Clive Kearon

..A systematic approach to managing warfarin therapy improves its efficacy, safety, and acceptability...

..Antiphospholipid antibodies are considered acquired thrombophilic states. Testing for these abnormalities is widespread. This review will consider if the results of testing should influence how patients with VTE are treated...

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..7; 95% CI, 0.2-2.3) or more than one (HR, 0.7; 95% CI, 0.2-3.4) defect. We conclude that single or multiple thrombophilic defects are not associated with a higher risk of recurrent VTE during warfarin therapy...

..Although a number of factors are associated with a reduced risk of recurrence, they require further validation before it is appropriate to routinely stop anticoagulants after 3 months in patients with idiopathic proximal DVT or PE...

..If anticoagulant drug therapy is stopped after 7 to 10 days, an additional month of prophylaxis with aspirin should be considered...

..Retrospective analyses suggest that 1 month of anticoagulation is adequate for patients whose venous thromboembolic event was provoked by a transient risk factor...

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..It may be safe to omit additional diagnostic testing in selected patients with suspected pulmonary embolism (PE) who have a negative D-dimer test, but this approach has never been evaluated in a randomized, controlled trial...

..For extensive superficial vein thrombosis, we recommend treatment with prophylactic or intermediate doses of LMWH or intermediate doses of UFH for 4 weeks (Grade 1B)...

..Oral direct thrombin inhibitors also appear suitable for long-term prevention of recurrent VTE but await regulatory approval and comparison with VK antagonists...

..This study was performed to identify an effective and safe dose of ART-123 for prevention of venous thromboembolism after elective, unilateral total hip replacement...

..These two requirements are a barrier to treatment of venous thromboembolism with unfractionated heparin, and it is uncertain if they are necessary...

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..CLOTS 1 and CLOTS 2 question whether graduated compression stockings prevent VTE and suggest the need for further trials evaluating their efficacy in medical and surgical patients...

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..This guideline focuses on the identification of optimal strategies for the diagnosis of DVT in ambulatory adults...

..Based on our low rate of observed major bleeding we conclude that 2.5 mg of oral vitamin K is a reasonable treatment for patients with INR values of more than 10 who are not actively bleeding...

..0. However, there are no prospective data to support this approach to thromboprophylaxis...

..TRIAL REGISTRATION: clinicaltrials.gov Identifier: NCT00182403...

..This article addresses the treatment of VTE disease...

..The low-intensity warfarin regimen does not reduce the risk of clinically important bleeding...

..Low-dose oral vitamin K decreases the international normalized ratio (INR) in overanticoagulated patients who receive warfarin therapy. Its effects on bleeding events are uncertain...

..0-3.0 is effective for the prevention of VTE. However, because stroke is a major risk factor for bleeding with warfarin, a less intense regimen (target INR < 2.0), might safely prevent VTE in stroke rehabilitation patients...

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..Good communication between all of these parties is essential to ensure that an optimal management strategy is identified and executed...

..Few studies have assessed the effect of prothrombotic blood abnormalities on the risk of deep vein thrombosis (DVT) with hormone replacement therapy (HRT)...

..Some patients develop fatigue while taking warfarin, but causality is uncertain...

..Thrombolytic therapy increases the risk of major bleeding 1.5-fold to threefold in patients with acute venous thromboembolism, ischemic stroke, or ST-elevation myocardial infarction...

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..However, there is inadequate data from studies that directly compared once-daily and twice-daily administration to be able to exclude the possibility of a higher frequency of fatal bleeding with once-daily therapy...

..Preceding this is a brief description of the therapies most commonly used in the perioperative period. The prevention of arterial thromboembolism is considered separately from the prevention of venous thrombosis...

..Because clinical diagnosis is inaccurate, objective testing is usually considered necessary when patients present with suspected deep venous thrombosis (DVT)...

..The direct oral thrombin inhibitor dabigatran has a predictable anticoagulant effect and may be an alternative therapy to warfarin for patients who have acute venous thromboembolism...

..The data obtained will clarify the role of extended-duration LMWH therapy in patients with and without cancer and may result in the development of novel antithrombotic agents that overcome the limitations of current therapies...

