Certain risk factors may increase the risk of stroke in patients with atrial fibrillation.
Risk factors:
(1) age of the patient
(2) concurrent conditions
(3) past medical history
Age of Patient
Concurrent Condition(s)
Risk (annual risk without anticoagulation)
< 65 years of age
none
low (annual risk 1%)
< 65 years of age
hypertension or diabetes
medium (annual risk 4%)
> 65 years of age
none
medium
>= 75 years of age
hypertension or diabetes
high (annual risk 8%)
any
history of transient ischemic attack or cerebrovascular accident
high (annual rate 12%)
large left atrium; impaired left ventricular function; intracardiac thrombus; valvular lesions; calcifications of the mitral valve
high
where:
• The risk for the age interval of 65-74 with hypertension or diabetes is not explicit in the table. In the implementation these will be indicated as medium risk.
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