Active clinical trials for "Venous Thrombosis"

Chronic Obstructive Pulmonary Disease (COPD) is a common respiratory system disease characterized by persistent respiratory symptoms and irreversible airflow restriction, which seriously endangers people's health. Acute exacerbation of chronic obstructive pulmonary disease (AECOPD) refers to individuals who experience continuous deterioration beyond their daily condition and need to change their routine medication. AECOPD is usually caused by viruses and bacteria, and patients require hospitalization, which brings a huge economic burden to society. AECOPD patients often have limited activities. Because long-term chronic hypoxia causes venous blood stasis, siltation causes secondary red blood cell increase, and blood hypercoagulability, AECOPD patients have a high risk of pulmonary embolism (PE). Pulmonary Thrombo Embolism (PTE) refers to a disease caused by blockage of the pulmonary artery or its branches caused by a thrombus from the venous system or right heart. AECOPD patients experience elevated hemoglobin levels and increased blood viscosity due to long-term hypoxia. At the same time, such patients have decreased activity, venous congestion, and are prone to thrombosis. After the thrombus falls off, it can travel up the vein, causing PTE to occur in the right heart PTE is often secondary to low deep vein thrombosis (DVT). About 70% of patients were diagnosed as deep vein thrombosis in lower limb color ultrasound examination. SteinPD conducted a survey on COPD patients and general patients from multiple hospitals. The results showed that by comparing adult COPD patients with non COPD patients, the relative risk of DVT was 1.30, providing evidence for AECOPD being more likely to combine with PTE AECOPD patients with PTE have similarities in their clinical manifestations. It is difficult to distinguish between the two based solely on symptoms, such as cough, increased sputum production, increased shortness of breath, and difficulty breathing. They lack specificity and are difficult to distinguish between the two based solely on symptoms, which can easily lead to missed diagnosis. CT pulmonary angiography (CTPA) is the gold standard for the diagnosis of PTE, but due to the high cost of testing and high equipment prices, its popularity in grassroots hospitals is not high. Therefore, analyzing the risk factors of AECOPD patients complicated with PTE is of great significance for early identification of PTE. At present, although there are reports on the risk factors for concurrent PTE in AECOPD patients, there is no specific predictive model for predicting PTE in AECOPD patients. In clinical practice, risk assessment tools such as the Caprini risk assessment model and the modified Geneva scale are commonly used for VTE, while the Wells score is the PTE diagnostic likelihood score. The evaluation indicators of these tools are mostly clinical symptoms, and laboratory indicators are less involved, It is difficult to comprehensively reflect the patient's condition, so the specificity of AECOPD patients with PTE is not strong. The column chart model established in this study presents a visual prediction model, which is convenient for clinical use and has positive help for the early detection of AECOPD patients with PTE. In addition, medical staff can present the calculation results of the column chart model to patients, making it easier for patients to understand. It helps improve the early identification and treatment of AECOPD combined with PTE patients, thereby improving prognosis.

Portal vein thrombosis is defined as partial or complete occlusion of the portal vein lumen by the blood clot or its replacement by multiple collateral vessels with the hepato-petal flow, known as 'portal cavernoma'. [1,2] Based on the published literature, 15-25% of patients with cirrhosis have portal vein thrombosis (PVT) [3], and 35-50% of patients with hepatocellular carcinoma (HCC) have malignant PVT [4] compared to 1-3.8 per 100,000 patients in the general population. [5] The reported cumulative incidence of PVT in patients of Child-Pugh A and B is 4.6% and 10.7% at 1 and 5 years respectively with higher incidence among those with decompensated disease or with an underlying hypercoagulable disorder. [6]. Similarly, the prevalence of PVT in compensated cirrhosis is around 1% which increases to 8 - 25% in liver transplant (LT) candidates and 40% in patients with hepatocellular carcinoma (HCC) [7,8]. Based on the published literature 7-9 % of all chronic liver disease patients have hepatic vein outflow tract obstruction (HVOTO) in the Indian population. [9] HVOTO is defined as obstruction to hepatic venous outflow at any site from the right atrium inlet to the small hepatic venules. The Budd-Chiari syndrome (BCS) results from occlusion of one or more hepatic veins (HV) and/or the inferior vena cava (IVC). In the West, the most common cause is HV occlusion by thrombosis. More recent Indian studies have however shown that isolated HV and combined IVC+HV obstruction are now more common. [10] In the post COVID-19 era, there has been great interest in the prothrombotic states associated with the SARS-Cov-2 virus infection, and the adverse effects of some vaccines. [11] With the availability of better molecular tests for hypercoagulable states, use of global coagulation tests (GCT) like rotational thromboelastometry (ROTEM), thromboelastography (TEG) and Sonoclot, use of therapeutic procedures like Transjugular intrahepatic portosystemic shunt (TIPS), availability of novel oral anticoagulants (NOAC), the natural course of disease can be changed with good outcomes. [12] Standard Coagulation tests (SCTs) like PT, aPTT, and platelet count are not predictive of bleeding or coagulation risk as they exclude the cellular elements of hemostasis and are unable to assess the effect of thrombomodulin and cannot assess the stage of the coagulation pathway which is affected. Global coagulation tests provide dynamic information on the coagulation pathway that is not available from conventional tests. [13]

