Jawed Fareed

..The sensitivity of ECT was adjusted by varying the concentration of the ecarin reagent. The results suggest that HCII-mediated inhibition of thrombin can be detected by using ECT reagents...

..Some objective guidelines for the proper development of these drugs are needed. Only expert groups and advisory panels to the regulatory bodies can develop these guidelines...

..When these data are not available, the dosing and administration of low molecular weight heparins must be adapted from existing data and recommendations...

..Prasugrel has proven to be efficacious but is associated with a higher bleeding risk in comparison to clopidogrel and therefore has to be used in appropriate clinical indications...

..Based on the available literature, it can be concluded that each product exhibits individuality...

..Heparins, warfarin and aspirin will continue to play a major role in the management of thrombotic and cardiovascular disorders for years to come...

..Heparins, warfarin, and aspirin will continue to play a major role in the management of thrombotic and cardiovascular disorders beyond 2010...

..Thus, until the establishment of valid regulatory guidelines for the generic interchangeability of the commercially available LMWHs is completed, generic substitutes are not recommended...

..In addition, the observed hemodynamic changes in some of the cancer patients may be due to increased NO production...

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..The pharmacological profile of argatroban is unique as this antithrombin drug not only inhibits thrombogenesis but also modulates cellular functions. Because of its broad spectral actions, argatroban will have more expanded indications...

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..There are important pharmacokinetic and pharmacodynamic differences between enoxaparin, other LMWHs and UFH, and therefore these molecules cannot be regarded as interchangeable...

..Recent developments as well as future trends in the area of thrombin inhibitors and anti-Xa agents are reviewed...

..9% (9 of 114) had antibovine antibodies and 3.5% (4 of 114) had human antithrombin antibodies, suggesting that antibodies may arise from contact with antigenic sources other than bovine-derived thrombin...

..abstract:..

..These agents may not have the broad clinical spectrum as that observed with the heparins. More recently, several pharmaceutical companies have produced generic LMWHs...

..In this review, the pharmacology of warfarin and the pharmacology of the newly developed oral anti-Xa and antithrombin agents are discussed...

..These results warrant further investigation of sulodexide in additional preclinical and clinical studies...

..The OSCSs significantly increased anti-Xa activity in ex vivo blood samples. These results indicate that various sources of OSCS affect the hemostatic properties of heparin...

..Semuloparin and bemiparin are two depolymerized heparins produced by distinct manufacturing processes. The objective of this investigation was to determine whether a common standard could be used to define their potency...

..These observations suggest that the OSCS contaminant in the recalled heparin triggers an immunogenic response not seen with OSCS-contaminated free heparin...

..Our findings indicated that TFPI release is dependent on the molecular weight of heparin and its derivatives. Heparin oligosaccharides exert their vascular effects through increased TFPI release after long-term repeated administration...

..In conclusion, MPS showed a stronger release of TFPI than heparin that was not associated with a strong anticoagulant effect. Moreover, MPS downregulated TAFI, resulting in an enhanced fibrinolytic effect...

..DX-9065a did not affect the ecarin clotting time and thrombin time at concentrations up to 12.5 microgram/mL. Because DX-9065a prolonged the dRVVT, this may impact diagnostic screening of patients with systemic lupus erythematosus...

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..These data also warrant the development clinically relevant methods for the monitoring of the concomitant use of newly developed anti-Xa and anti-IIa drugs with oral anticoagulants...

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..These differences could be attributed to the endogenous release of tissue factor pathway inhibitor (TFPI) by C3 at higher doses, which is associated with the vascular effects of C3...

..These data provide the rationale for a novel mechanism of thrombosis through increased activity of CRP, nitric oxide, and TAFI, leading to fibrinolytic deficit and thrombosis in patients treated with erythropoietin...

..Until such guidelines are complete, generic interchange may not be feasible...

..These results suggest that despite the presence of a trace amount of bovine factor Va antigen in bovine thrombin preparations, these contaminants failed to elicit the generation of antibodies against factor Va light chain in rabbit...

..TAT may be a useful test in monitoring the resolution of the clots. However, additional clinical validation is required to demonstrate the relevance of these parameters with the clinical outcome...

