linfarction was numerically higher with dabigatranetexilate than with warfarin, but this imbalancedid not reach statistical significance. Neither doseof dabigatran etexilate appeared to cause livertoxicity.62Dabigatran etexilate possesses other benefitscompared with warfarin therapy. It has a rapidonset and offset of action, plus a predictable andconsistent pharmacodynamic Fingolimod profile.65,66 The eliminationhalf-life of dabigatran etexilate is 12–17 h,which allows for twice-daily dosing.62 On account of amore consistent and predictable anti-coagulanteffect there is no requirement for routine anticoagulationmonitoring.66 Lastly, dabigatran etexilatehas a low potential for drug–drug interactions;has no food–drug interactions; and doesn't interactwith the cytochrome 450enzymesystem.
67,68 According to these improvements includingsuperior efficacy from the 150mg dose relative to warfarin,the predictability and consistency of its pharmacokineticand anticoagulant activity, Fingolimod dabigatranetexilate has the potential to replace a lot from the useof warfarin along with other oral VKAs for stroke preventionin patients with AF. Furthermore, the availabilityof two dosesallows alower dose to be applied in vulnerable patientgroups. For example, in the USA, 75mg bid canbe applied in patients having a creatinine clearance of15–30 ml/min, when in Canada, 110 mg bid may possibly besuitable for use in patients 580 years and/or at riskof bleeding.59,60AZD0837AZD0837 is one more pro-drug, which is converted toa selective and reversible DTI. The safety of anextended-release Cell Cycle inhibitor formulation has been assessed ina phase II, randomized, controlled trial.
69 Nine hundredand fifty-five patients with AF were randomizedto receive AZD0837 150mg when daily,300mg qd, 450 mg qd or 200mg bid, or warfarin, NSCLC for 3–9 months. AZD0837 300mg qdprovided comparable thrombogenic suppression to warfarinwith lower bleeding ratesin theApixaban for the Prevention of Stroke in SubjectsWith Atrial Fibrillationtrial, an international,double-blind, randomized, non-inferioritytrial of 18 206 AF patients with at the very least a single additionalrisk aspect for stroke.71 In this trial, 5.0 mg isthe common apixaban dose, however, 2.5 mg willbe applied in patients estimated to have higher apixabanexposure. A comparable randomized, double-blind,superiority trial comparing 5mg apixaban bid withaspirinfor prevention of stroke orsystemic embolism in 55600 patients with AF andat least a single danger aspect for stroke has recently beencompleted.
72,73 Thisstudy was terminated prematurely right after the very first interimefficacy analysis as well as the results showedan incidence of stroke of 1.6% per year with apixaban,vs. 3.7% per year with aspirin; both treatmentswere associated with comparable rates of majorbleeding.73RivaroxabanRivaroxaban, Cell Cycle inhibitor one more aspect Xa inhibitor, is beingtested in various indications and is currently licensedfor thromboprophylaxis following elective total hipand knee replacement.74 A Phase III, randomized,double-blind, non-inferiority studyinvestigating the efficacy of 20mg qd rivaroxabanversus warfarin to prevent stroke in nonvalvularAF patients with prior stroke/TIA or atleast two extra stroke danger factors75, has recentlycompleted.
In this Fingolimod trial, which integrated over14 000 patients, rivaroxaban was non-inferiorto dose-adjusted warfarin for the primaryendpoint; a composite of stroke and non-central nervoussystem embolism. For this endpoint, rivaroxabanprovided a relative danger reduction of 21% overwarfarinin the on-treatment analysis;however, in the intention-to-treat analysis, rivaroxabanfailed to demonstrate superiority.Both rivaroxaban and warfarin were associatedwith comparable rates of significant and non-major bleeding. The incidence of ICH was significantlylower in subjects taking rivaroxaban than in individualsreceiving warfarin.76,77EdoxabanA multicentre, Phase II study was performed to investigatethe safety from the aspect Xa inhibitor edoxabanin AF patients having a CHADS2score 52. In total, 1146 patients were randomizedto blinded edoxabanor open-label warfarinfor 3 months.
Results indicate that 30 and60mg qd edoxaban had a comparable safety profileto warfarin, whereas the 30 and 60mg bid groupsexperienced much more bleeding events than thosereceiving warfarin.78 A phase III, Cell Cycle inhibitor randomized,double-blind trialis now currently assessingthe safety and efficacy of 30 and 60mg qd edoxabancompared with warfarin in patients with AF anda moderate danger of stroke.79BetrixabanAnother aspect Xa inhibitor, betrixaban, was selectedfrom a promising range of investigational compoundsin early development.80 The anticoagulanteffects of betrixaban in humans was initially investigatedin the US and Canadian trial, in which itwas compared with enoxaparin for prevention ofthromboembolism right after knee replacement surgery.81 In this study, 215 patients wererandomized to treatment with betrixaban 15mg or40mg bid, or enoxaparin 30 mg subcutaneouslyevery 12 h for 10–14 days. Betrixaban inhibitedthrombin generation and anti-Xa levels in a doseandconcentration-dependent manner and wasw
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