Seminars in Thrombosis and Hemostasis

Publisher: Georg Thieme Verlag

Journal description

Current impact factor: 3.69

Impact Factor Rankings

2015 Impact Factor Available summer 2015
2013 / 2014 Impact Factor 3.693
2012 Impact Factor 4.216
2011 Impact Factor 4.524
2010 Impact Factor 4.169
2009 Impact Factor 3.214
2008 Impact Factor 3.695
2007 Impact Factor 3.202
2006 Impact Factor 2.733
2005 Impact Factor 2.077
2004 Impact Factor 2.018
2003 Impact Factor 1.906
2002 Impact Factor 2.497
2001 Impact Factor 2.147
2000 Impact Factor 2.179
1999 Impact Factor 2.385
1998 Impact Factor 1.577
1997 Impact Factor 1.171
1996 Impact Factor 1.15
1995 Impact Factor 1.175
1994 Impact Factor 1.483
1993 Impact Factor 1.415
1992 Impact Factor 1.542

Impact factor over time

Impact factor
Year

Additional details

5-year impact 3.84
Cited half-life 5.20
Immediacy index 2.00
Eigenfactor 0.01
Article influence 1.06
ISSN 1098-9064
OCLC 163849709
Material type Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Georg Thieme Verlag

  • Pre-print
    • Author cannot archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • On author's personal website immediately
    • On Institutional Repository and PubMed Central after 12 months embargo
    • Publisher's version/PDF can be used on author's personal website only
    • Publisher copyright and source must be acknowledged
    • Link to Publisher version (www.thieme-connect.com) must be included if article has been published online
    • 'Georg Thieme Verlag' is an imprint of 'Thieme Publishing'
  • Classification
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: It is now clear that homocysteine (Hcy) is irreversibly degraded to hydrogen sulfide (H2S), an endogenous gasotransmitter that causes in vivo platelet activation via upregulation of phospholipase A2 and downstream boost of the arachidonate cascade. This mechanism involves a transsulfuration pathway. Based on these new data, clinical and experimental models on the relationships between Hcy and folate pathways in vascular disease and information on the Hcy controversy have been reanalyzed in the present review. Most interventional trials focused on Hcy lowering by folate administration did not exclude patients routinely taking the arachidonate inhibitor aspirin. This may have influenced the results of some of these trials. It is also clear that nutritional intake of folate affects several enzymatic reactions of the methionine-Hcy cycle and associated one-carbon metabolism and, thereby, both methylation reactions and redox balance. Hence, it is conceivable that the abnormally high Hcy levels seen in pathologic states reflect a poorly elucidated perturbation of such reactions and of such balance. While it is unknown whether there is an interplay between H2S, methylation reactions, and redox balance, measuring the sole reduction of blood Hcy that follows folate administration may well be an oversimplified approach to a complex biologic perturbation. The need to investigate this complex framework is thoroughly discussed in this article. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 05/2015; DOI:10.1055/s-0035-1549848
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    ABSTRACT: Factor VII (FVII) deficiency is one of the two congenital coagulation disorders that was not discovered by the description of a new bleeding patient whose clotting pattern did not fit the blood coagulation knowledge of the time (the other is factor XIII deficiency). The existence of an additional factor capable of accelerating the conversion of prothrombin into thrombin was suspected before 1951, the year in which the first family with FVII deficiency was discovered. As several investigators were involved in the discovery of FVII deficiency from both sides of the Atlantic, several different names were tentatively suggested to define this entity, namely stable factor (in contrast with labile factor or FV), cothromboplastin, proconvertin, serum prothrombin conversion accelerator, prothrombin acceleration, and autoprothrombin I. The last term was proposed by those who denied the existence of this new entity, which was instead considered to be a derivate of prothrombin activation, namely autoprothrombin. The description of several families, from all over the world, of the same defect, however clearly demonstrated the singularity of the condition. Factor VII was then proposed to define this protein. In subsequent years, several variants were described with peculiar reactivity toward tissue thromboplastins of different origin. Molecular biology techniques demonstrated several gene mutations, usually missense mutations, often involving exon 8 of the FVII gene. Later studies dealt with the relation of FVII with tissue factor and activated FVII (FVIIa). The evaluation of circulating FVIIa was made possible by the use of a truncated form of tissue factor, which is only sensitive to FVIIa present in the circulation. The development of FVII concentrates, both plasma derived and recombinant, has facilitated therapeutic management of FVII-deficient patients. The use of FVIIa concentrates was noted to be associated with the occasional occurrence of thrombotic events, mainly venous. Total or partial liver transplants have been performed with success in these patients and have "cured" their deficiencies. Prenatal diagnosis has also been performed and recent research involves the development of inhibitors of FVII + tissue factor complex or of FVIIa. This approach, if successful, could provide another antithrombotic therapeutics tool. The story of FVII well summarizes the efforts of both theoretical and clinical approaches in the characterization of a coagulation disorder, that is, among the rare bleeding conditions, most frequently encountered in clinical practice. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 05/2015; DOI:10.1055/s-0035-1549851
