scholarly journals Edoxaban versus warfarin on stroke risk in patients with atrial fibrillation: a territory-wide cohort study

Author(s):  
Dicken Kong ◽  
Jiandong Zhou ◽  
Sharen Lee ◽  
Keith Sai Kit Leung ◽  
Tong Liu ◽  
...  

AbstractBackgroundIn this territory-wide, observational, propensity score-matched cohort study, we evaluate the development of transient ischaemic attack and ischaemic stroke (TIA/Ischaemic stroke) in patients with AF treated with edoxaban or warfarin.MethodsThis was an observational, territory-wide cohort study of patients between January 1st, 2016 and December 31st, 2019, in Hong Kong. The inclusion were patients with i) atrial fibrillation, and ii) edoxaban or warfarin prescription. 1:2 propensity score matching was performed between edoxaban and warfarin users. Univariate Cox regression identifies significant risk predictors of the primary, secondary and safety outcomes. Hazard ratios (HRs) with corresponding 95% confidence interval [CI] and p values were reported.ResultsThis cohort included 3464 patients (54.18% males, median baseline age: 72 years old, IQR: 63-80, max: 100 years old), 664 (19.17%) with edoxaban use and 2800 (80.83%) with warfarin use. After a median follow-up of 606 days (IQR: 306-1044, max: 1520 days), 91(incidence rate: 2.62%) developed TIA/ischaemic stroke: 1.51% (10/664) in the edoxaban group and 2.89% (81/2800) in the warfarin group. Edoxaban was associated with a lower risk of TIA or ischemic stroke when compared to warfarin.ConclusionsEdoxaban use was associated with a lower risk of TIA or ischemic stroke after propensity score matching for demographics, comorbidities and medication use.

2020 ◽  
Vol 41 (10) ◽  
pp. 1100-1108 ◽  
Author(s):  
Huei-Kai Huang ◽  
Peter Pin-Sung Liu ◽  
Jin-Yi Hsu ◽  
Shu-Man Lin ◽  
Carol Chiung-Hui Peng ◽  
...  

Abstract Aims To evaluate the fracture risk among patients with atrial fibrillation (AF) treated with non-vitamin K antagonist oral anticoagulants (NOACs) or warfarin. Methods and results We conducted a real-world nationwide retrospective cohort study using Taiwan’s National Health Insurance Research Database. All adult patients in Taiwan newly diagnosed with AF between 2012 and 2016 who received NOACs or warfarin were enrolled and followed up until 2017. Patients treated with NOACs were sub-grouped according to the NOAC used (dabigatran, rivaroxaban, and apixaban). Propensity score matching was performed for each head-to-head comparison. Cox regression analysis, with a shared frailty model, was used to calculate the adjusted hazard ratios (aHRs) for hip, vertebral, and humerus/forearm/wrist fractures. After matching, 19 414 patients were included (9707 in each NOAC and warfarin groups). The median follow-up time was 2.4 years. Compared with warfarin, NOACs were associated with a reduced fracture risk [aHR = 0.84, 95% confidence interval (CI) = 0.77–0.93; P < 0.001]. Sub-analyses revealed that each NOAC, namely dabigatran (aHR = 0.88, 95% CI = 0.78–0.99; P = 0.027), rivaroxaban (aHR = 0.81, 95% CI = 0.72–0.90; P < 0.001), and apixaban (aHR = 0.67, 95% CI = 0.52–0.87; P = 0.003), had a reduced fracture risk. Analyses including all eligible patients, without propensity score matching, generated similar results. Conclusion Compared with warfarin, NOAC was associated with a reduced fracture risk among AF patients. Therefore, if oral anticoagulants are indicated, NOACs rather than warfarin should be considered to lower the risk of fractures. However, further studies are needed to investigate the underlying mechanisms and elucidate causality.


Stroke ◽  
2021 ◽  
Author(s):  
Yi-Hsin Chan ◽  
Tze-Fan Chao ◽  
Hsin-Fu Lee ◽  
Shao-Wei Chen ◽  
Pei-Ru Li ◽  
...  