Whilst deep vein thrombosis (DVT) is common following traumatic brain injury (TBI), optimal timing and safety of pharmacological prophylaxis is uncertain. Paradoxically the harm associated with the occurrence of is also unclear. This study is an observational pilot that aims to define the incidence of proximal DVT in patients with moderate to severe TBI. It seeks prospectively to determine if there is an association between DVT and outcome. It also seeks to explore possible associations between the occurrence of DVT and the incidence of lung injury and/or ventilator associated pneumonia.

The study will evaluate the effectiveness of a novel, real-time risk prediction model for identifying pediatric patients at risk for developing in-hospital blood clots (or venous thromboembolism [VTE]) based on data easily extracted from the electronic medical record. The study will assess whether using the risk percentages for developing VTE derived from the model increases the number of high-risk patients screened by the pediatric hematology team, which may may lead to an overall reduction in the number of pediatric VTEs seen at Monroe Carell Jr. Children's Hospital at Vanderbilt.

Rationale: Patients with cerebral venous thrombosis (CVT) are currently treated with anticoagulants during 3-12 months after diagnosis, to prevent worsening of the CVT and recurrent thrombosis, and to promote venous recanalization. Until recently, patients were generally treated with vitamin K antagonists (VKA). Direct oral anticoagulants (DOACs) are more practical in use than VKA and carry a lower risk of intracranial hemorrhage (ICH) in other conditions. One of the burning clinical questions is whether CVT patients can be safely treated with DOACs instead of VKA. In 2019, the first randomized trial on the safety and efficacy of DOACs in CVT was published (RESPECT-CVT). This exploratory study included 120 patients and the results suggest that DOACs can be safely used to treat CVT. Following RESPECT-CVT, use of DOACs to treat CVT is expected to rise, but given the limited sample size and strict selection criteria of RESPECT-CVT, additional data regarding the efficacy and safety of DOACs in CVT are required, especially from routine clinical care. Objective: To assess the safety and efficacy of DOACs for the treatment of CVT in a real-world setting. Study design: DOAC-CVT will be an international, prospective, comparative cohort study. We aim to recruit 500 patients and anticipating a 3:2 ratio in DOAC:VKA use, we expect that in total 300 patients treated with a DOAC will be included. Study population: Patients are eligible if they are >18 years old, have a radiologically confirmed CVT, and have started oral anticoagulant treatment (DOAC or VKA) within 30 days of CVT diagnosis. Primary study endpoint: The primary endpoint is a composite of major bleeding (according to the criteria of the International Society on Thrombosis and Haemostasis) AND symptomatic recurrent venous thrombosis after 6 months of follow-up. Nature and extent of the burden and risks associated with participation: This is an observational study which poses no risk or burden to the participant. Only data that are collected as part of routine clinical care will be used.

Background: Venous thromboembolism (VTE) includes the abnormal clotting of blood in a deep vein of the upper or lower limbs (deep vein thrombosis) that may travel to and block a blood vessel in the lung (pulmonary embolism). Some people with sickle cell disease (SCD)-a red blood cell disorder-seem to be at greater risk for developing these blood clots. Researchers want to study the blood of people with SCD and VTE as well as healthy people to develop better treatments to prevent blood clots. Objective: To study blood clotting in SCD because it is the most common cause of vascular death after a heart attack or stroke. Eligibility: People ages 18-80 who have SCD (with or without a history of blood clots) or the trait for SCD, and healthy volunteers Design: Participants will be screened with medical history, physical exam, and medical records review. They will give blood samples. Participants will have phone calls either every 3 months or once a year, for 2 years. They will give updates on their health. They may give additional medical records. The phone calls may last up to 30 minutes. If participants have a VTE or pain crisis episode, they may visit the Clinical Center. These visits may last up to 4 hours. They will repeat the screening tests and give blood samples. Some participants may be invited to take part in blood studies. After 2 years, some participants will have a follow-up visit at the Clinical Center. Participation will last for about 2 years.

