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Has AF or flutter (paroxysmal or persistent), not felt to be secondary to a reversible cause, and an indication for indefinite anticoagulation treatment as described in the protocol\n2. Meets one of the following:\n\n   1. CHA2DS2-VA \\[C: Congestive heart failure; H: Hypertension; A2: Age ≥75 years (double points); D: Diabetes mellitus; S2: Stroke or TIA or Thromboembolism (double points); V: Vascular disease; A: Age 65-74 years\\] score ≥2 and Oral Anticoagulant (OAC) naïve or\n   2. CHA2DS2-VA score ≥3 or\n   3. CHA2DS2-VA score of 2 and at least 1 enrichment criteria as described in the protocol\n3. Must have an International Normalization Ratio (INR) \\\u003C2.5 at the time of randomization if taking warfarin or another Vitamin K Antagonist (VKA)\n\nKey Exclusion Criteria:\n\n1. Has a mechanical heart valve prosthesis (Note: transcatheter aortic valve replacement is not an exclusion)\n2. Has known moderate-to-severe mitral stenosis\n3. Has had successful ablation therapy or Left Atrial Appendage (LAA) occlusion\u002Fexclusion, or planned ablation or LAA occlusion\u002Fexclusion as described in the protocol\n4. Had an ischemic stroke within 2 days prior to randomization\n5. Has estimated Glomerular Filtration Rate (eGFR) \\\u003C15 mL\u002Fmin\u002F1.73m\\^2 within 30 days prior to randomization or on dialysis or expected to be started as described in the protocol\n6. Has a history of central nervous system bleeding within 30 days prior to randomization\n\nNote: Other protocol-defined Inclusion\u002F Exclusion criteria apply","ALL","18 Years",{"count":511,"type":512},1200,"ESTIMATED","INTERVENTIONAL",[515],"PHASE2","This study is researching experimental drugs called REGN7508 and REGN9933. The study is focused on participants who have atrial fibrillation, which means that the heart beats too fast and unevenly. 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The bleeding effects of REGN7508 and REGN9933 will be compared to another medicine (apixaban), which is available on the market to treat and prevent formation of blood clots.\n\nThe study is looking at several other research questions, including:\n\n* What side effects may happen from taking REGN7508 or REGN9933\n* How well do the study drugs reduce the risk of having a stroke\n* How much of REGN7508 or REGN9933 is in the blood at different times\n* Whether the body makes antibodies against REGN7508 or REGN9933 (which could make the drugs less effective or could lead to side effects)",[518],"Atrial Fibrillation (AF)",[520,521,522,523],"Bleeding","Stroke","Systemic embolism","Blood clots","2026-06-16",{"date":526,"type":527},"2026-06-17","ACTUAL",{"date":529,"type":527},"2025-10-20",{"date":531,"type":512},"2027-04-21",{"name":5,"class":6},48]