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Association of Adding Aspirin to Warfarin Therapy Without an Apparent Indication With Bleeding and Other Adverse Events.

ABSTRACT: Importance:It is not clear how often patients receive aspirin (acetylsalicylic acid) while receiving oral anticoagulation with warfarin sodium without a clear therapeutic indication for aspirin, such as a mechanical heart valve replacement, recent percutaneous coronary intervention, or acute coronary syndrome. The clinical outcomes of such patients treated with warfarin and aspirin therapy compared with warfarin monotherapy are not well defined to date. Objective:To evaluate the frequency and outcomes of adding aspirin to warfarin for patients without a clear therapeutic indication for combination therapy. Design, Setting, and Participants:A registry-based cohort study of adults enrolled at 6 anticoagulation clinics in Michigan (January 1, 2010, to December 31, 2017) who were receiving warfarin therapy for atrial fibrillation or venous thromboembolism without documentation of a recent myocardial infarction or history of valve replacement. Exposure:Aspirin use without therapeutic indication. Main Outcomes and Measures:Rates of any bleeding, major bleeding events, emergency department visits, hospitalizations, and thrombotic events at 1, 2, and 3 years. Results:Of the study cohort of 6539 patients (3326 men [50.9%]; mean [SD] age, 66.1 [15.5] years), 2453 patients (37.5%) without a clear therapeutic indication for aspirin were receiving combination warfarin and aspirin therapy. Data from 2 propensity score-matched cohorts of 1844 patients were analyzed (warfarin and aspirin vs warfarin only). At 1 year, patients receiving combination warfarin and aspirin compared with those receiving warfarin only had higher rates of overall bleeding (cumulative incidence, 26.0%; 95% CI, 23.8%-28.3% vs 20.3%; 95% CI, 18.3%-22.3%; P?

SUBMITTER: Schaefer JK

PROVIDER: S-EPMC6450296 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Association of Adding Aspirin to Warfarin Therapy Without an Apparent Indication With Bleeding and Other Adverse Events.

Schaefer Jordan K JK Li Yun Y Gu Xiaokui X Souphis Nicole M NM Haymart Brian B Kline-Rogers Eva E Almany Steven L SL Kaatz Scott S Kozlowski Jay H JH Krol Gregory D GD Sood Suman L SL Froehlich James B JB Barnes Geoffrey D GD

JAMA internal medicine 20190401 4

<h4>Importance</h4>It is not clear how often patients receive aspirin (acetylsalicylic acid) while receiving oral anticoagulation with warfarin sodium without a clear therapeutic indication for aspirin, such as a mechanical heart valve replacement, recent percutaneous coronary intervention, or acute coronary syndrome. The clinical outcomes of such patients treated with warfarin and aspirin therapy compared with warfarin monotherapy are not well defined to date.<h4>Objective</h4>To evaluate the f ...[more]

