Stratified, urgent care for transient ischemic attack results in low stroke rates.
OBJECTIVE
Transient ischemic attack (TIA) is a marker for early risk of stroke. No previous studies have assessed the use of urgent stroke prevention clinics for emergency department (ED) patients with TIA. We hypothesized that an ABCD2-based ED triaging tool for TIA with outpatient management would be associated with lower 90-day stroke rate than that predicted by ABCD2.


METHODS
A cohort of prospectively identified patients presenting with symptoms suggestive of TIA seen in 2 tertiary-care EDs. These patients were divided into 3 strata based on their ACBD2 score, and triage targets were set for each stratum. All patients received the same standard of care in the Stroke Clinic regardless of their risk score. Primary outcome was stroke by 90 days of index TIA. Secondary outcomes were subsequent TIA, myocardial infarction, or death.


RESULTS
One-thousand ninety-three patients met the inclusion criteria; 982 patients completed 90-day follow-up and comprised the final cohort. After stratification, 32%, 49%, and 19% of patients were categorized as low-, moderate-, or high-risk, respectively. The overall 90-day risk of stroke in all patients was 3.2%, compared with the ABCD2-predicted risk of 9.2%. Only 1.6% of patients with TIA/minor stroke were admitted from the ED. The risk of subsequent TIA, myocardial infarction, or death by 90 days was 5.5%, 0.1%, and 1.7%, respectively.


CONCLUSIONS
Outpatient care in a rapid-access stroke prevention clinic using the ABCD2 score for triage resulted in a low 90-day stroke rate for patients in the ED with TIA. Benefit occurred without requiring admission for most patients.
Division of Neurology, Ottawa Hospital, Ottawa, Ontario, Canada.
Jason
J
Wasserman
Jeff
J
Perry
Dar
D
Dowlatshahi
Grant
G
Stotts
Ian
I
Stiell
Jane
J
Sutherland
Cheryl
C
Symington
Mukul
M
Sharma
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000553:Ambulatory Care; D015331:Cohort Studies; D004636:Emergency Service, Hospital; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D002546:Ischemic Attack, Transient / Q000150:complications / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D009864:Ontario; D011446:Prospective Studies; D012307:Risk Factors; D012720:Severity of Illness Index; D020521:Stroke / Q000453:epidemiology / Q000517:prevention & control*; D013997:Time Factors; D014218:Triage