width on future risk of cancer and all-cause mortality among cancer patients – the Tromsø Study 

      Ellingsen, Trygve; Lappegård, Jostein; Skjelbakken, Tove; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10)

    • Impact of respiratory symptoms and oxygen saturation on the risk of incident venous thromboembolism-the Tromsø study. 

      Børvik, Trond; Evensen, Line; Morelli, Vania Maris; Melbye, Hasse; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-01-09)
      Background: Chronic obstructive pulmonary disease (COPD) is associated with risk of venous thromboembolism (VTE). It remains unknown whether individual respiratory symptoms and lowered oxygen saturation (SpO<sub>2</sub>), individually and in combination with COPD, affect the risk of VTE.<p> <p> Objectives: To investigate whether measures of respiratory impairments including respiratory symptoms ...

    • The increased risk of venous thromboembolism by advancing age cannot be attributed to the higher incidence of cancer in the elderly: the Tromsø study 

      Blix, Kristine; Brækkan, Sigrid Kufaas; Le Cessie, S.; Skjeldestad, Finn Egil; Cannegieter, Suzanne C.; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)

    • Ischemic Stroke and Risk of Venous Thromboembolism in the General Population: The Tromsø Study 

      Balteskard Rinde, Ludvig; Småbrekke, Birgit; Mathiesen, Ellisiv B.; Løchen, Maja-Lisa; Njølstad, Inger; Mathiesen Hald, Erin; Wilsgaard, Tom; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-11-07)
      <i>Background</i> - Even though clinical data support a relation between ischemic stroke and venous thromboembolism (VTE), the strength and time dependence of the association remain to be settled at the population level. We therefore aimed to investigate the association between ischemic stroke and VTE in a prospective population-based cohort.<p> <p><i>Methods and Results</i> - Participants (n=30 ...

    • Joint Effect of Carotid Plaque and C-Reactive Protein on First-Ever Ischemic Stroke and Myocardial Infarction? 

      Eltoft, Agnethe; Arntzen, Kjell Arne; Wilsgaard, Tom; Hansen, John-Bjarne; Mathiesen, Ellisiv B.; Johnsen, Stein Harald (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-05-17)
      Background: <br>The joint effect of atherosclerosis and CRP (C-reactive protein) on risk of ischemic stroke (IS) and myocardial infarction (MI) has been sparsely studied. The aim of this study was to explore whether CRP mediates the risk of events in subjects with prevalent carotid plaque, examine synergism, and test whether CRP and carotid plaque add to risk prediction beyond traditional risk ...

    • Joint Effect of Multiple Prothrombotic Genotypes and Obesity on the Risk of Incident Venous Thromboembolism 

      Frischmuth, Tobias; Hindberg, Kristian; Gabrielsen, Maiken Elvestad; Brumpton, Ben Michael; Hveem, Kristian; Brækkan, Sigrid Kufaas; Hansen, John-Bjarne; Morelli, Vania Maris (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-03)
      <p><b>Background</b> The impact of the combination of obesity and multiple prothrombotic genotypes on venous thromboembolism (VTE) risk remains unclear. <p><b>Objective</b> To investigate the joint effect of obesity and a genetic risk score (GRS) composed of established prothrombotic single nucleotide polymorphisms (SNPs) on VTE risk using a population-based case–cohort. <p><b>Methods</b> Cases ...

    • Joint effects of cancer and variants in the factor 5 gene on the risk of venous thromboembolism 

      Gran, Olga Vikhammer; Smith, Erin N.; Brækkan, Sigrid Kufaas; Jensvoll, Hilde; Solomon, Terry; Hindberg, Kristian; Wilsgaard, Tom; Rosendaal, Frits Richard; Frazer, Kelly A.; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-09)
      Venous thromboembolism occurs frequently in cancer patients. Two variants in the factor 5 gene (F5), rs6025 encoding for the factor V Leiden mutation R506Q, and rs4524 encoding K858R, have been found to be associated with venous thromboembolism. We assessed the joint effect of active cancer and these two F5 variants on venous thromboembolism risk in a case-cohort study. Cases with a first venous ...

