Fig. 2.

Classification of the 136 patients based on the presence/absence of acute/remote infarct at baseline, distribution of the infarcts, degree of carotid stenosis, and test results available in patients' charts (such as EKG and Holter) – but independent of carotid wall CT features. Of note, none of the 40 "carotid stroke patients" had any history of atrial fibrillation documented in their medical records. Patients with 20% > carotid stenosis > 50% were classified as "carotid stroke" patients only in case of a prior history of two or more ischemic stroke, transient ischemic attack, or transient monocular blindness from the territory of index artery, at least one event within the last month, according to the Causative Classification System for Ischemic Stroke.^{33 34}