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  • Title: Oral Anticoagulation and the Risk of Stroke or Death in Patients With Atrial Fibrillation and One Additional Stroke Risk Factor: The Loire Valley Atrial Fibrillation Project.
    Author: Fauchier L, Lecoq C, Clementy N, Bernard A, Angoulvant D, Ivanes F, Babuty D, Lip GY.
    Journal: Chest; 2016 Apr; 149(4):960-8. PubMed ID: 26425935.
    Abstract:
    BACKGROUND: It remains uncertain whether patients with atrial fibrillation (AF) and a single additional stroke risk factor (congestive heart failure, hypertension, age ≥ 75 years, diabetes mellitus, prior stroke or thromboembolism, vascular disease, age 65-74 years, and sex category [CHA2DS2-VASc] score = 1 in men, 2 in women) should be treated with oral anticoagulation (OAC). We investigated the risk of ischemic stroke, systemic embolism, and death in a community-based cohort of unselected patients with AF with zero to one stroke risk factor based on the CHA2DS2-VASc score. METHODS: Among 8,962 patients with AF seen between 2000 and 2010, 2,177 (24%) had zero or one additional stroke risk factor, of which 53% were prescribed OAC. RESULTS: Over a follow-up of 979 ± 1,158 days, 151 (7%) had a major adverse event (stroke/systemic thromboembolism/death). Prescription of OAC was not associated with a better prognosis for stroke/systemic thromboembolism/death for patients in the "low-risk" category (ie, CHA2DS2-VASc score = 0 for men or 1 for women; adjusted hazard ratio [HR], 0.68; 95% CI, 0.35-1.31; P = .25). OAC use was independently associated with a better prognosis in patients with AF with a single additional stroke risk factor (ie, CHA2DS2-VASc score = 1 in men, 2 in women; adjusted HR, 0.59; 95% CI, 0.40-0.86; P = .007). CONCLUSIONS: Among patients with AF with a single additional stroke risk factor (CHA2DS2-VASc score = 1 in men, 2 in women), OAC use was associated with an improved prognosis for stroke/systemic thromboembolism/death.
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