Background and Purpose: Data on clinical outcomes for nonvitamin K antagonist oral anticoagulant (NOACs) and warfarin in patients with atrial fibrillation and cancer are limited, and patients with active cancer were excluded from randomized trials. We investigated the effectiveness and safety for NOACs versus warfarin among patients with atrial fibrillation with cancer. Methods: In this nationwide retrospective cohort study from Taiwan National Health Insurance Research Database, we identified a total of 6274 and 1681 consecutive patients with atrial fibrillation with cancer taking NOACs and warfarin from June 1, 2012, to December 31, 2017, respectively. Propensity score stabilized weighting was used to balance covariates across study groups. Results: There were 1031, 1758, 411, and 3074 patients treated with apixaban, dabigatran, edoxaban, and rivaroxaban, respectively. After propensity score stabilized weighting, NOAC was associated with a lower risk of major adverse cardiovascular events (hazard ratio, 0.63 [95% CI, 0.50–0.80]; P =0.0001), major adverse limb events (hazard ratio, 0.41 [95% CI, 0.24–0.70]; P =0.0010), venous thrombosis (hazard ratio, 0.37 [95% CI, 0.23–0.61]; P <0.0001), and major bleeding (hazard ratio, 0.73 [95% CI, 0.56–0.94]; P =0.0171) compared with warfarin. The outcomes were consistent with either direct thrombin inhibitor (dabigatran) or factor Xa inhibitor (apixaban, edoxaban, and rivaroxaban) use, among patients with stroke history, and among patients with different type of cancer and local, regional, or metastatic stage of cancer ( P interaction >0.05). When compared with warfarin, NOAC was associated with lower risk of major adverse cardiovascular event, and venous thrombosis in patients aged <75 but not in those aged ≥75 years ( P interaction <0.05). Conclusions: Thromboprophylaxis with NOACs rather than warfarin should be considered for the majority of the atrial fibrillation population with cancer.


Author(s):  
Chinmay G Deshpande ◽  
Cynthia Willey Temkin ◽  
Robert Laforge ◽  
Stephen Kogut

Introduction: Dabigatran and Rivaroxaban have shown better or similar efficacy to lower stroke risk compared to warfarin in clinical trials. Evidence suggests adherence to cardiac drugs tend to reduce outcomes and cost. Our study is the first to examine the impact of atleast 6 to 12 month adherence to NOACs on ischemic stroke, major bleeding, Deep Vein Thrombosis and Pulmonary Embolism (DVTPE) risk in a propensity score based matched sample. Methods: A retrospective cohort study utilized de-identified data from Optum® Clinformatics™ Data Mart database (OptumInsight, Eden Prairie, MN) (Jan 1, 2010 and Dec 31, 2012). Adult patients with ≥ 1 diagnosis of atrial fibrillation or flutter (ICD9 427.31/32), >1 prescription of NOACs, 6 months pre-index continuous enrollment and CHA2DS2VASC score >1 were included. Adherence was calculated using Proportion of Days Covered (PDC ≥80%) for atleast 6 and 12 months of NOAC use and cohorts (adherent vs. non adherent) were matched on propensity score using Inverse Probability Treatment Weighting (IPTW) controlling for demographic and clinical characteristics at baseline. The risk of ischemic stroke, major bleeding (primary outcomes) and DVTPE (exploratory outcome) was evaluated for the matched cohorts post adherence assessment using Cox regression. Results: Out of 25,150 NOAC patients, a total of 3,629 and 1,946 patients with atleast 6 and 12 months of NOAC use were included. Across 2 cohorts, the mean age of the sample was 65 years, 65% were males and >60% had a moderate-high risk of stroke (CHA2DS2VASC>2). Adherence (PDC ≥80%) was 77% and 76% for patients with 6 and 12 month drug use. Post 12 months of drug use, the overall incidence of bleeding, stroke, and DVTPE in the follow-up period was 4.42%, 1.80%, and 0.82% respectively. Each outcome was analyzed separately to avoid calculation of competing risks. Using Cox models with IPTW balanced cohorts, non-adherence was significantly (p ≤0.05) associated with an increase in stroke (≥ 1.5 fold) and DVTPE (≥ 2 fold) risk in both 6 and 12 month users. The risk of bleeding was not significantly different across adherent vs. non adherent users (Table). Conclusion: In our sample, adherence to NOACs was associated with a reduction in stroke and DVTPE risk but did not substantially increase bleeding risk. Further studies with newer NOACs are warranted.


Author(s):  
Joris J Komen ◽  
Tomas Forslund ◽  
Aukje K Mantel-Teeuwisse ◽  
Olaf H Klungel ◽  
Mia von Euler ◽  
...  

