non-major bleeding between your two treatmentgroups.GDC-0068 In summary, apixaban exhibited brilliance comparedwith the EU dose of enoxaparinbut didn't show non-inferiority compared withthe North American dose of enoxaparinfor the prevention of VTE following whole kneereplacement surgery.GDC-0068 In terms of the likelihood ofmajor bleeding, apixaban exhibited prices that werecomparable with both enoxaparin dosing regimens.Treatment choiceOf the new oral anticoagulants, dabigatran etexilate andrivaroxaban have been authorized for use in patientsfollowing hip and knee replacement surgery in manycountries.Lapatinib No direct head-to-head comparisons of thesetwo agents have been made. Nevertheless, a meta-analysis ofthe pivotal studies comparing dabigatran etexilate withenoxaparinor rivaroxaban with enoxaparinfor VTE prevention after total hip and total kneereplacement surgery was undertaken using standardizedbleeding definitions for key, plus clinically related nonmajor,bleeding. This post hoc analysis demonstratedthat dabigatran etexilate showed similar rates of efficacyand bleeding compared with enoxaparin, while rivaroxaban was more effective thanenoxaparin but had a somewhat higher risk of bleeding.PARP ConclusionsThree new oral anticoagulant agents have been evaluated inphase III clinical trials for VTE prevention in optional hipand knee replacement surgery compared with the LMWHenoxaparin administered subcutaneously, and the resultshave been published. Dabigatran etexilate, a direct thrombininhibitor, at doses of 220 or 150 mg once daily, hasbeen proved to be as effective and safe since the EU dose ofenoxaparinand less effective, butequally safe, because the North American dose regime ofenoxaparin. The factor Xa inhibitorrivaroxabanwas more effective thanboth the EU and North American doses of enoxaparinwhilst maintaining comparable rates of major bleeding.Lapatinib However, in a meta-analysis of the critical studies comparingrivaroxaban with enoxaparin using standard bleedingdefinitions for major, plus clinically relevant non-major,bleeding, rivaroxaban was associated with significantlyhigher rates of major bleeding plus clinically relevantnon-major bleeding than enoxaparin. Apixaban, also an issue Xa inhibitor, demonstratedsuperior effectiveness and equivalent security compared withthe EU dose of enoxaparin but was not as effective as theNorth American dose of enoxaparin. Dabigatran etexilateand rivaroxaban are currently the only new oral anticoagulantagents that are available for thromboprophylaxisfollowing elective hip and knee replacement surgery. Asthere has been no head-to-head trial of these two agents,direct comparative data upon which to base clinicaldecisions are lacking. Nevertheless, the option of which oralanticoagulant agent to use in these surgical patients must bebased on an assessment of each individual patient's riskfactors for both VTE and bleeding, so that the chosentreatment ensures a balance between effectiveness and safety.DTIs are agents that neutralize thrombin directly by bindingto its active catalytic site and blocking its relationships withits substrates. Thrombin plays a central role in the clottingprocess. As a point of convergence of the two pathways of thecoagulation cascade, thrombin converts soluble fibrinogen tofibrin and activates factors V, VIII, and XI which generatemore thrombin. In addition it encourages platelets and stabilizes theclot by activating factor XIII which favors the formationof cross- linked bonds one of the fibrin molecules.DTIs include the parenteral drugs argatroban, bivalirudin,hirudin, and the only real dental DTI available dabigatran etexilate,which has been developed most recently.1.1. Dabigatran Etexilate. Dabigatran etexilateis anorally administrated, specific, and effective reversible thrombininhibitor. It is a prodrug that is rapidly converted intoits active metabolite dabigatran by a device independentof the CYP enzymes and other oxidoreductases. DEreaches maximal plasma concentrations within two hours ofadministrationor within four hours if it is given withfood. This variability has no final effect in the action ofthe drug. Dabigatran etexilate exhibits linear pharmacokineticcharacteristics as noted in a previous studyin healthy volunteers and has a percentage of binding toplasma proteins of about 35%. Dabigatran clearance ispredominantly renal, with 80% excreted unchanged in theurine and for this reason needs a dose adjustment whenadministered to subjects with a creatinine clearance
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