Canadian Transient Ischemic Attack Score

Background

• Risk score used to risk stratify patients who present with transient ischemic attack and minor stroke
• Predicts risk of stroke within 7 days

Criteria

Item	Score
Clinical
First TIA in lifetime	+2
Symptoms lasting 10 minutes or longer	+2
History of carotid artery stenosis	+2
Already on antiplatelet therapy	+3
History of gait disturbance	+1
History of unilateral weakness	+1
History of vertigo	-3
Initial triage DBP ≥110 mmHg	+3
Dysarthria or aphasia on history of examination	+1
ED Investigations
Atrial fibrillation on ECG	+2
Infarction (new or old) on CT	+1
Platelet count ≥400	+2
Glucose ≥15 mmol/L	+3

Interpretation

Canadian TIA Score	% Risk of Stroke	Risk Category
-3	0.01%	low risk
-2	0.01-0.03%
-1	0.03%
0	0.04%
1	0.07%
2	0.11%
3	0.2%
4	0.3%	medium risk
5	0.5%
6	0.8%
7	1.2%
8	2%
9	3.2%	high risk
10	5.1%
11	8.1%
12	12.6%
13	19%
14	27.6%
≥15	>27.6%