PMID: 30830172

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Project description:Much of the clinical epidemiology and treatment patterns for patients with atrial fibrillation (AF) are derived from Western populations. Limited data are available on antithrombotic therapy use over time and its impact on the stroke or bleeding events in newly diagnosed Chinese patients with AF. The present study investigates time trends in warfarin and aspirin use in China in relation to stroke and bleeding events in a Chinese population.We used a medical insurance database involving > 10 million individuals for the years 2001 to 2012 in Yunnan, a southwestern province of China, and performed time-trend analysis on those with newly diagnosed AF. Cox proportional hazards time-varying exposures were used to determine the risk of stroke or bleeding events associated with antithrombotic therapy among patients with AF.Among the randomly sampled 471,446 participants, there were 1,237 patients with AF, including 921 newly diagnosed with AF, thus providing 4,859 person-years of experience (62% men; mean attained age, 70 years). The overall rate of antithrombotic therapy was 37.7% (347 of 921 patients), with 4.1% (38 of 921) on warfarin and 32.3% (298 of 921) on aspirin. Antithrombotic therapy was not related to stroke/bleeding risk scores (CHADS2 [congestive heart failure, hypertension, age ? 75 years, diabetes, stroke (doubled)] score, P = .522; CHA2DS2-VASc [congestive heart failure, hypertension, age ? 75 years (doubled), diabetes mellitus, stroke or transient ischemic attack (doubled), vascular disease, age 65 to 74 years, and female sex] score, P = .957; HAS-BLED [hypertension, abnormal renal/liver function, stroke, bleeding history or predisposition, labile international normalized ratio, elderly (> 65 years), drugs/alcohol concomitantly] score, P = .095). The use of antithrombotic drugs (mainly aspirin) increased in both women and men over time, with the rate of aspirin increasing from 4.0% in 2007 to 46.1% in 2012 in the former, and from 7.7% in 2007 to 61.9% in 2012 in the latter (P for trend for both, < .005). In the overall cohort, the annual stroke rate was approximately 6% and the annual major bleeding rate was about 1%. Compared with nonantithrombotic therapy, the hazard ratio for ischemic stroke was 0.68 (95% CI, 0.39-1.18) for aspirin and 1.39 (0.54-3.59) for warfarin.Aspirin use increased among Chinese patients newly diagnosed with AF, with no relationship to the patient's stroke or bleeding risk. Warfarin use was very low. Given the health-care burden of AF and its complications, our study has major implications for health-care systems in non-Western countries, given the global burden of this common arrhythmia.

Project description:ImportanceThe role for aspirin in cardiovascular primary prevention remains controversial, with potential benefits limited by an increased bleeding risk.ObjectiveTo assess the association of aspirin use for primary prevention with cardiovascular events and bleeding.Data sourcesPubMed and Embase were searched on Cochrane Library Central Register of Controlled Trials from the earliest available date through November 1, 2018.Study selectionRandomized clinical trials enrolling at least 1000 participants with no known cardiovascular disease and a follow-up of at least 12 months were included. Included studies compared aspirin use with no aspirin (placebo or no treatment).Data extraction and synthesisData were screened and extracted independently by both investigators. Bayesian and frequentist meta-analyses were performed.Main outcomes and measuresThe primary cardiovascular outcome was a composite of cardiovascular mortality, nonfatal myocardial infarction, and nonfatal stroke. The primary bleeding outcome was any major bleeding (defined by the individual studies).ResultsA total of 13 trials randomizing 164 225 participants with 1 050 511 participant-years of follow-up were included. The median age of trial participants was 62 years (range, 53-74), 77 501 (47%) were men, 30 361 (19%) had diabetes, and the median baseline risk of the primary cardiovascular outcome was 9.2% (range, 2.6%-15.9%). Aspirin use was associated with significant reductions in the composite cardiovascular outcome compared with no aspirin (57.1 per 10 000 participant-years with aspirin and 61.4 per 10 000 participant-years with no aspirin) (hazard ratio [HR], 0.89 [95% credible interval, 0.84-0.95]; absolute risk reduction, 0.38% [95% CI, 0.20%-0.55%]; number needed to treat, 265). Aspirin use was associated with an increased risk of major bleeding events compared with no aspirin (23.1 per 10 000 participant-years with aspirin and 16.4 per 10 000 participant-years with no aspirin) (HR, 1.43 [95% credible interval, 1.30-1.56]; absolute risk increase, 0.47% [95% CI, 0.34%-0.62%]; number needed to harm, 210).Conclusions and relevanceThe use of aspirin in individuals without cardiovascular disease was associated with a lower risk of cardiovascular events and an increased risk of major bleeding. This information may inform discussions with patients about aspirin for primary prevention of cardiovascular events and bleeding.

Dataset Information

Association of Adding Aspirin to Warfarin Therapy Without an Apparent Indication With Bleeding and Other Adverse Events.

Publications

Association of Adding Aspirin to Warfarin Therapy Without an Apparent Indication With Bleeding and Other Adverse Events.

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