Active clinical trials for "Thrombosis"

The purpose of this study is to characterize a new test to assess the rate and time it takes to form a blood clot in people who either do or do not take aspirin.

In patients undergoing coronary artery bypass graft (CAGB) surgery, aspirin is commonly prescribed to prevent graft thrombosis and myocardial ischemia. However, there are still a significant number of grafts occluding in the postoperative period. This is partly attributed to reduced aspirin responsiveness, also called "aspirin resistance". At the moment, no standardized definition or laboratory test is available to quantify "aspirin resistance", and strong platelet reactivity in laboratory tests is not necessarily associated with increased thrombotic events. However, there is increasing evidence that reduced aspirin responsiveness in platelet function analyzers is associated with adverse long-term outcome and higher incidence of major adverse events in patients with stable coronary artery disease and in patients undergoing percutaneous coronary intervention. In patients undergoing coronary artery bypass graft surgery, the predictive value of a laboratory finding of reduced aspirin responsiveness remains unclear. Therefore, the aim of this study is to prospectively evaluate whether the pre- and/or postoperative laboratory finding of reduced aspirin responsiveness defined by MultiplateTM platelet function analyzer is associated with higher incidences of adverse outcome after 30 days and 12 months in patients undergoing CABG surgery.

The objectives of this post-marketing surveillance, conducted in Japan, is to know the frequency, type and degree of device malfunction, to assure the safety of the medical device, and to collect information on evaluation of the efficacy and safety.

The issue to be studied is the prevalence of venous thromboembolism (VTE) in hospitalized pediatric patients, and to identify if there are subgroups of patients who may be at higher risk. There are two hypotheses that will be looked at in this study. The first hypothesis is that individual risk factors for VTE in hospitalized pediatric patients are: age >14, obesity, black race, female sex, presence of a central venous line (CVL), traumatic mechanism of injury, orthopaedic surgery, and use of oral contraceptives. The second hypothesis is that risk factors have an additive effect such that risk stratification can be developed to identify those patients with the highest risk.

The purpose of the study is to determine the Pharmacokinetics of Low Molecular Weight Heparin (LMWH) in Cancer patients, and compare it to the Pharmacokinetics of LMWH in Patients without cancer. We also intend to detect any correlation between heparanase blood and urine levels and the Pharmacokinetics of LMWH.

The objective of the EDVIGE study is to determine whether a negative single distal and proximal leg veins compression ultrasonography safely rules out the diagnosis of deep vein thrombosis in pregnant and post-partum women with clinical suspicion of DVT.

Deep vein thrombosis (DVT)is devastating disease which influencing the mortality and morbidity of patients at-risk like those undergoing orthopedic surgery. Recent publication suggested HMO-co-A reductase inhibitor (statin) may reduce the occurrence rate of venous thromboembolism in apparently healthy persons. The pleiotropic property of statin like antioxidant, antithrombotic, anti-inflammatory may have effect on the positive results. We are investigating whether rosuvastatin is associated with lower incidence of deep vein thrombosis (DVT) in patients undergoing total knee replacement arthroplasty(TKRA)who are at-high risk for developing DVT

Registry of Hospitalized patients at Brigham and Women's Hospital treated with Fondaparinux

To determine the effect of an interventional campaign run by a dedicated "VTE Nurse Educator" over a 6-month period and the effect on prophylaxis rates. To determine the proportion of medically admitted patients with risk factors for VTE. To assess and compare the use of venous thromboembolism (VTE) prophylaxis in hospitalized medical patients versus recommendations and current guidelines. To determine the patient characteristics of those deemed to be at risk of VTE. To determine the proportion of patients receiving appropriate thromboprophylaxis for their risk. To determine the type and duration (where possible) of prophylaxis used.

To evaluate physician response to human alerts that inform the clinician that his/her patient may be eligible for thromboprophylaxis. Medical records are reviewed to evaluate prescribing decision and to evaluate rates of venous thromboembolism.