Abstract Aims To analyze 90-day mortality in AF patients after a stroke or a severe bleed and assess associations with the type of antithrombotic treatment at the event. Methods and Results From the Stockholm Healthcare database, we selected 6 017 patients with a known history of AF who were diagnosed with ischemic stroke, 3 006 with intracranial hemorrhage, and 4 291 with a severe gastrointestinal bleed (GIB). The 90-day mortality rates were 25.1% after ischemic stroke, 31.6% after intracranial hemorrhage, and 16.2% after severe GIB. We used Cox regression and propensity score matched analyses to test the association between antithrombotic treatment at the event and 90-day mortality. After intracranial hemorrhage, there was a significantly higher mortality rate in warfarin compared to NOAC treated patients (adjusted hazard ratio (aHR): 1.36 CI: 1.04 – 1.78). After an ischemic stroke and a severe GIB, patients receiving antiplatelets or no antithrombotic treatment had significantly higher mortality rates compared to patients on NOACs, but there was no difference comparing warfarin to NOACs (aHR 0.84 CI: 0.63 – 1.12 after ischemic stroke, aHR 0.91 CI: 0.66 – 1.25 after severe GIB). Propensity score matched analysis yielded similar results. Conclusion Mortality rates were high in AF patients suffering from an ischemic stroke, an intracranial hemorrhage, or a severe GIB. NOAC treatment was associated with a lower 90 day mortality after intracranial hemorrhage than warfarin.


BMJ Open ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. e048734
Author(s):  
Qi Yu ◽  
Yuanzhe Wu ◽  
Qingdong Jin ◽  
Yanqing Chen ◽  
Qingying Lin ◽  
...  

ObjectiveTo develop and internally validate a prediction model for 6-year risk of stroke and its primary subtypes in middle-aged and elderly Chinese population.DesignThis is a retrospective cohort study from a prospectively collected database.ParticipantsWe included a total 3124 adults aged 45–80 years, free of stroke or myocardial infarction at baseline in the 2009–2015 cohort of China Health and Nutrition Survey.Primary and secondary outcome measuresThe outcome of the prediction model was stroke. Investigated predictors were: age, gender, body mass index (BMI), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), total cholesterol (TC), hypertension (HBP), drinking status, smoking status, diabetes and site. Stepwise multiple Cox regression was applied to identify independent predictors. A nomogram was constructed to predict 6-year risk of stroke based on the multiple analysis results. Bootstraps with 1000 resamples were applied to both C-index and calibration curve.ResultThe overall incidence of overall stroke was 2.98%. Age, gender, HBP and TC were found as significant risk predictors for overall stroke; age, gender, HBP and LDL-C were found as significant risk predictors for ischaemic stroke; age, gender, HBP, BMI and HDL-C were found as significant risk predictors for haemorrhagic stroke. The nomogram was constructed using significant variables included in the model, with a C-index of 0.74 (95% CI: 0.72 to 0.76), 0.74 (95% CI: 0.71 to 0.77), and 0.81 (95% CI: 0.78 to 0.84) for overall stroke, ischaemic stroke, and haemorrhagic stroke model, respectively. The calibration curves demonstrated the good agreements between predicted and observed 6-year risk probability.ConclusionOur nomogram could be convenient, easy to use and effective prognoses for predicting 6-year risk of stroke in middle-aged and elderly Chinese population.


PLoS Medicine ◽  
2021 ◽  
Vol 18 (6) ◽  
pp. e1003659
Author(s):  
Hyo-Jeong Ahn ◽  
So-Ryoung Lee ◽  
Eue-Keun Choi ◽  
Kyung-Do Han ◽  
Jin-Hyung Jung ◽  
...  

