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Background: Effective early management of patients with transient ischaemic attacks (TIA) is undermined by an inability to predict who is at highest early risk of stroke. Methods: We derived a score for 7-day risk of stroke in a population-based cohort of patients (n=209) with a probable or definite TIA (Oxfordshire Community Stroke Project; OCSP), and validated the score in a similar population-based cohort (Oxford Vascular Study; OXVASC, n=190). We assessed likely clinical usefulness to front-line health services by using the score to stratify all patients with suspected TIA referred to OXVASC (n=378, outcome: 7-day risk of stroke) and to a hospital-based weekly TIA clinic (n=210; outcome: risk of stroke before appointment). Results: A six-point score derived in the OCSP (age [≥60 years=1], blood pressure [systolic >140 mm Hg and/or diastolic ≥90 mm Hg=1], clinical features [unilateral weakness=2, speech disturbance without weakness=1, other=0], and duration of symptoms in min [≥60=2, 10-59=1, <10=0]; ABCD) was highly predictive of 7-day risk of stroke in OXVASC patients with probable or definite TIA (p<0·0001), in the OXVASC population-based cohort of all referrals with suspected TIA (p<0·0001), and in the hospital-based weekly TIA clinic-referred cohort (p=0·006). In the OXVASC suspected TIA cohort, 19 of 20 (95%) strokes occurred in 101 (27%) patients with a score of 5 or greater: 7-day risk was 0·4% (95% CI 0-1·1) in 274 (73%) patients with a score less than 5, 12·1% (4·2-20·0) in 66 (18%) with a score of 5, and 31·4% (16·0-46·8) in 35 (9%) with a score of 6. In the hospital-referred clinic cohort, 14 (7·5%) patients had a stroke before their scheduled appointment, all with a score of 4 or greater. Conclusions: Risk of stroke during the 7 days after TIA seems to be highly predictable. Although further validations and refinements are needed, the ABCD score can be used in routine clinical practice to identify high-risk individuals who need emergency investigation and treatment.

Original publication

DOI

10.1016/S0140-6736(05)66702-5

Type

Journal article

Journal

Lancet

Publication Date

02/07/2005

Volume

366

Pages

29 - 36