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    ABSTRACT: Staphylococcus aureus is a leading cause of skin and soft tissue infections, foreign body infections, and infective endocarditis. In case of endovascular infection with S. aureus, higher rates of cardiac valve destruction, embolic complications, severe sepsis, and death occur. The unique capacity of S. aureus to induce clotting has been known for over a century; however, its role in virulence has long been controversial. S. aureus secretes two coagulases, staphylocoagulase and von Willebrand factor binding protein that both activate prothrombin to generate fibrin. A better understanding of the molecular mechanisms as well as the new strategies to target the coagulases have highlighted their importance in S. aureus virulence. Coagulase activity is essential for the formation of S. aureus-fibrin-platelet microaggregates and for the homing of S. aureus to the vascular wall under flow. Absence or inhibition of S. aureus coagulase activity improved outcome in disease models of skin infection, sepsis, catheter infection, and endocarditis. Here, we review how the manipulation of the host's hemostatic system contributes to the disease-causing potential of S. aureus and discuss the S. aureus coagulases as promising targets for novel therapeutic strategies. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 05/2015; DOI:10.1055/s-0035-1549849
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    ABSTRACT: Direct oral anticoagulants (DOACs) have changed the paradigm of anticoagulation management, improving patient convenience as well as possibly reducing the incidence of spontaneous intracranial hemorrhage. However, concerns remain with these agents because of the lack of monitoring capacity and availability of readily accessible specific antidotes. This is particularly pertinent in the older population, specifically the frail older adults who have multiple comorbidities, higher risk of falls, and increased bleeding risk. This group has not been specifically studied in the DOAC randomized controlled trials and, hence, extrapolation of these data into this population should be done cautiously. We provide a review of the use of DOACs in the older frail population from both hematological and geriatric perspectives, as well as propose an algorithm for how these agents may be used in this frail population. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 05/2015; DOI:10.1055/s-0035-1550158
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    ABSTRACT: Microparticles (MPs) are irregularly shaped small vesicles of heterogeneous size released from the plasma membrane in a tightly controlled process, after different stimuli. MPs have been associated with proinflammatory effects and also with autoimmune processes, being a source of autoantigenic nuclear material, which can form immune complexes. In addition, recent reports have linked a large number of autoimmune disorders to an increased risk of thrombosis, and MPs seem to promote the potential for thrombotic events. A growing mass of evidence supports the idea that MPs could contribute to the generation of an inflammation-induced hypercoagulability state, having a relevant role in the pathogenesis of the thrombotic phenomena associated to autoimmune disease, such as systemic lupus erythematosus, antiphospholipid antibody syndrome, and systemic vasculitis. In this review, we focus on the procoagulant properties of circulating MPs and analyze their contribution to the pathogenesis of autoimmune diseases. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 05/2015; DOI:10.1055/s-0035-1549850
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    ABSTRACT: Treatment in hemophilia is designed to reduce bleed frequency, minimize joint damage, and maximize functional independence and quality of life. Therefore, success of a factor replacement protocol is usually gauged by its ability to produce near "normal joints"-without any significant pathology. The most commonly used outcome measurement tools are based on the radiological and clinical assessment of joint arthropathy. To improve the sensitivity to early changes, the clinical scores have been refined, and imaging based on magnetic resonance imaging and ultrasonography has been initiated. Although these scores are useful in assessing the structure and function of a joint, they do not consider the impact of arthropathy on overall musculoskeletal function. They are also not capable of assessing the efficacy of interventions on functional independence, participation in life activities, and quality of life. The development of functional scores such as the Functional Independence Score for Hemophilia, the pediatric Hemophilia Activities List, and some quality of life measurement tools have helped provide a more comprehensive assessment of health. This article describes the psychometric properties and limitations of the various clinimetric tools that are used to assess musculoskeletal outcome in hemophilia and suggests an algorithm for their use in clinical practice. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; DOI:10.1055/s-0034-1543997
