Thrombosis research
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Thrombosis research · Apr 2016
Hypercoagulable state as demonstrated by thromboelastometry in hemoglobin E/beta-thalassemia patients: Association with clinical severity and splenectomy status.
Patients with hemoglobin E/beta-thalassemia disease (E/β) are at risk of thromboembolism. Rotational thromboelastometry (ROTEM®) can be used to determine a hypercoagulable state. The objective was to describe the hemostatic and thromboelastometric changes in pediatric patients with E/β with different clinical severity, in comparison with healthy children as controls. ⋯ Hypercoagulable state was demonstrated by ROTEM® in patients with E/β with severe disease and who were previously splenectomized. The hypercoagulable state was associated with the higher numbers of PLT rather than the decrease of PC, PS, and AT.
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Thrombosis research · Mar 2016
ReviewIncreased bleeding risk in patients with aortic valvular stenosis: From new mechanisms to new therapies.
Aortic stenosis (AS), the most prevalent acquired valvular disease in the adults that requires invasive treatment, coexists with coagulopathy, resulting in bleeding in approximately 20% of patients. In the current review, we summarize the available knowledge on the mechanisms underlying the bleeding tendency observed in AS, and discuss potential compensatory mechanisms preventing most patients with severe AS from experiencing bleeding. ⋯ Both surgical valve replacement and transcatheter aortic valve implantation are discussed. Finally, we discuss current treatment recommendations in AS related bleeding.
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Thrombosis research · Mar 2016
Clinical TrialDetermination of dabigatran and rivaroxaban by ultra-performance liquid chromatography-tandem mass spectrometry and coagulation assays after major orthopaedic surgery.
Major orthopaedic surgery is associated with an increased risk of venous thromboembolism. Direct oral anticoagulants (DOACs) are recommended as thromboprophylactic agents after orthopaedic surgery. Although routine monitoring of DOACs in general is not required, measuring DOAC concentration may be necessary in clinical settings. ⋯ Current coagulation assays are not suited for this purpose. We found large heterogeneity in both peak and trough concentrations of DOACs, and showed that pharmacokinetics of novel oral anticoagulants may be influenced by age and gender. Whether patients with high or low trough concentrations are at increased risk for bleeding or thromboembolic events respectively remains to be established.
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Thrombosis research · Mar 2016
Meta AnalysisPlasma anti-FXa level as a surrogate marker of the adequacy of thromboprophylaxis in critically ill patients: A systematic review.
Critical care patients are prone to venous thromboembolism (VTE) and, thus, pharmacological thromboprophylaxis is generally advised. Low-molecular weight heparins (LMWHs) have become the drug of choice in ICU patients, since their predictable and reproducible dose response. Monitoring their pharmacological effect is not usually necessary except in special occasions (i.e. with obese or renal failure patients), where anti-FXa level measuring is recommended. However, there is neither recommendation of adequate anti-FXa levels in critically ill patients nor is it known whether peak or trough level should be measured. The aim of this systematic review was to evaluate the recommended LMWH doses, and the reasons to monitor anti-FXa levels. ⋯ Based on the current literature, no definite conclusions can be drawn on targeted anti-FXa level in critically ill patients when using LMWH thromboprophylaxis.
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Thrombosis research · Mar 2016
Melatonin does not affect disseminated intravascular coagulation but diminishes decreases in platelet count during subacute endotoxaemia in rats.
Inhibitory effects of exogenous melatonin (MLT) on plasma coagulation and platelet aggregation have already been observed in vivo and in vitro under normal conditions. Here, we studied whether MLT also diminishes the lipopolysaccharide (LPS)-induced disseminated intravascular coagulation (DIC) during subacute endotoxaemia. ⋯ Melatonin does not affect DIC but diminishes thrombocytopenia and haemolysis during endotoxaemia.