Discontinuation of oral anticoagulants may expose non-valvular atrial fibrillation (NVAF) patients to an increased risk of stroke. This study describes the real-world discontinuation rates and compared the risk of drug discontinuation among NVAF patients initiating apixaban, warfarin, dabigatran, or rivaroxaban. This retrospective cohort study evaluated newly-anticoagulated NVAF patients in the MarketScan® data population from 01/01/2012 through 12/31/2014. Discontinuation was defined as a lack of subsequent prescription of the index drug within 30 days after the last supply day of the last prescription. A Cox model was used to estimate the hazard ratio (HR) of discontinuation, adjusted for age, sex, and comorbidities. Among 45,361 eligible NVAF patients, 15,461 (34.1%) initiated warfarin; 7,438 (16.4%) apixaban; 4,661 (10.3%) dabigatran; and 17,801 (39.2%) initiated rivaroxaban treatment. Compared to warfarin, patients who initiated dabigatran (adjusted HR [aHR]: 0.84, 95% confidence interval [CI]: 0.80-0.87, P<0.001), rivaroxaban (aHR: 0.70, 95% CI: 0.68-0.73, P<0.001), or apixaban (aHR: 0.57, 95% CI: 0.55-0.60, P<0.001) were 16%, 30%, and 43% less likely to discontinue treatment, respectively. When compared to apixaban, patients who initiated dabigatran (aHR: 1.46, 95% CI: 1.38-1.54, P<0.001) or rivaroxaban (aHR: 1.23, 95% CI: 1.17-1.28, P<0.001) were more likely to discontinue treatment. Among newly-anticoagulated NVAF patients in the real-world setting, initiation on rivaroxaban, dabigatran, or apixaban was associated with a significantly lower risk of discontinuation compared to warfarin. When compared to apixaban, patients who initiated treatment with warfarin, dabigatran, or rivaroxaban were more likely to discontinue treatment.
Introduction: The CHA 2 DS 2 -VASc score is an established tool to determine the risk of stroke among atrial fibrillation (AF) patients. The goal of this retrospective claims analysis is to evaluate the incidence of stroke/systemic embolism (SE) and major bleeding (MB) events among patients with non-valvular AF (NVAF) who initiated an oral anticoagulant (OAC; apixaban, dabigatran, edoxaban, rivaroxaban, or warfarin) relative to their CHA 2 DS 2 -VASc score. Methods: Adult NVAF patients who initiated OACs were identified from 01JAN2013-31MAR2019 using data from five insurance claims databases. Patients were required to have 12 months continuous enrollment prior to index (OAC claim date) and were followed to the earliest of OAC discontinuation, death, disenrollment, or study end. Results were stratified by CHA 2 DS 2 -VASc score on index: low (0 for males and 1 for females), moderate (1 for males and 2 for females), high risk 1 (2-3 for males and 3 for females) and high risk 2 (≥4 for males and females). The incidence rate and cumulative incidence were reported for stroke/SE and MB, defined by hospitalization with a primary diagnosis of the respective outcomes. Results: A total of 1,141,097 NVAF patients were identified including 29,298 low risk, 95,584 moderate risk, 327,766 high risk 1 and 688,449 high risk 2 patients. The median follow-up time for all patients was 160 days. The incidence of stroke/SE and MB was 1.3 and 4.1 per 100 person years, respectively. Cumulative incidence for stoke/SE and MB increased across risk groups (Figure). Significant differences were seen for both stroke/SE and MB, when comparing the high risk 1 or high risk 2 group to the low-risk reference group. Conclusions: Assessing stroke/SE and MB events by CHA 2 DS 2 -VASc risk category demonstrates the differences in the rate of events according to the risk groups and provides insight for anticoagulated NVAF patients with clinical risk factors.
We estimate that from 2010 to 2060, the number of adults 55 years and over with AF in the European Union will more than double. As AF is associated with significant morbidities and mortality, this increasing number of individuals with AF may have major public health implications.
The FIRE trial compared culprit-only revascularization to physiology-guided complete revascularization strategy in elderly patients presenting with myocardial infarction. The study has shown that it is a safe approach and may confer additional prognostic benefit in patients with NSTEMI.