    • A large-scale exome array analysis of venous thromboembolism 

      Lindström, Sara; Brody, Jennifer A.; Turman, Constance; Germain, Marine; Bartz, Traci M.; Smith, Erin N.; Chen, Ming-Huei; Puurunen, Marja; Chasman, Daniel; Hassler, Jeffrey; Pankratz, Nathan; Basu, Saonli; Guan, Weihua; György, Beata; Ibrahim, Manal; Empana, Jean-Philippe; Olaso, Robert; Jackson, Rebecca; Brækkan, Sigrid Kufaas; McKnight, Barbara; Deleuze, Jean-François; O'Donnell, Christopher J.; Jouven, Xavier; Frazer, Kelly A.; Psaty, Bruce M.; Wiggins, Kerri L.; Taylor, Kent; Reiner, Alexander P.; Heckbert, Susan R.; Kooperberg, Charles; Ridker, Paul; Hansen, John-Bjarne; Tang, Weihong; Johnson, Andrew D.; Morange, Pierre-Emmanuel; Trégouët, David A.; Kraft, Peter; Smith, Nicholas L.; Kabrhel, Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-19)
      Although recent Genome‐Wide Association Studies have identified novel associations for common variants, there has been no comprehensive exome‐wide search for low‐frequency variants that affect the risk of venous thromboembolism (VTE). We conducted a meta‐analysis of 11 studies comprising 8,332 cases and 16,087 controls of European ancestry and 382 cases and 1,476 controls of African American ancestry ...

    • Long-Term Incidence of Venous Thromboembolism in Cancer: The Scandinavian Thrombosis and Cancer Cohort 

      Gade, Inger Lise; Brækkan, Sigrid Kufaas; Næss, Inger Anne; Hansen, John-Bjarne; Cannegieter, Suzanne C.; Rosendaal, Frits Richard; Overvad, Kim; Hindberg, Kristian; Hammerstrøm, Jens; Gran, Olga Vikhammer; Tjønneland, Anne; Severinsen, Marianne T.; Kristensen, Søren R (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-06)
      The risk of venous thromboembolism (VTE) in patients who survive the first years after a cancer diagnosis after the acute effects of disease and treatment in comparison to a similar background population has been sparsely investigated. The aim of the study was to investigate if incidence rates (IRs) of VTE differed in patients who were alive at least 2 years after a cancer diagnosis without VTE ...

    • Myocardial infarction and future risk of cancer in the general population—the Tromsø Study 

      Rinde, Ludvig Balteskard; Småbrekke, Birgit; Mathisen Hald, Erin; Brodin, Ellen Elisabeth; Njølstad, Inger; Mathiesen, Ellisiv B.; Løchen, Maja-Lisa; Wilsgaard, Tom; Brækkan, Sigrid Kufaas; Vik, Anders; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-07)
      The association between myocardial infarction (MI) and future risk of incident cancer is scarcely investigated. Therefore, we aimed to study the risk of cancer after a first time MI in a large cohort recruited from a general population. Participants in a large population-based study without a previous history of MI or cancer (n = 28,763) were included and followed from baseline to date of cancer, ...

    • Myocardial infarction as a transient risk factor for incident venous thromboembolism: Results from a population-based case-crossover study 

      Sejrup, Joakim Knutsen; Børvik, Trond; Grimnes, Gro; Isaksen, Trond; Hindberg, Kristian; Hansen, John-Bjarne; Morelli, Vania Maris; Brækkan, Sigrid Kufaas (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-16)
      Patients with myocardial infarction (MI) are at increased short-term risk of venous thromboembolism (VTE). The mechanisms behind this association are unclear. We aimed to investigate the impact of acute MI as a transient risk factor for incident VTE while taking other concomitant VTE risk factors into account. We conducted a case–crossover study of VTE patients (<i>n</i> = 707) recruited from the ...

    • Myocardial infarction, prothrombotic genotypes, and venous thrombosis risk: The Tromsø Study 

      Sejrup, Joakim Knutsen; Morelli, Vania Maris; Løchen, Maja-Lisa; Njølstad, Inger; Mathiesen, Ellisiv B.; Wilsgaard, Tom; Hansen, John-Bjarne; Brækkan, Sigrid Kufaas (Journal article; Tidsskriftartikkel; Peer reviewed; Master thesis; Mastergradsoppgave, 2020-01-27)
      <p><i>Background - </i>The risk of venous thromboembolism (VTE) is increased after a myocardial infarction (MI). Some prothrombotic genotypes associated with VTE have also been associated with risk of MI. Whether prothrombotic single‐nucleotide polymorphisms (SNPs) further increase the risk of VTE in MI patients is scarcely investigated. <p><i>Aim - </i>To study the combined effect of MI and ...

    • No significant effect on bone mineral density by high doses of vitamin D-3 given to overweight subjects for one year 

      Jorde, Rolf; Sneve, Monica; Torjesen, Peter A; Figenschau, Yngve; Hansen, John-Bjarne; Grimnes, Guri (Journal article; Tidsskriftartikkel; Peer reviewed, 2010)

    • Obesity measures and risk of venous thromboembolism and myocardial infarction 

      Horvei, Lars Daae; Brækkan, Sigrid Kufaas; Mathiesen, Ellisiv B.; Njølstad, Inger; Wilsgaard, Tom; Hansen, John-Bjarne (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)