Active clinical trials for "Thrombosis"

The purpose of this study is to determine whether elastic compression stockings used for 2 years are effective in preventing the post-thrombotic syndrome in patients with symptomatic proximal deep venous thrombosis.

A multicentre cross-sectional cohort study to assess the difference in bioprosthetic micro-calcification activity, detected with 18F-NaF PET-CT, as early marker of transcatheter valve degeneration, between patients with vs. without subclinical leaflet thrombosis at five years after TAVI; and between patients with intra-annular vs. supra-annular TAVI prostheses.

study the risk factors of thrombosis in thrombosed arteriovenous fistula in patients on regular hemodialysis

This study aims to assess the knowledge and provide an opportunity for education to clinician attendees of the Canadian Cardiovascular Congress (CCC) meeting using a series of simulated patient case scenarios.

Oncology and hemotology patients under anticancer treatments are exposed to increased risks of central venous catheter-related complications due to the underlying cancer and its treament. This prospective observational monocentric french study aims at describing the incidence of such complications, their morbimortality, and analyzing some risk factors in order to contribute to propose some strategies to reduce these complications' rate and consequences

To study thrombin generation parameters in critically ill patients with and without central line related thrombosis (CRT).

The PROGRESS is an investigator-initiated, multicentre, randomized, trial comparing anticoagulation, which is the currently most frequently used treatment, alone, versus transjugular intrahepatic portosystemic shunt (TIPS) combined with anticoagulation, in patients presenting with recent obstructive portal vein thrombosis (ROPVT). The rationale of this study is to significantly increase the proportion of patients that achieve a complete or partial recanalization of the portal vein. The intervention of this study consists in TIPS deployment and catheter based clot removal in addition to anticoagulation. The investigators retain that this intervention will increase the proportion of patients with an open portal vein from 38% with anticoagulation alone to 83% with anticoagulation and TIPS after 6 months. Both anticoagulant therapy and clot removal/TIPS are treatments that are currently available and accepted indications for the treatment of ROPVT. Anticoagulation will be performed with unfractioned heparin or low molecular weight heparin initially and with vitamin K antagonists in the long term. The investigators plan to collect blood for biobanking at the time of inclusion and after 6 months. Blood samples for a biobank will be collected.

Splenic/portal vein thrombosis is an alarming complication of splenectomy. Retrospective studies in the literature have shown the incidence of symptomatic splenic/portal vein thrombosis to be between 0.7% (Rattner et al., 1993) to 8% (Winslow et al., 2002). This is a single-center, prospective, randomized study in subjects undergoing laparoscopic splenectomy. All participants will receive one dose of pre-operative low molecular weight heparin (Lovenox®) subcutaneously, 2 hours prior to surgery. Participants will be randomized pre-operatively to treatment or control group however the treatment allocation will not be revealed until the surgery is complete. Postoperatively, those assigned to the treatment group will receive 40 mg of Lovenox® subcutaneously once a day for 21 days; those in the control group will not. Patients with severe renal impairment will receive an adjusted dose of Lovenox® (30 mg subcutaneous dose daily). All patients will have a baseline abdominal Doppler ultrasound preoperatively and a second one done at 14 to 28 days post surgery to monitor for the presence of portal vein and/or splenic vein thrombosis. They will also have their lipase and liver function tests checked to correlate with the imaging findings.

Nephroblastoma (Wilms tumor) is the most common kidney tumor in children. It is a malignant embryonic tumor with a good prognosis with more than 85% long-term survival with appropriate chemotherapy, surgery (which most often consists of a total nephrectomy) and radiotherapy for locally invasive forms. Some nephroblastomas (approximately 10%) present with vascular extension with vena cava thrombus, a situation which may worsen the prognosis due to the complexity of the surgery. While the oncological treatment of nephroblastoma is highly formalized, to date there is no specific guideline on the surgical management of this rare clinical presentation of nephroblastomas. The aim of the study is to provide recommendations for the surgical management of nephroblastomas with vena cava thrombus in a large multicenter series.

Activated clotting time (ACT) is currently recommended to monitor high concentrations heparin anticoagulation. ACT-LR was specifically designed to measure the activity of low dose of heparin used during endovascular surgery. The correlation between ACT-LR and Anti Xa activity which is considered as the gold standard seems to be debated. Few studies in literature had shown controversial results. These studies were conducted in patients who underwent open as endovascular surgery. However, the ACT monitoring is not recommended in open surgery. In addition, heparin administration protocols are not described and specific to each centre. In this study investigators want to study the correlation between LR-ACT and anti Xa after introducing a heparin protocol during complex endovascular procedures.