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antithrombotics in venous thrombosis for secondary prevention of VTE , clinical trials results

apixaban 2.5mg versus discontinuation
AMPLIFY-EXT 2.5mg, 2012
NCT00633893
Extended Treatment with apixaban 2.5 mg twice daily 12 months
versus
placebo
patients who have completed their intended treatment for deep vein thrombosis or pulmonary embolism double blind
Follow-up duration: 12 mo
apixaban 5mg versus discontinuation
AMPLIFY-EXT 5mg, 2012
NCT00633893
Extended Treatment with apixaban 5 mg twice daily 12 months
versus
placebo
patients who have completed their intended treatment for deep vein thrombosis or pulmonary embolism double blind
Follow-up duration: 12 mo
aspirin versus discontinuation
WARFASA, 2012
NCT00222677
aspirin, 100 mg daily for 2 years
versus
placebo
patients with first-ever unprovoked venous thromboembolism who had completed 6 to 18 months of oral anticoagulant treatment double-blind
Follow-up duration: 24.6 mo (median)
ASPIRE, 2012
ACTRN12605000004662
aspirin, at a dose of 100 mg daily up to 4 years
versus
patients who had completed initial anticoagulant therapy after a first episode of unprovoked venous thromboembolism
Follow-up duration: 37.2 montsh (median)
dabigatran versus discontinuation
RE-SONATE, 2011
NCT00558259
dabigatran 150 mg twice daily for an additional period of 6 months
versus
placebo
Secondary prevention of VTE in patients with VTE who had completed 6-18 months of anticoagulant therapy double-blind
dabigatran versus warfarin
RE-MEDY, 2011
NCT00329238
dabigatran 150 mg twice daily for an additional period of 6 to 36 months
versus
warfarin (to maintain an international normalized ratio of 2.0 to 3.0) for an additional period of 6 to 36 months
Secondary prevention of VTE in patients with VTE who had initially received 3 to 12 months of anticoagulant therapy double-blind
Follow-up duration: 6 to 36 months
idraparinux versus discontinuation
VanGogh extension, 2007
NCT00071279
once-weekly injections of 2.5 mg of idraparinux for 6 months
versus
placebo
patients who had completed 6 months of prophylaxis with idraparinux or a vitamin K antagonist and in whom extended anticoagulation was warranted
Follow-up duration: 6 months
rivaroxaban versus discontinuation
EINSTEIN-extension, 2009
NCT00439725
rivaroxaban 20 mg once-daily for an additional 6 or 12 months
versus
placebo
patients who had completed six to 12 months of anticoagulant treatment for an acute episode of VTEdouble blind
28 countries
warfarin versus discontinuation
PROLONG (Palareti), 2006
NCT00264277
prolongation
versus
no anticoagulation
patients with an abnormal d-dimer level 1 month after the discontinuation of anticoagulation in patients with a first unprovoked proximal deep-vein thrombosis or pulmonary embolism who had received a vitamin K antagonist for at least 3 months
Follow-up duration: 1.4 yeras
PREVENT (Ridker), 2003
extension with low-intensity warfarin (target INR, 1.5 to 2.0)
versus
placebo
Patients with idiopathic venous thromboembolism who had received full-dose anticoagulation therapy for a median of 6.5 months
Follow-up duration: 2.1 years
Agnelli, 2003
continuation for 3 or 9 additionnal months of warfarin or other oral anticoagulant was adjusted to achieve a target INR between 2.0 and 3.0.
versus
discontinuation (after 3 months)
patients who had had 3 months of oral anticoagulant therapy without experiencing recurrence or bleeding after a first episode of pulmonary embolismopen
Follow-up duration: 33 months
Italy
Agnelli, 2001
continuation for 9 additional months; warfarin or acenocoumarol adjusted to achieve a target INR between 2.0 and 3.0
versus
discontinuation (after 3 months months)
Patients with a first episode of idiopathic proximal deep venous thrombosis who had completed three months of oral anticoagulant therapy open
Follow-up duration: 33 months
Italy
LAFIT (Kearon), 1999
Continuation of the oral anticoagulant therapy up to 24 months, warfarin was adjusted to achieve a target INR between 2.0 and 3.0.
versus
discontinuation (after 3 months)
patients who had completed 3 months of anticoagulant therapy for a first episode of idiopathic venous thromboembolism
Levine, 1995
continuation for 2 months of warfarin adjusted INR value of 2.0 to 3.0
versus
Discontinue oral anticoagulant therapy (after 1 months)
Patients with venographically confirmed acute proximal DVT who had received four weeks of warfarin after initial heparin and whose four week IPG was normal double blind
Follow-up duration: 11 months after randomization.
Canada, Italy
DURAC (Schulman), 1997
indefinite warfarin or dicoumarol adjusted for a target INR between 2.0 and 2.85
versus
6 months warfarin or dicoumarol adjusted for a target INR between 2.0 and 2.85
open
Follow-up duration: Four years after randomization
Sweden
ximelagatran versus discontinuation
THRIVE III, 2003
ximelagatran 24 mg twice daily for 18 months
versus
placebo for 18 months
patients with venous thromboembolism who had undergone six months of anticoagulant therapydouble blind
Follow-up duration: 18 months
18 countries

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