..Preoperative low-molecular-weight heparin (LMWH) is often used when warfarin therapy is interrupted for surgery...

..2; SD 6.3) compared to control (15.0; SD 6.1). In conclusion, Venowave appears to be a very promising new therapy for patients with severe PTS, which may be used alone or in combination with graduated compression stockings...

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..The clinical impact of these findings is unknown, and can only be assessed through a prospective trial...

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..Warfarin reduces the risk of stroke in patients with atrial fibrillation but increases the risk of hemorrhage and is difficult to use. Dabigatran is a new oral direct thrombin inhibitor...

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..We aimed to determine the risk of recurrence for symptomatic venous thromboembolism (VTE) provoked by different transient risk factors...

..We aimed to test the efficacy and safety of oral rivaroxaban for the prevention of venous thromboembolism after total knee arthroplasty...

..Catheter-directed thromboylsis, particularly for isolated iliofemoral thrombosis, may be beneficial and needs further evaluation in controlled trials...

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..The intention is to also seek approval of this definition from the regulatory authorities...

..Although hormone replacement therapy (HRT) is associated with an increased risk of deep vein thrombosis (DVT), it is not clear if the risk differs in users of combined estrogen-progestin HRT and estrogen-only HRT...

..The presence of an association between early subtherapeutic activated partial thromboplastin times (aPTTs) and recurrent venous thromboembolism (VTE) remains controversial...

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..These strategies may help to achieve the benefits of expert input without conflicts of interest influencing recommendations...

..Helical CT and MRI are rapidly improving as diagnostic tests for pulmonary embolism and are expected to become central to its evaluation...

..Elevated total homocysteine levels are associated with a higher risk for venous thromboembolism. Whether decreasing homocysteine levels with vitamin therapy reduces the risk for venous thromboembolism is not known...

..Risk factors for a first episode of VTE are generally also risk factors for recurrence, although the associated relative risk for thrombosis may differ for a first and subsequent event...

..0-98.6) to 89.4% (95% confidence interval, 83.7-95.1). There is a decrease in D-dimer levels in patients with acute VTE 24 h after starting heparin therapy that is expected to result in a clinically important drop in sensitivity...

..This test has an anatomic component to locate DVT and a functional component to differentiate acute (newly formed) thrombus from inactive (old) thrombus...

..However, whether each of these factors additively increases the risk of VTE is uncertain...

..9% to 100%]). CONCLUSION: The combination of a low pretest probability of deep venous thrombosis and a negative result on a whole-blood D -dimer test rules out deep venous thrombosis in a large proportion of symptomatic outpatients...

..Coupled with the comparatively low accuracy of noninvasive testing for asymptomatic DVT, this suggests that the results of such testing are unsuitable for the evaluation of new methods of prophylaxis in clinical trials...

..The SimpliRED D-dimer was found to be less sensitive than the Accuclot or IL-Test. When combined with pre-test probability all three methods are probably acceptable for use in the diagnosis of venous thromboembolism...

..Use of three pretest probability-specific D-dimer cut-off points rather than a single D-dimer cut-off point for all patients, has the potential to increase the utility of D-dimer testing for the diagnosis of venous thromboembolism...

..As assessment of clinical pretest probability is the first step in the diagnostic evaluation of deep vein thrombosis (DVT), it is important to know if the clinical features of DVT are the same in men and women...

..Although D-dimer assays have high negative predictive values for the diagnosis of deep venous thrombosis, their accuracy in patients with cancer is uncertain...

..The combination of a score < or =4.0 by our simple clinical prediction rule and a negative SimpliRED D-Dimer result may safely exclude PE in a large proportion of patients with suspected PE...

..In terms of treatment decision making for anticoagulant therapy, bleeding risk cannot be considered alone, ie, the potential decrease in thromboembolism must be balanced against the potential increased bleeding risk...

..We did a meta-analysis to assess from available evidence whether men and women have the same risk of recurrent venous thromboembolism after stopping anticoagulant treatment...

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..FVL is associated with a two- to threefold increase in VTE in first-degree relatives of patients with VTE. No subgroup of relatives was identified who require more than routine prophylaxis because of a particularly high risk of VTE...