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    ABSTRACT: Factor X (FX) plays a pivotal role in blood coagulation. FX represents the point where all coagulation systems converge and, once activated, it converts prothrombin into thrombin. The discovery and definition of FX are based on the description between 1956 and 1957 about three patients and their families with a peculiar defect later demonstrated to be almost identical. These patients were an American (Mr. Stuart), a British (Ms. Prower), and a Swiss with Italian background (infant Delia B). We stated "almost identical" because immunological and molecular biology studies subsequently revealed that even though the basic clotting defect was identical, the FX protein level and the mutation were different in each case. Mr. Stuart had no FX protein in his plasma and the mutation was Val298Met (homozygote). Ms. Prower instead had a normal level of FX protein and the mutation was Arg287Trp + Asp282Asn (compound heterozygote). Unfortunately, the status of the Swiss patient in this regard is not known. Subsequent studies described a few major variants (FX Friuli, FX Melbourne, FX Padua, and other similar patients), which showed peculiar activation patterns (FX Friuli had a normal Russell viper venom clotting time; FX Melbourne was defective only in the intrinsic coagulation system; FX Padua, on the contrary, was defective only in the extrinsic coagulation system). All these studies have informed on the great heterogeneity and complexity of the FX defect. The story of the discovery and classification of FX deficiency has contributed considerably to our understanding of blood coagulation. The three original families and the families of the major variants, together with the researchers that discovered them, should be remembered with deep respect and gratitude. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; DOI:10.1055/s-0034-1544000
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    ABSTRACT: Cardiovascular disease (CVD) is the leading cause of death worldwide. Platelet activation and aggregation play a central role in hemostasis and thrombosis. Herbal medicines have been traditionally used in the management of CVD and can play a role in modifying CVD progression, particularly in platelet function, and have the potential of altering platelet function tests, as well as some coagulation parameters. Herbal medicines, such as feverfew, garlic, ginger, ginseng, motherwort, St John's wort, and willow bark, were found to reduce platelet aggregation. In vitro studies show promise in the reduction of platelet aggregation for Andrographis, feverfew, garlic, ginger, Ginkgo, ginseng, hawthorn, horse chestnut, and turmeric. In addition, cranberry, danshen, dong quai, Ginkgo, ginseng, green tea, and St John's wort were found to have potential interactions with warfarin. Furthermore, St John's wort interacted with clopidogrel and danshen with aspirin. Therefore, repeat testing of platelet function and coagulation studies, particularly for patients on warfarin therapy, may be required after exclusion of herbal medicines that could have possibly affected initial test results. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; 41(03). DOI:10.1055/s-0035-1549089
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    ABSTRACT: To accurately estimate longitudinal changes in individuals, it is important to take into consideration the biological variability of the measurement. The few studies available on the biological variations of coagulation parameters are mostly outdated. We confirmed the published results using modern, fully automated methods. Furthermore, we added data for additional coagulation parameters. At 8:00 am, 12:00 pm, and 4:00 pm on days 1, 3, and 5, venous blood was collected from 31 healthy volunteers. A total of 16 parameters related to coagulation screening tests as well as the activity of coagulation factors were analyzed; these included prothrombin time, fibrinogen (Fbg), activated partial thromboplastin time, thrombin time, international normalized ratio, prothrombin time activity, activated partial thromboplastin time ratio, fibrin(-ogen) degradation products, as well as the activity of factor II, factor V, factor VII, factor VIII, factor IX, and factor X. All intraindividual coefficients of variation (CVI) values for the parameters of the screening tests (except Fbg) were less than 5%. Conversely, the CVI values for the activity of coagulation factors were all greater than 5%. In addition, we calculated the reference change value to determine whether a significant difference exists between two test results from the same individual. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; 41(03). DOI:10.1055/s-0034-1543994
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    ABSTRACT: The monitoring of warfarin therapy using the international normalized ratio (INR) has now moved outside the laboratory's control by use of point-of-care (POC) devices. Although this provides patients with the convenience of immediate results and clinical assessment, POC-INRs are often performed by nonlaboratory staff with little experience in quality control. The Royal College of Pathologists of Australasia Quality Assurance Program (RCPAQAP) Haematology has devised a POC-INR external quality assessment (EQA) program that is suitable for both laboratory and nonlaboratory operators (e.g., nurses) to perform INR testing with good accuracy and precision. A comparison of the performance of the POC versus the laboratory-derived INR testing over the past 8 years has shown that the variation in test results (expressed as coefficient of variation; CV) for laboratory INRs increases with more prolonged INR values, whereas CVs for the POC-INR testing were generally lower, with a reduced dependency on INR values. In our program, the CoaguChek XS (Roche, Basel, Switzerland) showed the best performance among the POC devices. A comparative assessment with other EQA providers showed agreement and disparity with our data in terms of comparative CVs obtained between the laboratory and POC-INRs. The growth of the RCPAQAP POC-INR program from 29 to 360 in the past 12 years highlights the importance of providing suitable EQA for POC-INR staff who are unfamiliar with laboratory practice. This helps maintaining consistent results, which have important implications for the therapeutic management of patients on vitamin K antagonist therapy. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; 41(03). DOI:10.1055/s-0035-1549091
