Clinical features

Why?

• A fifth of patients with atrial fibrillation will have a stroke within 5 years (19%: 95% CI: 19% to 20%) ^a

AF increases the risk of stroke, especially with other risk factors

Strokes per year a	no other risk factors  (95% CI)	1 + other risk factor  (95% CI)
aged <65	1.0%  (0.3% to 3.1%)	4.9%  (3.0% to 8.1%)
aged 65 to 75	4.3%  (2.7% to 7.1%)	5.7%  (3.9% to 8.3%)
aged > 75	3.5%  (1.6% to 7.7%)	8.1%  (4.7% to 14%)