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, and also a predictable andconsistent pharmacodynamic Fingolimod profile.65,66 The eliminationhalf-life of dabigatran etexilate is 12–17 h,which enables for twice-daily dosing.62 As a result of amore consistent and predictable anti-coagulanteffect there's 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 Depending on these improvements includingsuperior efficacy on the 150mg dose relative to warfarin,the predictability and consistency of its pharmacokineticand anticoagulant activity, Fingolimod dabigatranetexilate has the potential to replace a lot on the useof warfarin and other oral VKAs for stroke preventionin patients with AF. Additionally, the availabilityof two dosesallows alower dose to be utilised in vulnerable patientgroups. By way of example, in the USA, 75mg bid canbe utilised in patients with a creatinine clearance of15–30 ml/min, while in Canada, 110 mg bid might besuitable for use in patients 580 years and/or at riskof bleeding.59,60AZD0837AZD0837 is a different 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 had been randomizedto get AZD0837 150mg as soon as day-to-day,300mg qd, 450 mg qd or 200mg bid, or warfarin, NSCLC for 3–9 months. AZD0837 300mg qdprovided similar thrombogenic suppression to warfarinwith reduced 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 a minimum of one additionalrisk element for stroke.71 In this trial, 5.0 mg isthe standard apixaban dose, even so, 2.5 mg willbe utilised in patients estimated to have higher apixabanexposure. A similar randomized, double-blind,superiority trial comparing 5mg apixaban bid withaspirinfor prevention of stroke orsystemic embolism in 55600 patients with AF andat least one risk element for stroke has recently beencompleted.
72,73 Thisstudy was terminated prematurely immediately after the very first interimefficacy analysis along with the final results showedan incidence of stroke of 1.6% per year with apixaban,vs. 3.7% per year with aspirin; both treatmentswere connected with similar rates of majorbleeding.73RivaroxabanRivaroxaban, Cell Cycle inhibitor a different element Xa inhibitor, is beingtested in various indications and is presently 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 further stroke risk 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 risk reduction of 21% overwarfarinin the on-treatment analysis;even so, in the intention-to-treat analysis, rivaroxabanfailed to demonstrate superiority.Both rivaroxaban and warfarin had been associatedwith similar rates of major 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 conducted to investigatethe safety on the element Xa inhibitor edoxabanin AF patients with a CHADS2score 52. In total, 1146 patients had been randomizedto blinded edoxabanor open-label warfarinfor 3 months.
Outcomes indicate that 30 and60mg qd edoxaban had a similar safety profileto warfarin, whereas the 30 and 60mg bid groupsexperienced additional bleeding events than thosereceiving warfarin.78 A phase III, Cell Cycle inhibitor randomized,double-blind trialis now presently assessingthe safety and efficacy of 30 and 60mg qd edoxabancompared with warfarin in patients with AF anda moderate risk of stroke.79BetrixabanAnother element 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 immediately 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 inside a doseandconcentration-dependent manner and wasw
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