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Using three cohorts of patients from Oxford, England, these authors sought to develop rules to predict the risk for stroke in the 7 days after diagnosis of transient ischemic attack (TIA). Other studies have identified risk factors for stroke after TIA, usually assessing longer periods. In the current study, the authors evaluated these same risk factors as potential short-term predictors in a total of 190 patients with TIA identified in the 1980s. From that analysis, they derived a stroke risk score, the ABCD score:
A (age; 1 point for age >60 years),
B (blood pressure; 1 point for hypertension at the acute evaluation),
C (clinical features; 2 points for focal weakness, 1 for speech disturbance without weakness), and
D (symptom duration; 1 poin…