Antonios Douros1,2,3, Christel Renoux1,2, Janie Coulombe1,2, Samy Suissa1,2. 1. Centre for Clinical Epidemiology, Lady Davis Institute-Jewish General Hospital, Montreal, QC, Canada. 2. Department of Epidemiology and Biostatistics, McGill University, Montreal, QC, Canada. 3. Institute of Clinical Pharmacology and Toxicology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.
Abstract
PURPOSE: Studies on long-term utilization of non-vitamin K antagonist oral anticoagulants (NOACs) in non-valvular atrial fibrillation (NVAF) are scarce. We evaluated predictors of use and long-term persistence of NOACs in a real-world setting. METHODS: This population-based cohort study used the computerized databases of the Canadian Province of Quebec's health insurance. Patients with a first NVAF diagnosis from 2011 until 2014 were included. A logistic regression model yielded adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for predictors of treatment initiation with NOACs versus VKAs. Cox proportional hazards models yielded adjusted hazard ratios (HRs) and 95% CIs for predictors of switching from VKAs to NOACs versus remaining on VKAs, and for predictors of discontinuation of anticoagulation treatment. RESULTS: Of the 62 867 newly diagnosed NVAF patients, 14 646 initiated NOACs and 17 685 VKAs. Initiation with NOACs was less likely for patients ≥ 80 years old (OR 0.55, 95% CI 0.41-0.73) or with CHA2 DS2 -VASc ≥ 2 (OR 0.49, 95% CI 0.42-0.57). Switching from VKAs to NOACs was less likely for patients with chronic kidney disease (HR 0.53, 95% CI 0.48-0.59). After 3 years, persistence was 54% with NOACs and 25% with VKAs. Discontinuation of anticoagulation treatment was less likely for patients ≥ 80 years old (HR 0.47, 95% CI 0.40-0.55) or with CHA2 DS2 -VASc ≥ 2 (HR 0.64, 95% CI 0.57-0.70). CONCLUSIONS: Older, high-risk patients are less likely to initiate NOACs than VKAs. NOAC users show a higher long-term persistence than VKA users, and older, high-risk patients are less likely to discontinue anticoagulation treatment.
PURPOSE: Studies on long-term utilization of non-vitamin K antagonist oral anticoagulants (NOACs) in non-valvular atrial fibrillation (NVAF) are scarce. We evaluated predictors of use and long-term persistence of NOACs in a real-world setting. METHODS: This population-based cohort study used the computerized databases of the Canadian Province of Quebec's health insurance. Patients with a first NVAF diagnosis from 2011 until 2014 were included. A logistic regression model yielded adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for predictors of treatment initiation with NOACs versus VKAs. Cox proportional hazards models yielded adjusted hazard ratios (HRs) and 95% CIs for predictors of switching from VKAs to NOACs versus remaining on VKAs, and for predictors of discontinuation of anticoagulation treatment. RESULTS: Of the 62 867 newly diagnosed NVAFpatients, 14 646 initiated NOACs and 17 685 VKAs. Initiation with NOACs was less likely for patients ≥ 80 years old (OR 0.55, 95% CI 0.41-0.73) or with CHA2 DS2 -VASc ≥ 2 (OR 0.49, 95% CI 0.42-0.57). Switching from VKAs to NOACs was less likely for patients with chronic kidney disease (HR 0.53, 95% CI 0.48-0.59). After 3 years, persistence was 54% with NOACs and 25% with VKAs. Discontinuation of anticoagulation treatment was less likely for patients ≥ 80 years old (HR 0.47, 95% CI 0.40-0.55) or with CHA2 DS2 -VASc ≥ 2 (HR 0.64, 95% CI 0.57-0.70). CONCLUSIONS: Older, high-risk patients are less likely to initiate NOACs than VKAs. NOAC users show a higher long-term persistence than VKA users, and older, high-risk patients are less likely to discontinue anticoagulation treatment.
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