Atrial fibrillation

Oral anticoagulation

NNT 167
(Aspirin 100–250 mg)

Oral anticoagulation

NNT <15

NNT <85

No medication

NNT >500
(Aspirin 100-250 mg)

End

Risk of stroke?

Very high risk

HASH(0x2f82ff8)10%/year

Stroke or TIA
Arterial embolism
Mitral stenosis
Artificial valve

High risk

HASH(0x2f82ff8)2–4%/year

CHA₂DS₂ – VASc≥2

Intermediate risk

HASH(0x2f82ff8)1–2%/year

CHA₂DS₂ – VASc = 1

Low risk

<1%/year

CHA₂DS₂ – VASc = 0