Why the study?
The study aimed to determine the robustness, reproducibility, and representativeness of the landmark ARISTOTLE and ROCKET AF randomized trials through replication in an observational AF registry.
Does apixaban or rivaroxaban reduce stroke/systemic embolism, major bleeding, and all-cause mortality compared to vitamin K antagonists in real-world atrial fibrillation patients?
Does apixaban or rivaroxaban reduce stroke/systemic embolism, major bleeding, and all-cause mortality compared to vitamin K antagonists in real-world atrial fibrillation patients?
Real-world emulation of the ARISTOTLE and ROCKET AF trials in the GARFIELD-AF registry confirms the efficacy and safety of apixaban and rivaroxaban compared to VKA in patients with atrial fibrillation.
Emulation yields similar efficacy/safety; extends RCT generalizability to real-world AF but leaves practice implications open pending prospective confirmation.
AIMS: This study aimed to determine the robustness, reproducibility and representativeness of the landmark Apixaban for Reduction in Stroke and Other Thromboembolic Events in Atrial Fibrillation (AF) (ARISTOTLE) and Rivaroxaban Once Daily Oral Direct Factor Xa Inhibition Compared with Vitamin K Antagonism for Prevention of Stroke and Embolism Trial in AF (ROCKET AF) randomised trials through replication in an observational AF patient registry. METHODS AND RESULTS: Patients from the Global Anticoagulant Registry in the FIELD (GARFIELD)-AF registry treated with apixaban, rivaroxaban or vitamin K antagonist (VKA) were assessed for eligibility for the ARISTOTLE and ROCKET AF trials. HRs of apixaban and rivaroxaban versus comparator for stroke/systemic embolism, major bleeding and all-cause mortality within 2 years follow-up were calculated using propensity score overlap-weighted Cox models. Among GARFIELD-AF patients on apixaban, 2570/3615 (71%) would have been eligible for ARISTOTLE. Among patients using rivaroxaban, 2005/4914 (41%) would have been eligible for ROCKET AF. Eligibility rates were steady over time, with minor differences across medical specialties. Real-world AF patients selected according to trial criteria had lower cardiovascular burden than the original trial participants, especially compared with ROCKET AF. HRs (95% CI) for apixaban versus VKA among ARISTOTLE-eligible users were 0.57 (0.34 to 0.94) for stroke/systemic embolism, 0.76 (0.48 to 1.20) for major bleeding and 0.89 (0.70 to 1.12) for all-cause mortality. Among ROCKET AF-eligible rivaroxaban users, HRs for rivaroxaban versus VKA were 0.90 (0.57 to 1.43), 0.92 (0.59 to 1.43) and 0.86 (0.69 to 1.08), respectively. All safety and efficacy estimates were similar to those in the original trials. CONCLUSION: Real-world representativeness of the selection criteria was greater for ARISTOTLE than ROCKET AF. The pivotal randomised trials of apixaban and rivaroxaban versus warfarin can be successfully emulated in real-world AF patients by applying trial-specific selection criteria and appropriate methodology for non-randomised treatment allocation. TRIAL REGISTRATION NUMBER: NCT01090362.
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Himmelreich et al. (2025) studied this question.
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