Aspirin for the Prevention of Recurrent Venous Thromboembolism
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government.
Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00222677
Verified August 2011 by Cecilia Becattini, University Of Perugia. Recruitment status was: Active, not recruiting
To determine whether aspirin is more effective than placebo for the prevention of recurrent symptomatic venous thromboembolism when given for at least two years after the initial 6-12 month of oral anticoagulant therapy in patients with idiopathic venous thromboembolism
recurrence of VTE and/or VTE related death [ Time Frame: at least 24 months per patient ]
Secondary Outcome Measures
recurrent VTE+ death; cardiovascular events, bleeding events, critical ischemia of the lower limbs, mesenteric infarction, all cause mortality and newly diagnosed cancer [ Time Frame: at least 24 months per patient ]
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study:
18 Years and older (Adult, Senior)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
first episode of symptomatic, objectively confirmed idiopathic proximal deep vein thrombosis and/or pulmonary embolism;
initial treatment with unfractionated heparin or low-molecular-weight heparin (or effective alternative) followed by a vitamin K antagonist (target INR 2.0-3.0). All patients will receive 6 or 12 months of oral anticoagulant treatment. Patients initially treated with thrombolytic therapy who received warfarin therapy are eligible for inclusion.
permanent risk factors for venous thromboembolism: patients known to have antiphospholipid antibodies or lupus anticoagulant (based on local laboratory criteria) or to have homozygous factor V Leiden or homozygous prothrombin G21210A or heterozygous factor V Leiden plus heterozygous prothrombin G21210A or antithrombin III deficiency; patients with active malignancy
temporary risk factors for venous thromboembolism
any recurrence of venous thromboembolism or bleeding episode during the established 6-month period of oral anticoagulant treatment
allergy or intolerance of aspirin
clear indication for aspirin or other anti-platelet therapy (e.g. clopidogrel, ticlopidine)
treatment with non-selective COX-1/2 non-steroidal anti-inflammatory drugs
life expectancy less than 6 months
active bleeding or at high risk of bleeding (gastrointestinal bleeding within the past 12 months; endoscopic diagnosis of peptic ulcer disease or ulcerative esophagitis within the past 6 months unless there is documented endoscopic evidence of healing; intracranial bleeding within the past year; known bleeding diathesis)
anticipated non-adherence to study medications
inability to attend follow up because of geographic inaccessibility