Role of Factor XIa and Plasma Kallikrein in Arterial and Venous Thrombosis.

Role of Factor XIa and Plasma Kallikrein in Arterial and Venous Thrombosis. Thromb Haemost. 2020 May 06;: Authors: Visser M, Heitmeier S, Ten Cate H, Spronk HMH Abstract Cardiovascular disease, including stroke, myocardial infarction, and venous thromboembolism, is one of the leading causes of morbidity and mortality worldwide. Excessive coagulation may cause vascular occlusion in arteries and veins eventually leading to thrombotic diseases. Studies in recent years suggest that coagulation factors are involved in these pathological mechanisms. Factors XIa (FXIa), XIIa (FXIIa), and plasma kallikrein (PKa) of the contact system of coagulation appear to contribute to thrombosis while playing a limited role in hemostasis. Contact activation is initiated upon autoactivation of FXII on negatively charged surfaces. FXIIa activates plasma prekallikrein (PK) to PKa, which in turn activates FXII and initiates the kallikrein-kinin pathway. FXI is also activated by FXIIa, leading to activation of FIX and finally to thrombin formation, which in turn activates FXI in an amplification loop. Animal studies have shown that arterial and venous thrombosis can be reduced by the inhibition of FXI(a) or PKa. Furthermore, data from human studies suggest that these enzymes may be valuable targets to reduce thrombosis risk. In this review, we discuss the structure and function of FXI(a) and PK(a), their involvement in the development of venous and arterial thrombosis in animal m...
Source: Thrombosis and Haemostasis - Category: Hematology Authors: Tags: Thromb Haemost Source Type: research

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Conclusions: Factor V Leiden was not associated with increased risk of subsequent atherothrombotic events and mortality in high-risk participants with established and treated CHD. Routine assessment of factor V Leiden status is unlikely to improve atherothrombotic events risk stratification in this population. PMID: 32654539 [PubMed - as supplied by publisher]
Source: Circulation - Category: Cardiology Authors: Tags: Circulation Source Type: research
AbstractBackground and ObjectivesDual antiplatelet therapy (DAPT) after percutaneous coronary intervention (PCI) reduces the incidence of thrombotic events but increases the risk of bleeding, which is associated with a substantial and durable risk of death and could offset the benefits of a reduction in thrombotic events. P2Y12 inhibitor monotherapy after short-term DAPT could be an option to reduce the risk of bleeding. We carried out a meta-analysis comparing P2Y12 inhibitor monotherapy after short-term DAPT with standard-term DAPT in patients undergoing PCI.MethodsWe searched the PubMed and EMBASE databases through 11 A...
Source: Clinical Drug Investigation - Category: Drugs & Pharmacology Source Type: research
In conclusion, the short-term DAPT can reduce the risk of bleeding compared with standard DAPT, without increasing the risk of death or ischemia (Registered by PROSPERO, CRD42020153881). PMID: 32627616 [PubMed - as supplied by publisher]
Source: Platelets - Category: Hematology Tags: Platelets Source Type: research
CONCLUSIONS: Almost one third of OHCA patients undergoing PCI die and more than one third of the fatalities are attributable to cardiovascular causes. The burden of ischemic and bleeding complications was consistently higher and the success rates of PCI lower among OHCA as compared to non-OHCA patients. PMID: 32624462 [PubMed - as supplied by publisher]
Source: EuroIntervention - Category: Cardiovascular & Thoracic Surgery Tags: EuroIntervention Source Type: research
A variety of clinical infections including the current pandemic and a variety of physical events such as bee stings and trauma have been documented as triggers of acute cardiovascular illness such as venous thromboembolism, myocardial infarction, and stroke.1 –12 A number of factors have been proposed to explain this association between infection and acute cardiovascular disease including activation of various inflammatory molecules and platelets, endothelial dysfunction, and/or augmented sympathetic nervous activity with release of high levels of cate cholamines into the circulation.
Source: The American Journal of Medicine - Category: General Medicine Authors: Tags: Commentary Source Type: research
Venous thromboembolism (VTE), including deep vein thrombosis (DVT) and pulmonary embolism (PE), represents a major cause of mortality and morbidity, and is associated with reduced survival, substantial healthcare costs, and high recurrence rates [1]. It is the third-leading cardiovascular disorder, after myocardial infarction and stroke with approximately 10 million global cases diagnosed annually [2].
Source: Thrombosis Research - Category: Hematology Authors: Tags: Letter to the Editors-in-Chief Source Type: research
Abstract PURPOSE: Although current guidelines recommend the administration of dual antiplatelet therapy (DAPT) for up to 12 months after the implantation of a drug-eluting stent (DES), extended DAPT is frequently used in real-world practice. MATERIALS AND METHODS: From the Korean Multicenter Angioplasty Team registry, we identified a total of 1414 patients who used DAPT for>3 years after DES implantation (extended-DAPT group) and conducted a landmark analysis at 36 months after the index procedure. We evaluated the determinants for and long-term outcomes of extended DAPT and compared the occurrence of majo...
Source: Yonsei Medical Journal - Category: Universities & Medical Training Authors: Tags: Yonsei Med J Source Type: research
This study evaluated the benefit of dual therapy in reducing ischemic events in atrial fibrillation (AF) patients presenting with acute coronary syndrome (ACS) or undergoing percutaneous coronary intervention (PCI). We searched PubMed, Cochrane Library, and for randomized controlled trials (RCTs) comparing dual and triple therapies (oral anticoagulation plus aspirin and P2Y12 inhibitor) for AF patients with ACS or those undergoing PCI. The composite primary outcome included all-cause death, myocardial infarction (MI), stent thrombosis (ST), or stroke. Relative risk (RR) and the corresponding 95% confiden...
Source: Aging - Category: Biomedical Science Authors: Tags: Aging (Albany NY) Source Type: research
AbstractPurposeThe ischemic/bleeding trade-off of continuing dual antiplatelet therapy (DAPT) beyond 1  year after PCI for patients with high thrombotic risk (HTR) as endorsed by 2018 ESC/EACTS myocardial revascularization guidelines remain unknown.MethodsPatients undergoing coronary stenting between January 2013 and December 2013 from the prospective Fuwai registry were defined as HTR if they met at least 1 ESC/EACTS guideline-endorsed HTR criteria. A total of 4578 patients who were at HTR and were events free at 1  year after the index procedure were evaluated. The primary efficacy outcome was major adverse car...
Source: Cardiovascular Drugs and Therapy - Category: Cardiology Source Type: research
AbstractObjectivesTo assess whether high doses of Low Molecular Weight Heparin (LMWH) (i.e. Enoxaparin 70 IU/kg twice daily) compared to standard prophylactic dose (i.e., Enoxaparin 4000 IU once day), in hospitalized patients with COVID19 not requiring Invasive Mechanical Ventilation [IMV], are:more effective in preventing clinical worsening, defined as the occurrence of at least one of the following events, whichever comes first:DeathAcute Myocardial Infarction [AMI]Objectively confirmed, symptomatic arterial or venous thromboembolism [TE]Need of either:Continuous Positive Airway Pressure (Cpap) or Non-Invasive Ventilatio...
Source: Trials - Category: Research Source Type: clinical trials
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