..The contaminant isolated from contaminated heparin was oversulfated chondroitin sulfate (OSCS). Other possible contaminants should be evaluated...

..These studies warrant further in vivo investigation to validate the relative neutralization profile of sulfaminoheparosans...

..Clinical significance of the differential generation of HIT-associated antibodies remains unexplored at this time...

..When comparing low-molecular-weight heparin (LMWH) with UFH, the incidence of new antiheparin-PF4 antibody production is higher in patients treated with UFH...

..Anti-JMI Abs did not cross-react with Recothrom, and Evithrom. Also, anti-Evithrom did not show any cross-reactivity with Recothrom and JMI at any time...

..These results suggest that PMX 60056 may provide an improved approach for the neutralization of UFH and LMWHs...

..Heparin and related oligosaccharides are known to exhibit anti-inflammatory effects as well as inhibitory effects on proteoglycan assembly and may prove useful as neuroprotective agents...

..Thus the therapeutic effects of bioheparins in the TF-mediated pathogenesis of platelet activation may be similar to those of heparins...

..Thus, the patients who were previously exposed to bovine thrombin may also develop antibodies which can cross-react with human recombinant thrombin...

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..9%) on day 7. C-reactive protein (CRP), tumor necrosis factor alpha (TNF-alpha), and serum amyloid A were also increased after surgery. Tissue factor pathway inhibitor (TFPI) antigen levels were increased due to the treatment modalities...

..25 microg/ml. These data indicate that phylogenetic similarities in platelets of humans and primates may be used to further characterize the pathophysiology of HIT syndrome...

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..Thus, the inhibition of Factor Xa and its generation is an important strategy in the development of new antithrombotic drugs...

..Our study shows that ESRD patients exhibit activation of the coagulation and inflammatory processes...

..Markers of inflammation were also decreased in the 2 groups...

..The ECT system was found to be less sensitive when compared to other tests, and therefore, could be used as a point-of-care test during the PTCA/stenting procedures to monitor argatroban...

..This study further validates the role of endothelial damage and endogenous thrombotic processes in ESRD as evidenced by the increased levels of TM and DD...

..In conclusion, we found that HS did show immune-modulator properties in both normal and TB environments. Our studies reinforced the possibility that HS could one day be used as an immune-modulating therapeutic agent...

..The US FDA considers these drugs as follow-on agents whereas the EMEA classifies these drugs as biosimilar agents. Until clear guidelines are developed, generic interchange of LMWHs may not be feasible...

..240 μg/kg). In summary, the AT level is a rate-limiting factor for the antithrombotic activity of fondaparinux...

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..It is conceivable that some of the newer drugs in combined modalities may mimic the broad therapeutic spectrum of heparins and warfarin. However, clinical validation is required for the therapeutic interchange for specific indications...

..Ultra-LMWHs and synthetic heparinomimetics, such as fondaparinux, that exhibit a narrow pharmacologic spectrum will only be useful in specific indications and in combination with other drugs...

..These findings were verified by intravenous administration of tritium-labeled C3 followed by detection of the radioactivity in the CSF and brain homogenates. These data suggest that ultralow MW HDO may pass through the BBB...

..In vivo behavior is an important consideration for defining pharmacoequivalence of complex biologic drugs...

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..In the anti-Xa assay, modification of the incubation time was employed to extend the proper sensitivity range. These studies warrant further investigation to understand the mechanism of action of factor Xa inhibitors...

..There was no significant difference between the reference intervals of subsets and the whole group (p > 0.05) calculated by both statistical techniques. Very few outliers were observed among these subjects in both tests...

..In addition, the low anticoagulant effect of C3 suggests that this compound could be a relatively low-risk adjunct in the treatment of AD...

..Together, these data indicate that IgG is the principal mediator of platelet activation in patients with HIT, with IgA and IgM playing a less significant role in the pathophysiology of this syndrome...

..This article describes the laboratory diagnosis of APLS, including the detection of lupus anticoagulants, anticardiolipin antibodies, and subtypes of antiphospholipid antibodies...

..Since then, this drug has been studied extensively to prove its clinical efficacy and safety...

..On review of the preclinical and clinical data on the safety and efficacy, the European Union and U.S. Food and Drug Administration (US-FDA) have recently approved the use of rhAT in specified clinical indications...

