View clinical trials related to Deep Vein Thrombosis.
Filter by:To determine whether d-dimer testing can be used to simplify and reduce the costs of the diagnostic approach to patients with clinically suspected deep vein thrombosis
The purpose of this study is to compare two diagnostic interventions to improve the way D-dimer blood testing (MDA D-dimer) is used to diagnose first time symptomatic deep vein thrombosis.
To determine whether treatment and further investigation can be safely withheld in patients who present with suspected recurrent deep vein thrombosis (DVT) and have either a (i) negative D-Dimer or (ii) a positive D-Dimer with normal serial compression ultrasound.
The assessment of patients with suspected deep vein thrombosis (DVT) is a common clinical scenario that, despite major advances in diagnostic testing, continues to be challenging. The diagnosis of DVT remains problematic in: - patients with suspected first DVT who have a moderate or high pre-test probability (PTP) for DVT and a normal compression ultrasound (CUS); - patients with suspected recurrent DVT; and - patients in whom CUS or contrast venography is technically difficult or not feasible due to patient characteristics. In patients with suspected first DVT who have a moderate or high PTP and a normal CUS, DVT occurs in up to 10% of cases. Thus, additional diagnostic testing is required, such as venography or serial CUS, so that DVT is not missed, but these approaches are costly and invasive. In patients with suspected recurrent DVT, currently used diagnostic approaches are problematic because they all have limitations in differentiating old disease from true recurrent disease. CUS is technically difficult in selected patients, particularly those who are obese. Contrast venography is the gold standard diagnostic test for DVT to which all other diagnostic venous imaging modalities for DVT are compared and judged. The Food and Drug Administration (FDA) requires that a new diagnostic test for DVT be assessed against venography. [99mTc] ThromboView® is a novel diagnostic test based on a 99mTc-labeled monoclonal antibody specific for D-dimer fragments of cross-linked fibrin that are found in acute DVT. After intravenous injection of [99mTc] ThromboView®, there is uptake of the monoclonal antibody by acute, D-dimer rich, venous thrombi. This is visualized with nuclear medicine imaging as an area of increased radioisotope activity that corresponds to the location of DVT. Based on the biologic and imaging characteristics of [99mTc] ThromboView®, this diagnostic test has the potential to: - identify small non-occlusive proximal DVT or distal DVT in patients with a moderate or high PTP and normal CUS; - differentiate old from new DVT in patients with suspected recurrent DVT; - diagnose or exclude DVT in patients in whom CUS is not technically feasible; and - provide an alternative to venography that is non-invasive, has no contrast-related toxicity and is easily administered. The present study is the first phase II clinical trial of [99mTc] ThromboView® in patients with suspected initial or recurrent DVT in whom DVT has been confirmed or excluded by venography. A phase II clinical trial to investigate the diagnostic accuracy of [99mTc] ThromboView® is justified because: - ThromboView® was well tolerated, with no significant toxicity in studies involving animals and healthy volunteers; and - it has shown promise in Phase I trials as a non-invasive diagnostic test for acute DVT.
Electrical stimulation of the foot can increase blood flow out of the leg. This increased blood flow can prevent blood clots from forming in the leg veins. Blood clots in the leg veins can break off and form life-threatening blood clots in the lungs. Intermittent external pneumatic (air) compression of the foot is already used to increase blood flow in at risk patients. Hypothesis: Electrical stimulation of the foot increases blood flow out of the legs to the same degree as intermittent external pneumatic (air) compression of the foot.
Patients diagnosed with pulmonary embolism (blood clot in the lung) or deep vein thrombosis (blood clot in a leg vein) are at risk for these blood clots to reoccur. Anticoagulant (blood-thinning) drugs are normally given immediately after the clot is discovered and are continued for a period of 3 or 6 months during which time the risk for recurrence is highest. Research has shown that when oral anticoagulants are used appropriately during this period, patients are less at risk for a recurrent blood clot and this risk reduction outweighs the potential for bleeding to occur. In this study, patients who had a blood clot in the lung or in a leg vein and completed 6 months of treatment with daily oral vitamin K antagonists (acenocoumarol or warfarin) or once-weekly injections of SR34006 (a new anticoagulant drug) will receive an additional 6 months of once-weekly SR34006 injections or injections of a solution containing no drug (placebo). This trial will evaluate whether patients treated for an additional 6 months with SR34006 have fewer recurrences of blood clots when compared to patients treated with placebo. Assignment to either SR34006 or placebo will be purely by chance. Neither the patients nor their doctors will know which treatment is being given.
Patients who have deep vein thrombosis (blood clot in the leg) will be treated in this study. The purpose of the study is to compare the safety and effectiveness of a new injectable anticoagulant (blood thinning) drug administered once each week, SanOrg34006, with the standard way of treating deep vein thrombosis. The standard treatment includes injections or infusions of an anticoagulant drug (Unfractionated Heparin or low molecular weight heparin) for about a week, followed by vitamin K antagonist (VKA) anticoagulant tablets (warfarin or acenocoumarol) which are taken by mouth. Eligible patients will be assigned to treatment with either SanOrg34006 or the combination of Unfractionated Heparin or low molecular weight heparin plus a VKA (warfarin or acenocoumarol) by random chance. Treatment will be known to both patients and their doctors.