Adjusted-Dose Warfarin versus Aspirin for Preventing Stroke in Patients with Atrial Fibrillation
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Letters16 October 2007Adjusted-Dose Warfarin versus Aspirin for Preventing Stroke in Patients with Atrial FibrillationRobert G. Hart, MD, Lesly A. Pearce, MS, and Maria I. Aguilar, MDRobert G. Hart, MDFrom the University of Texas Health Science Center, San Antonio, TX 78229-3900; Minot, ND 58703; and Mayo Clinic Scottsdale, Phoenix, AZ 85054., Lesly A. Pearce, MSFrom the University of Texas Health Science Center, San Antonio, TX 78229-3900; Minot, ND 58703; and Mayo Clinic Scottsdale, Phoenix, AZ 85054., and Maria I. Aguilar, MDFrom the University of Texas Health Science Center, San Antonio, TX 78229-3900; Minot, ND 58703; and Mayo Clinic Scottsdale, Phoenix, AZ 85054.Author, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-147-8-200710160-00018 SectionsAboutFull TextPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail TO THE EDITOR:The recently published, randomized Birmingham Atrial Fibrillation Treatment of the Aged (BAFTA) Study compared adjusted-dose warfarin (target international normalized ratio, 2.0 to 3.0) with aspirin (75 mg/d) in 973 patients with atrial fibrillation who were 75 years of age or older (mean age, 81.5 years) and were managed by general practitioners in the United Kingdom (1). The study's important results indicate that the relative efficacy and safety of warfarin for stroke prevention can be extended to very elderly patients who are managed by nonspecialists. Because the BAFTA Study seems likely to be the last large trial comparing ...References1. Mant J, Hobbs FD, Fletcher K, Roalfe A, Fitzmaurice D, Lip GY, et al. Warfarin versus aspirin for stroke prevention in an elderly community population with atrial fibrillation (the Birmingham Atrial Fibrillation Treatment of the Aged Study, BAFTA): a randomised controlled trial. Lancet. 2007;370:493-503. [PMID: 17693178] CrossrefMedlineGoogle Scholar2. Hart RG, Pearce LA, Aguilar MI. Meta-analysis: antithrombotic therapy to prevent stroke in patients who have nonvalvular atrial fibrillation. Ann Intern Med. 2007;146:857-67. [PMID: 17577005] LinkGoogle Scholar3. Petersen P, Boysen G, Godtfredsen J, Andersen ED, Andersen B. Placebo-controlled, randomised trial of warfarin and aspirin for prevention of thromboembolic complications in chronic atrial fibrillation. The Copenhagen AFASAK study. Lancet. 1989;1:175-9. [PMID: 2563096] CrossrefMedlineGoogle Scholar4. Petersen P, Boysen G. 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Clopidogrel plus aspirin versus oral anticoagulation for atrial fibrillation in the Atrial fibrillation Clopidogrel Trial with Irbesartan for prevention of Vascular Events (ACTIVE W): a randomised controlled trial. Lancet. 2006;367:1903-12. [PMID: 16765759] CrossrefMedlineGoogle Scholar12. NASPEAF Investigators. Comparative effects of antiplatelet, anticoagulant, or combined therapy in patients with valvular and nonvalvular atrial fibrillation: a randomized multicenter study. J Am Coll Cardiol. 2004;44:1557-66. [PMID: 15489085] CrossrefMedlineGoogle Scholar13. Vemmos KN, Tsivgoulis G, Spengos K, Manios E, Xinos K, Vassilopoulou S, et al. Primary prevention of arterial thromboembolism in the oldest old with atrial fibrillation—a randomized pilot trial comparing adjusted-dose and fixed low-dose coumadin with aspirin. Eur J Intern Med. 2006;17:48-52. [PMID: 16378886] CrossrefMedlineGoogle Scholar14. Rash A, Downes T, Portner R, Yeo WW, Morgan N, Channer KS. A randomised controlled trial of warfarin versus aspirin for stroke prevention in octogenarians with atrial fibrillation (WASPO). Age Ageing. 2007;36:151-6. [PMID: 17175564] CrossrefMedlineGoogle Scholar Author, Article, and Disclosure InformationAffiliations: From the University of Texas Health Science Center, San Antonio, TX 78229-3900; Minot, ND 58703; and Mayo Clinic Scottsdale, Phoenix, AZ 85054.Disclosures: None disclosed. PreviousarticleNextarticle Advertisement FiguresReferencesRelatedDetailsSee AlsoMeta-analysis: Antithrombotic Therapy to Prevent Stroke in Patients Who Have Nonvalvular Atrial Fibrillation Robert G. Hart , Lesly A. Pearce , and Maria I. 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A national, representative postal surveyThe pathophysiology and management of atrial fibrillation"Triple Therapy" or Triple Threat? 16 October 2007Volume 147, Issue 8Page: 590-592KeywordsAtrial fibrillationElderlySafetySafety studiesStrokeThromboembolism ePublished: 16 October 2007 Issue Published: 16 October 2007 CopyrightCopyright © 2007 by American College of Physicians. All Rights Reserved.PDF DownloadLoading ...
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".