..These studies suggest that the class B cats exhibited sufficiently wide variations in their coagulation parameters that they may not be optimal subjects for vascular or cardiovascular research...

..For a proper pharmacodynamic analysis, multiple assays should be considered, given that both UFH and LMWHs are polycomponent in nature...

..Some of these tests may prove to be useful in clinical diagnosis and management of acute coronary syndromes. Clinical outcome studies are needed to determine which tests may be cost effective and medically useful...

..Both drugs are being developed as antithrombotics for venous and arterial thrombosis, acute coronary syndrome, stroke and as adjuncts to thrombolytic therapy...

..At present, laboratory monitoring is not recommended. Clinical trials for treatment of established thrombosis, coronary syndromes and adjunct to thrombolytic therapy are in progress...

..The advent of cyclooxygenase-2 inhibitors has been both a blessing and a curse for pain management. An in-depth understanding of the biological molecules in the arachidonic acid metabolism may alleviate pain without risk...

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..05). It is proposed that the ability of the topically administered MPS to increase the free and total TFPI levels may be one of the modes of action that contributes to the anticoagulant and anti-inflammatory actions of this agent...

..We report a prospective, historical- controlled study evaluating the efficacy and safety of argatroban, a direct thrombin inhibitor, as anticoagulant therapy in patients with HIT or HIT with thrombosis syndrome (HITTS)...

..As a result, oversulfated chondroitin sulfate was found to be the main determinant of the observed adverse reactions. This glycosaminoglycan is not usually found in the mammalian tissues...

..These results suggest that SH is a strong anticoagulant with comparable properties to mammalian heparins and can be used in the development of clinically useful antithrombotic-anticoagulant drugs...

..The influence of molecular weight, charge density, and interactions with heparin cofactor II on TFPI release are also discussed...

..The calculated circulating concentrations of Refludan, following a bolus administration, based on the ECT cards, liquid ECT and APTT were 3.20 +/- 1.3, 3.51 +/- 1.35 and 2.02 +/- 1.19 microg/mL, respectively...

..The purpose of this study was to identify unique proteomic biomarkers present in patients with ACS using a newly developed proteomic profiling technique, surface enhanced laser desorption/ionization (SELDI)...

..Low molecular weight heparins (LMWHs) have different antithrombin/anti-Xa profiles and therefore vary in the degree to which they inhibit TAFI. The purpose of this study was to determine the differential regulation of TAFI by LMWHs...

..These results suggest that burn, septic, and their combined injuries perturb coagulation cascade and thrombotic process toward the procoagulant pathway by impairing fibrinolysis...

..A strong correlation between Hemochron ACT and FPA generation inhibition was observed. Based on this significant correlation, the FPA generation inhibition can be predicted by point-of-care ACT assay...

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..Besides, ultraviolet detection is not needed for molecular weight calculations. Therefore, it is proposed that its feasibility as a universal reference calibrator for both heparins and low molecular weight heparins be considered...

..Because of the molecular characteristics and the dual nature of the pharmacologic action of PI-88, this agent represents an attractive pharmacologic agent for the control of thrombotic and proliferative disorders...

..TAFI levels were very low and essentially undetectable in the plasma of patients with advanced hepatocellular liver disease. No relationship with the degradation products of fibrin was evident...

..A new synthetic version of (pentasaccharide) both heparin and LMWH has been at least if not more effective than one LMWH (enoxaparin)...

..The effect of repeated administration of LMWH mimicking the postsurgical prophylaxis of DVT exhibited product-based augmentation of the antithrombotic or hemorrhagic effects...

..CONCLUSIONS: Liver dialysis device activates both coagulant and fibrinolytic pathways, activates inflammatory response, but these responses are limited to the vascular compartment by an increase in sL-selectin levels...

..This suggests that the simultaneous administration of GPIIb/IIIa receptor antagonist with LMWH may not have any added benefit in the clinical management of patients with ACS...

..These studies demonstrate that SR 121566A is an effective platelet inhibitor with predictable pharmacokinetic and pharmacodynamic characteristics...

..3 +/- 0.05 g) vs. untreated (0.14 +/- 0.02 g) groups. These results show a potential role of HS as an immune modulating agent with antitumor properties...