Background There is a paucity of information about cardiovascular outcomes related to exercise habit change after a new diagnosis of atrial fibrillation (AF). We investigated the association between exercise habits after a new AF diagnosis and ischemic stroke, heart failure (HF), and all-cause death. Methods and findings This is a nationwide population-based cohort study using data from the Korea National Health Insurance Service. A retrospective analysis was performed for 66,692 patients with newly diagnosed AF between 2010 and 2016 who underwent 2 serial health examinations within 2 years before and after their AF diagnosis. Individuals were divided into 4 categories according to performance of regular exercise, which was investigated by a self-reported questionnaire in each health examination, before and after their AF diagnosis: persistent non-exercisers (30.5%), new exercisers (17.8%), exercise dropouts (17.4%), and exercise maintainers (34.2%). The primary outcomes were incidence of ischemic stroke, HF, and all-cause death. Differences in baseline characteristics among groups were balanced considering demographics, comorbidities, medications, lifestyle behaviors, and income status. The risks of the outcomes were computed by weighted Cox proportional hazards models with inverse probability of treatment weighting (IPTW) during a mean follow-up of 3.4 ± 2.0 years. The new exerciser and exercise maintainer groups were associated with a lower risk of HF compared to the persistent non-exerciser group: the hazard ratios (HRs) (95% CIs) were 0.95 (0.90–0.99) and 0.92 (0.88–0.96), respectively (p < 0.001). Also, performing exercise any time before or after AF diagnosis was associated with a lower risk of mortality compared to persistent non-exercising: the HR (95% CI) was 0.82 (0.73–0.91) for new exercisers, 0.83 (0.74–0.93) for exercise dropouts, and 0.61 (0.55–0.67) for exercise maintainers (p < 0.001). For ischemic stroke, the estimates of HRs were 10%–14% lower in patients of the exercise groups, yet differences were statistically insignificant (p = 0.057). Energy expenditure of 1,000–1,499 MET-min/wk (regular moderate exercise 170–240 min/wk) was consistently associated with a lower risk of each outcome based on a subgroup analysis of the new exerciser group. Study limitations include recall bias introduced due to the nature of the self-reported questionnaire and restricted external generalizability to other ethnic groups. Conclusions Initiating or continuing regular exercise after AF diagnosis was associated with lower risks of HF and mortality. The promotion of exercise might reduce the future risk of adverse outcomes in patients with AF.


Author(s):  
Johan Holm ◽  
Buster Mannheimer ◽  
Rickard E Malmström ◽  
Erik Eliasson ◽  
Jonatan D Lindh

Abstract Purpose To study the association between interacting drugs and bleeding or thromboembolism in atrial fibrillation outpatients treated with non-vitamin K antagonist oral anticoagulants (NOACs). Methods Population-based cohort study of outpatients treated with NOACs in Sweden from 2008 to 2017. Patients with atrial fibrillation and newly initiated NOAC treatment were identified in the Prescribed Drug Register. Comorbidities and outcome data were retrieved from the Patient Register and the Cause of Death Register. Cox-regression analyses were performed to evaluate the primary endpoints any severe bleed and ischemic stroke/transient ischemic attack/stroke unspecified during the first six months of treatment. Secondary endpoints were gastrointestinal bleeding, intracranial bleeding, ischemic stroke, and venous thromboembolism. Results Increased risk of any severe bleed was found when NOAC treatment, and drugs with pharmacodynamic effect on bleeding were combined, compared to NOAC only. An increased risk with these combinations was evident for apixaban (hazard ratio (HR) 1.47; 95% CI 1.33–1.63), rivaroxaban (HR 1.7; 95% CI 1.49–1.92), and dabigatran (HR 1.26; 95% CI 1.05–1.52). For apixaban, there was an increased risk of any severe bleed when combined with CYP3A4 and/or P-glycoprotein (P-gp) inhibitors (HR 1.23; 95% CI 1.01–1.5). The use of inducers of CYP3A4 and/or P-gp was low in this cohort, and effects on ischemic stroke/TIA/stroke unspecified could not be established. Conclusion Increased risk of bleeding was seen for pharmacodynamic and pharmacokinetic interactions with NOACs. Prescribers need to be vigilant of the effect of interacting drugs on the risk profile of patients treated with NOACs.


Circulation ◽  
2018 ◽  
Vol 137 (suppl_1) ◽  
Author(s):  
Nemin Chen ◽  
Richard F MacLehose ◽  
Lin Y Chen ◽  
Faye L Norby ◽  
Lindsay G Bengtson ◽  
...  

