Use of oral anticoagulants in combination with antiplatelet(s) in atrial fibrillation.

OBJECTIVES: To investigate temporal trends in the use of non-vitamin K oral anticoagulants (NOACs) and vitamin K antagonists (VKAs) in combination with aspirin and/or clopidogrel in patients with atrial fibrillation (AF) following acute myocardial infarction (MI) and/or percutaneous coronary intervention (PCI). METHODS: Using Danish nationwide registries, all patients with AF who survived 30 days after discharge from MI and/or PCI between 22 August 2011 and 30 September 2016 were identified. RESULTS: A total of 2946 patients were included in the study population, of whom 1967 (66.8%) patients were treated with VKA in combination with antiplatelet(s) (VKA+aspirin n=477, VKA+clopidogrel n=439, VKA+aspirin+clopidogrel n=1051) and 979 (33.2%) patients were treated with NOAC in combination with antiplatelet(s) (NOAC+aspirin n=252, NOAC+clopidogrel n=218, NOAC+aspirin+clopidogrel n=509). The overall study population had a median age of 76 years [IQR: 69-82] and consisted of 1995 (67.7%) men. Patients with MI as inclusion event accounted for 1613 patients (54.8%). Patients with high CHA2DS2-VASc score(congestive heart failure, hypertension, age ≥75 years (2 points), diabetes mellitus, history of stroke/transient ischemic attack/systemic thromboembolism (2 points), vascular disease, age 65-75 years, and female sex) accounted for 132 2814 (95.5%) of patients, and patients with high HAS-BLED score (hypertension, abnormal renal/liver function, history of stroke, history of bleeding, age >65 years, non-steroidal anti-inflammatory drug usages, or alcohol abuse, leaving out labile international normalized ratio (not available), and use of antiplatelets (exposure variable)) accounted for 934 (31.7%) of patients. There was an increase from 10% in 2011 to 52% in 2016 in the use of NOACs in combination with antiplatelet(s). CONCLUSION: From 2011 to 2016, the use of NOAC in combination with antiplatelet(s) increased in patients with AF following MI/PCI and exceeded the use of VKA in combination with antiplatelet(s) by 2016.

Comparative safety and effectiveness of rivaroxaban versus VKAs in patients with venous thromboembolism. A Danish nationwide registry-based study.

The approval of rivaroxaban has changed the landscape of treatment of venous thromboembolism (VTE). Little is known about the effect of rivaroxaban compared with vitamin K antagonists (VKA), when used in the everyday clinical practice. The aim of this study was to investigate the safety and effectiveness of rivaroxaban compared with VKAs among patients with VTE, using the Danish nationwide registries. All patients diagnosed with VTE and treated with either rivaroxaban or VKAs between 2013 and 2015 were included. A total of 12,318 patients were diagnosed with VTE and treated with VKAs [n=6,907] or rivaroxaban [n=5,411.]. Combined Cox regression analyses showed that the standardised absolute six-month risk of recurrent VTE was 3.03 % [95 % CI: 2.57 % to 3.48 %] in the rivaroxaban group and 3.13 % [95 % CI: 2.70 % to 3.56 %] in the VKA group (absolute risk difference of -0.11 % [95 % CI: -0.76 % to 0.54 %]). The standardised absolute six-months risk of bleeding was 2.28 % [95 % CI: 1.87 % to 2.67 %] for patients in the rivaroxaban group and 2.10 % [95 % CI: 1.78 % to 2.43 %] in the VKA group (absolute risk difference of 0.18 % [95 % CI: -0.34 % to 0.67]). In conclusion, rivaroxaban was associated with similar risk of recurrent VTE and bleeding compared with VKA.

Adherence with oral anticoagulation in non-valvular atrial fibrillation: a comparison of vitamin K antagonists and non-vitamin K antagonists.

Aims: The purpose of this study was to describe adherence with non-vitamin K antagonists (NOACs) and vitamin K antagonists (VKA) in patients with non-valvular atrial fibrillation (NVAF). Methods and results: By linkage of Danish nationwide registers, we identified patients with NVAF who claimed a prescription of a NOAC (dabigatran, rivaroxaban, and apixaban), or a VKA. Adherence was evaluated according to Proportions of Days Covered, refill gaps, and switch in treatment. Adjusted analyses were calculated with logistic regression and Cox proportional hazard models. Between 2011 and 2014, 46 675 patients with NVAF claimed a prescription of anticoagulation (OAC): 57.3% used VKA, 29.8% dabigatran, 8.5% rivaroxaban, and 4.4% apixaban. During the first 180 days, PDC >80% was the highest among users of rivaroxaban. Compared with rivaroxaban, OR was 0.79 with apixaban (95% CI 0.69-0.92), 0.72 with dabigatran (95% CI 0.66-0.80), and 0.76 with VKAs (95% CI 0.69-0.83). HR for refill gaps between 7 and 89 days of length were (rivaroxaban as reference): apixaban 1.52(95% CI 1.36-1.69), dabigatran 1.72 (95% CI 1.60-1.85), and VKA 2.36(95% CI 2.20-2.52). Refill gaps of more than 89 days occurred in 11.5% of VKA recipients, with substantially lower rates for patients treated with NOAC. Switch between OACs was the highest in users of dabigatran (21.0%) and the lowest in users of apixaban (8.6%). Conclusion: Among NVAF patients treated with OAC, 42.7% received a NOAC. PDC > 80%, and periods without refill gaps were the highest among users of rivaroxaban. Refill gaps occurred most often with VKA, switch was most common with dabigatran use.

Familial Clustering of Venous Thromboembolism - A Danish Nationwide Cohort Study.

BACKGROUND: Identification of risk factors for venous thromboembolism (VTE) is of utmost importance to improve current prophylactic regimes and treatment guidelines. The extent to which a family history contributes to the risk of VTE needs further exploration. OBJECTIVES: To examine the relative rate of VTE in first-degree relatives compared with the general population. METHODS: By crosslinking Danish nationwide registries we identified patients with VTE between 1978 and 2012, and their familial relations. The first member in a family to acquire VTE was defined as the proband. All first-degree relatives to probands were followed from the VTE date of the proband and until an event (VTE), death, emigration, 100 year birthday or end of study: 31st of December 2012, whichever came first. The relative rate of VTE was estimated by standardized incidence ratios (SIR) using time-dependent Poisson regression models, with the general population as a fixed reference. RESULTS: We identified 70,767 children of maternal probands, 66,065 children of paternal probands, and 29,183 siblings to sibling probands. Having a maternal proband or a paternal proband were associated with a significantly increased VTE rate of 2.15 (CI: 2.00-2.30) and 2.06 (CI: 1.92-2.21), respectively. The highest estimate of VTE was observed among siblings (adjusted SIR of 2.60 [CI: 2.38-2.83]). Noteworthy, the rate of VTE increased for all first-degree relatives when the proband was diagnosed with VTE in a young age (≤ 50 years). CONCLUSION: A family history of VTE was associated with a significantly increased rate of VTE among first-degree relatives compared with the general population.