The treatment strategies for HCC with PVTT is still controversial, and differ substantially between the west and the east. According to western guidelines, including those of the EASL, BCLC, and AASLD, PVTT is regarded as a contra-indication to initial surgery or transarterial chemoembolization. At present, there is still no consensus on the diagnosis and treatment standards of HCC with HVTT/IVCTT. European and American guidelines for liver cancer use The Barcelona Clinic Liver Cancer (BCLC) staging as the standard and classify liver cancer with HVTT/IVCTT into the advanced stage. Molecular targeted drugs such as sorafenib and lenvatinib are recommended to the patients in this phase as first-line treatment drugs and methods. In this regard, experts in China and Southeast Asian countries still have different opinions. They believe that surgery, transarterial chemoembolization (TACE), radiotherapy, and combined treatment with multiple treatment methods can achieve more satisfactory results. HCC with VTT consists of heterogeneous populations with different disease behaviors and prognoses. As a result of recent concept evolution and advances in surgical techniques and perioperative management, emerging evidence shows that selected patients with PVTT may benefit from more aggressive treatment modalities, which are recommended for by Chinese, Japanese, South Korean, and Asia Pacific clinical practice guidelines. A national survey from Japan showed median overall survival with liver resection treatment to be 1.77 years longer than with nonresection therapies, which included TACE, radiotherapy, sorafenib, or conservative treatment (2.87 years vs 1.10 years, respectively; p<0.001). After propensity-score matching of patient baseline characteristics, median overall survival since diagnosis in the liver resection group was 0.88 years longer than in the non-resection group. In a large-scale, multicentre, propensity-score matched analysis from China, surgery was the best treatment for patients with Cheng's type I and II PVTT with Child-Pugh A and selected B liver function. Median overall survival after liver resection (745 of 1580 patients) was 15.9 months (95% CI 13.3-18.5 months) for Cheng's type I PVTT and 12.5 months (10.7-14.3 months) for Cheng's type II PVTT. Thus, aggressive surgical resection in selected patients with HCC with vascular invasion, as proposed by several tertiary health-care centers in the east, seems to be reasonable. Currently, there are no dedicated clinical trials to study the value of hepatic resection in this population. Furthermore, cumulative evidence indicates that long-term overall survival after hepatic resection alone remains unsatisfactory because of the high rate of tumor recurrence and correspondingly low rate of disease-free survival. The combination of perioperative therapies may be more efficacious to improve the prognosis in selected population. More high-level evidence of novel multimodality treatment should be generated. This trial will enroll HCC patients with PVTT CNLC Stage IIIa, who have no prior anti-cancer treatment. Given the poor prognosis and limited treatment options for these patients, this population is considered appropriate for trials of more aggressive and novel therapeutic candidates in the initial treatment setting. The benefit risk profile for hepatic resection combined with perioperative atezo/bev in this patient population is expected to be favorable.

The RESOLVE-DVT study is a randomized single-center pilot study to determine the effects of hydroxyethylrutoside (Venoruton) on aspects of deep vein thrombosis (DVT) resolution associated with post-thrombotic syndrome (PTS). Based on these results, the investigators will estimate its potential as a preventive therapy for PTS. Eligible consenting patients who develop an acute, objectively confirmed DVT will be randomized and equally allocated to two trial arms, either the treatment group (Venoruton tablet 500 mg twice daily) or the control group (usual care). The pilot trial consists of 5 study contacts over 12 weeks at which outcome assessment is performed: inclusion, 1 week, 4 weeks, 8 weeks, 12 weeks. Treatment allocation is masked for outcome assessors, but not for patients.

This study is a prospective, multicenter, real world, observational study intended to understand tmechanical thrombectomy in the treatment of acute deep venous thrombosis of lower extremities, It is estimated that 600 patients with DVT were enrolled in the group at 24 centers nationwide from May 2022 to May2024. we can obtain data on the incidence of sequelae of deep venous thrombosis after PMT, and analyze the factors that may affect the efficacy of PMT.

Epidemiological data on pulmonary embolism (PE) in China needs to be updated and reported. The China Pulmonary Thromboembolism Registry Study (CURES) is designed to provide the cross-sectional spectrum and chronological trends of PE in China, as well as to reveal the intrinsic etiology and pathogenesis of the disease. The CURES is an ongoing large prospective multicenter registry, which was originally initiated in January 2009 via enrolling suspected or confirmed PE or PE with DVT (deep venous thrombosis) patients and assessed their in-hospital outcomes from 100 medical centers in the China PE-DVT network. As of July 2011, in order to determine the PE-relevant short-term outcomes, enrolled participants were followed-up for at least three months in a longitudinal manner. Since August 2016, with the launch and development of precision medicine research scheme in China, the main principle investigators of CURES decided to collect enrolled patients' blood samples with regular follow-ups every three or six months for at least two years (for long-term outcomes). The study protocol has been approved by the China-Japan Friendship Hospital ethics committee, and all collaborating centers received approvals from their local ethics committee. All patients provided written or verbal informed consent to their participation.