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Impact of AF on stroke risk eliminated with multiple risk factors
Date:8/31/2013

Dr Benn Christiansen said: "We know that atrial fibrillation increases the risk of ischemic stroke. And in patients with atrial fibrillation or previous ischemic stroke, the risk of stroke increases with the number of risk factors. But until now, little attention has been paid to the association between stroke risk and risk factors in patients without prior stroke or atrial fibrillation. We wanted to explore that association and to quantify if stroke risk was of comparable size in patients with numerous risk factors."

The study included 4,198,119 people aged 18 to 90 years with no history of stroke from nationwide Danish registries during 2000 to 2010. Of these, 161,651 (3.85%) had atrial fibrillation. The investigators compared the risk of stroke in patients with and without atrial fibrillation according to the number of risk factors.

The risk factors included in the study were myocardial infarction, peripheral artery disease, arterial embolism, excessive alcohol consumption, heart failure, carotid stenosis, retinal occlusion, chronic systemic inflammation, chronic kidney disease, venous thromboembolism, epilepsy, migraine, diabetes mellitus, hypertension and age >75 years.

The rate of stroke was calculated per 100 person-years (see figure). Patients with 0 risk factors and no atrial fibrillation had a stroke rate of 0.32 (95% confidence interval [CI] 0.31-0.32) per 100 person-years vs. 2.55 (CI=2.47-2.64) in patients with atrial fibrillation. With 1-2 risk factors present the stroke rate was 1.77 (CI=1.76-1.78) (no atrial fibrillation) and 5.69 (CI=5.61-5.78) (with atrial fibrillation).

For patients with 3-4 risk factors the stroke rates were 4.88 (CI=4.80-4.96) without atrial fibrillation vs. 6.96 (CI=6.79-7.14) with atrial fibrillation. In the presence of 5 or more risk factors stroke rates were 7.27 (CI=6.82-7.74) without atrial fibrillation vs. 8.00 (CI=7.34-8.71) with atrial fibrillation.

Dr Benn Christians
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Contact: Celine Colas
press@escardio.org
44-773-005-7146
European Society of Cardiology
Source:Eurekalert

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