Early stroke risk is especially high in TIA patients with a high ABCD2 score of 4 or more (A age over 60 years [1 point]: B blood pressure > 140/90 mmHg [1 point]: C Clinical features, including unilateral weakness [2 points] and speech disturbance without weakness [1 point] D2: Diabetes [1 point] and Duration of symptoms [1 point for < 60 min and 2 points for > 60 min]), acute ischemic lesions on diffusion weighted image, > 50% carotid stenosis, severe intracranial artery stenosis, microembolic signals on transcranial Doppler, atrial fibrillation, or hypercoagulable states.