Bottom line: ABCD2 score appears to be most predictive of the scoring systems for stroke risk after TIA. Patients with low ABCD2 scores (≤3) may be at low risk for an early disabling ischemic stroke, but about 20% of those patients may still be at high risk for disease requiring immediate treatment. Also, ABCD2 may overestimate stroke risk at 90 days.
For details of evidence regarding ABCD2 prediction rule, see the TIA article in DynaMed, Prognosis Section.
ABCD2 is a prediction rule for identifying patients with TIA who may be at increased risk of a stroke in the short term. Score is calculated based on:
- Age 60 years +, 1 point
- Blood pressure: systolic > 140 mm Hg and/or diastolic > 90 mm Hg, 1 point
- Clinical features 2 points for unilateral weakness and 1 point for speech disturbance no weakness
- Duration of symptoms, 2 points for 60 minutes or more, 1 point less than 60 minutes
- Diabetes, 1 point