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Inhibition of Platelet Aggregation After Coronary Stenting in Patients Receiving Oral Anticoagulation Pulmonary Artery Denervation Attenuates Pulmonary Arterial Remodeling in Dogs With Pulmonary Arterial Hypertension Induced by Dehydrogenized Monocrotaline Anthracycline Therapy Is Associated With Cardiomyocyte Atrophy and Preclinical Manifestations of Heart Disease Frailty in Older Adults Undergoing Aortic Valve Replacement: The FRAILTY-AVR Study Comparison of 1-month Versus 12-month Dual Antiplatelet Therapy after Implantation of Drug-eluting Stents Guided by either Intravascular Ultrasound or Angiography in Patients with Acute Coronary Syndrome: Rationale and Design of Prospective, Multicenter, Randomized, Controlled IVUS-ACS & ULTIMATE-DAPT trial Impact of SYNTAX Score on 10-Year Outcomes After Revascularization for Left Main Coronary Artery Disease Long-Term Outcomes of Different Two-Stent Techniques With Second-Generation Drug-Eluting Stents for Unprotected Left Main Bifurcation Disease: Insights From the FAILS-2 Study Relationship Between Coronary Artery Calcium and Atherosclerosis Progression Among Patients With Suspected Coronary Artery Disease Bayesian Interpretation of the EXCEL Trial and Other Randomized Clinical Trials of Left Main Coronary Artery Revascularization Left Main Percutaneous Coronary Intervention Versus Coronary Artery Bypass Grafting in Patients With Prior Cerebrovascular Disease: Results From the EXCEL Trial

Clinical TrialVolume 72, Issue 1, July 2018

JOURNAL:J Am Coll Cardiol. Article Link

Risk of Myocardial Infarction in Anticoagulated Patients With Atrial Fibrillation

C J-Y Lee, TA Gerds, N Carlson et al. Keywords: apixaban; dabigatran; direct oral anticoagulant; rivaroxaban; vitamin K antagonist

Abstract


BACKGROUND - Evidence is conflicting as to the efficacy of direct oral anticoagulation (DOAC) and vitamin K antagonist (VKA) for prevention of myocardial infarction (MI).

OBJECTIVES - This study aimed to investigate the risk of MI associated with the use of apixaban, dabigatran, rivaroxaban, and VKA in patients with atrial fibrillation.

METHODS - Patients with atrial fibrillation were identified using Danish health care registers and stratified by initial oral anticoagulant treatment. Standardized absolute 1-year risks were estimated based on Cox regression for hazard rates of MI hospitalizations and mortality. Reported were absolute risks separately for the oral anticoagulation treatments and standardized to the characteristics of the study population.

RESULTS - Of the 31,739 patients included (median age, 74 years; 47% females), the standardized 1-year risk of MI for VKA was 1.6% (95% confidence interval [CI]: 1.3 to 1.8), apixaban was 1.2% (95% CI: 0.9 to 1.4), dabigatran was 1.2% (95% CI: 1.0 to 1.5), and rivaroxaban was 1.1% (95% CI: 0.8 to 1.3). No significant risk differences were observed in the standardized 1-year risks of MI among the DOACs: dabigatran versus apixaban (0.04%; 95% CI: −0.3 to 0.4), rivaroxaban versus apixaban (0.1%; 95% CI: −0.4 to 0.3), and rivaroxaban versus dabigatran (−0.1%; 95% CI: −0.5 to 0.2). The risk differences for DOACs versus VKA were all significant: −0.4% (95% CI: −0.7 to −0.1) for apixaban, −0.4% (95% CI: −0.7 to −0.03) for dabigatran, and −0.5% (95% CI: −0.8 to −0.2) for rivaroxaban.

CONCLUSIONS - No significant risk differences of MI were found in the direct comparisons of DOACs, and DOACs were all associated with a significant risk reduction of MI compared with VKA.