Background: Current guidelines recommend oral anticoagulation for the prevention of stroke in most patients with atrial fibrillation (AF). Direct oral anticoagulants (DOACs) are associated with lower risk of ischemic stroke and intracranial bleeding than warfarin and, therefore, may reduce risk of dementia among patients with AF. Hypothesis: AF patients initiating DOACs for stroke prevention will have lower risk of dementia than patients initiating warfarin. Methods: We used data from two US healthcare claim databases, MarketScan (2007-2015) and Optum Clinformatics (2009-2015). Using validated algorithms, we identified patients with AF who initiated oral anticoagulation. Dementia was defined as having an International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) code of 290.xx, 294.xx, or 331.0. Comorbidities and use of other medications were defined based on inpatient, outpatient, and pharmacy claims. We performed a series of head-to-head comparisons of different oral anticoagulants (warfarin, dabigatran, rivaroxaban, and apixaban) in propensity score-matched cohorts. In each database, multivariable-adjusted Cox regression models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for incident dementia for each comparison of propensity score-matched cohorts, adjusting for age, sex, comorbidities, use of other medications, and markers of socioeconomic status (in the Optum database only). We meta-analyzed database-specific results using a random-effects model. Results: The analysis included 307,099 AF patients from the MarketScan database and 161,346 from the Optum database, of which 6,572 and 4,391 respectively had a diagnosis of incident dementia. Mean follow up ranged between 0.7 to 2.3 years and incident of diagnosed dementia between 7 to 14 cases per 1000 person-years across different oral anticoagulant initiator groups. Patients initiating DOACs had a lower risk of incident dementia than those initiating warfarin (dabigatran: HR 0.85, 95%CI 0.71, 1.01; rivaroxaban: HR 0.85, 95%CI 0.76, 0.94; apixaban: HR 0.80, 95%CI 0.65, 0.97). There were no differences in risk of incident dementia comparing DOAC user groups (dabigatran vs. rivaroxaban: HR 1.02, 95%CI 0.79, 1.32; dabigatran vs. apixaban: HR 0.92, 95%CI 0.63, 1.36; apixaban vs. rivaroxaban: HR 1.01, 95%CI 0.86, 1.19). Conclusions: Patients with AF initiating DOACs experienced lower rates of incident dementia than warfarin users. No obvious benefit was observed for any particular DOAC in relation to dementia rates.


2019 ◽  
Vol 40 (Supplement_1) ◽  
Author(s):  
J J Komen ◽  
T Forslund ◽  
A K Mantel - Teeuwisse ◽  
O H Klungel ◽  
B Wettermark ◽  
...  

Abstract Background Anticoagulation treatment reduces the risk of stroke but increases the risk of bleeding in atrial fibrillation (AF) patients. There is little data on survival after a stroke or a severe bleed. Objective To analyze 90-day mortality in AF patients after an ischemic stroke, an intracranial hemorrhage (ICH) or a gastrointestinal bleed (GIB) and assess associations with the type of antithrombotic treatment preceding the event. Methods From the Stockholm Healthcare database (n=2.3 million inhabitants) we selected all AF patients suffering from an ischemic stroke, an intracranial bleed, or a severe GIB requiring acute hospital care between July 2011 and August 2018 and assessed 90-day mortality rates. We assessed current use of warfarin, non-vitamin K oral anticoagulants (NOAC), or antiplatelet agents at the time of the event. We used a Cox regression to calculate adjusted hazard ratios (aHRs), adjusting for components of the Charlson Comorbidity Index, the CHADsVASc score, the HAS-BLED score, comedication, and year of inclusion, for the association between treatment preceding the event and mortality. In addition, we performed log-rank tests in propensity score matched cohorts. Results Of 105 313 patients with AF, 6 017 were included after an ischemic stroke, 3 006 after an ICH, and 4 291 after a GIB. 90-day mortality rates were 25.1%, 31.6% and 16.2%, respectively. Patients suffering from an ischemic stroke were the oldest at 81.6±9.8 (S.D:) years of age followed by patients suffering from an ICH (80.2±9.8 years) or a GIB (78.7±10.5 years). A large proportion of patients suffering ischemic stroke (72%) had no anticoagulant treatment preceding the event. After ICH, there was a significantly increased risk of mortality in warfarin compared to NOAC treated patients after adjusting for confounders (aHR: 1.36 CI: 1.04–1.78). Patients receiving antiplatelets or no treatment had significantly higher mortality rates than patients on NOAC treatment, both after an ischemic stroke and a GIB, but there was no significant difference between warfarin and NOACs (aHR 0.84 CI: 0.63–1.12 after ischemic stroke, aHR 0.91 CI: 0.66–1.25 after GIB). Propensity score matched analyses yielded similar results. Survival curves after event Conclusion Mortality rates are high in AF patients suffering from an ischemic stroke, an ICH, or a GIB. NOAC treatment was associated with a lower 90-day mortality after ICH than warfarin, but no such difference was found after ischemic stroke or GIB. After ischemic stroke and GIB, mortality rates were higher in antiplatelet treated and untreated patients compared to NOAC treated patients. Acknowledgement/Funding Swedish Heart Lung Foundation


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