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    ABSTRACT: Rapid evaluation of fibrinogen (Fbg) levels is essential for maintaining homeostasis in patients with massive bleeding during severe trauma and major surgery. This study evaluated the accuracy of fibrinogen levels measured by the CG02N whole blood coagulation analyzer (A&T Corporation, Kanagawa, Japan) using heparinized blood drawn for blood gas analysis (whole blood-Fbg). A total of 100 matched pairs of heparinized blood samples and citrated blood samples were simultaneously collected from patients in the intensive care unit. Whole blood-Fbg results were compared with those of citrated plasma (standard-Fbg). The whole blood coagulation analyzer measured fibrinogen levels within 2 minutes. Strong correlations between standard-Fbg and whole blood-Fbg were observed (ρ = 0.91, p < 0.001). Error grid analysis showed that 88% of the values were clinically acceptable, and 12% were in a range with possible effects on clinical decision-making; none were in a clinically dangerous range without appropriate treatment. Using a fibrinogen cutoff value of 1.5 g/L for standard-Fbg, the area under the receiver operating characteristic curve of whole blood-Fbg was 0.980 (95% confidence interval 0.951-1.000, p < 0.001). The whole blood coagulation analyzer can rapidly measure fibrinogen levels in heparinized blood and could be useful in critical care settings where excessive bleeding is a concern. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 04/2015; 41(03). DOI:10.1055/s-0035-1547372
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    ABSTRACT: Primary immune thrombocytopenia (ITP) in adults often assumes a chronic course that requires persistent monitoring and treatment. Medical therapy has traditionally been viewed as a means of temporarily raising the platelet count with little or no potential to induce long-term platelet responses off treatment. However, several recent studies have tested the hypothesis that intensive medical therapy administered early in the disease course may ameliorate or even cure ITP. In this review, we propose a biological rationale for medical intervention that simultaneously targets the innate and adaptive immune responses administered early in the course of disease. We also critically examine data on long-term outcomes after single-agent and multi-agent medical therapy. Intensive regimens that target inflammation and adaptive immunity (e.g., combination high-dose dexamethasone and rituximab) appear to improve response rates at 6 to 12 months compared with standard first-line therapy (e.g., prednisone, high-dose dexamethasone alone) in newly diagnosed patients. Controlled trials with extended follow-up are needed to determine whether these intensive regimens induce more cures compared with standard treatment or merely delay relapse at the expense of potentially greater toxicity. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 03/2015; DOI:10.1055/s-0034-1544001
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    ABSTRACT: Point-of-care (POC) testing within hemostasis is an expanding field, with the most widely used test being POC international normalized ratio (INR). Many of these devices are being used in a nonlaboratory setting by staff with no laboratory training. In the United Kingdom, external quality assessment (EQA) is provided by the organization UK National External Quality Assessment Scheme for Blood Coagulation (UK NEQAS BC). Participants within the UK NEQAS BC POC INR program are largely based in primary care (77%), with the majority of EQA samples and patients tests being performed by nurses (70%). Many of these centers do not have support from the laboratory staff and may, therefore, not understand the requirement for a robust quality control (QC) system comprising both internal quality control (IQC) and EQA. From data acquired through a questionnaire of these UK NEQAS BC users, we observed that 2% of the centers never perform IQC tests, only 29% perform IQC tests when starting a new batch of test strips, and just 15% carry out IQC with each clinic as recommended by the UK guidelines. The imprecision of EQA tests was greater for POC users than in the UK NEQAS BC hospital laboratory program, with average coefficients of variation for a 2-year period of 11.0 and 7.3%, respectively. This may reflect the handling of EQA samples rather than the imprecision of the method, due to the lack of laboratory training amongst POC staff. POC INR in the UK could greatly benefit from more interaction and support from laboratories to these POC testers. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 03/2015; 41(03). DOI:10.1055/s-0035-1544197
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    ABSTRACT: Anticoagulant treatment can be currently instituted with two different classes of drugs: the vitamin K antagonists (VKAs) and the newer, "novel" or non-vitamin K antagonist oral anticoagulant drugs (NOACs). The NOACs have several practical advantages over VKAs, such as the rapid onset/offset of action, the lower potential for food and drug interactions, and the predictable anticoagulant response. However, the VKAs currently have a broader spectrum of indications, a standardized monitoring test, and established reversal strategies. The NOACs emerged as alternative options for the prevention and treatment of venous thromboembolism and for the prevention of stroke and systemic embolism in patients with nonvalvular atrial fibrillation. Nevertheless, there remain some populations for whom the VKAs remain the most appropriate anticoagulant drug. This article discusses the advantages and disadvantages of VKAs and NOACs. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.
    Seminars in Thrombosis and Hemostasis 02/2015; DOI:10.1055/s-0035-1544231