Apixaban for Stroke Prevention in Atrial Fibrillation: Why are Event Rates Higher in Clinical Practice than in Randomized Trials?-A Systematic Review.

Thrombosis and Haemostasis
Tim A C de VriesNoel C Chan

Abstract

 Recent reports suggest an important contribution from frequent off-label use of apixaban 2.5 mg twice daily to the higher rates of thromboembolic events observed in observational studies (OSs) relative to in randomized controlled trials (RCTs), and consequently, advocate against such use in all patients.  To examine factors contributing to the higher thromboembolic event rates, we estimated the prevalence of off-label use in contemporary practice, and compared patient characteristics and rates of stroke/systemic embolism, major bleeding, and mortality by apixaban dose and by study design in a systematic review and meta-analysis.  We identified 18 OSs and 2 RCTs that included 155,228 and 11,928 patients, respectively. Patients in OSs more often received apixaban 2.5 mg twice daily (31.3% vs. 5.1%), were older (mean age 73.8 vs. 69.8 years), and had higher CHA2DS2-VASc scores (mean 3.6 vs. 2.9) versus those in RCTs. We observed a consistent pattern of higher rates of thromboembolic events, bleeding, and mortality in patients treated with 2.5 versus 5 mg twice daily apixaban in both OSs and RCTs.  The higher risk profiles of patients in OSs versus RCTs, and higher rates of both bleeding and mortality not attributable to thromboem...Continue Reading

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Citations

Sep 18, 2020·Thrombosis and Haemostasis·Arjun K Pandey, John W Eikelboom
Oct 22, 2020·Thrombosis and Haemostasis·So-Ryoung Lee, Eue-Keun Choi
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Jan 21, 2021·European Heart Journal. Cardiovascular Pharmacotherapy·So-Ryoung LeeGregory Y H Lip
Jan 21, 2021·Thrombosis and Haemostasis·Tze-Fan Chao, Tatjana S Potpara

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