The document summarizes risk stratification scores for transient ischemic attack (TIA). The ABCD3-I score stratifies risk of stroke recurrence within 90 days into low risk (0-3 points), intermediate risk (4-7 points), and high risk (>8-13 points). The ABCD2 score further stratifies 2-day and 90-day risk of stroke based on age, blood pressure, clinical features, duration of symptoms, and diabetes. The ABCD2-I score adds points for acute infarction seen on MRI or CT imaging.

1. Risk stratification for TIA with ABCD3-I score
Score Risk for Recurrence
stroke within 90days
0-3 Low 2-3%
4-7 Intermediate <6%
8-13 High >18%
Lancet Neurol 2010;9:1060-69.

2. Risk stratification for TIA with ABCD2 score
ABCD2 Criteria Points
Age ≧ 60 years 1
Blood pressure ≧140/80 1
Clinical Unilateral weakness 2
Score 2day-risk Recurrence
features
for stroke within 90days
Speech impairment 1
without weakness 0-3 Low 1.0%
Duration of Sx >60minutes 2 4-5 Moderate 4.1%
6-7 High 8.1%
10-59 minutes 1
Diabetes Yes 1 JAMA 2000;284:2901-2906
ABCD2-I Points
ABCD2 + 7
I = (image) 3
MRI : acute infarction on DWI
CT : acute or old infarction Stroke 2010;41:1907-13

3. Recommendations for antithrombotic therapy
in patients with Af
a = Prior myocardial infarction, peripheral artery disease,
aortic plaque.