Intracranial Atherosclerosis Assessed with 7-T MRI: Evaluation of Patients with Ischemic Stroke or Transient Ischemic Attack.

Background Intracranial atherosclerosis is an important cause of ischemic stroke and is associated with several vascular risk factors. Current imaging is mainly based on the assessment of luminal narrowing rather than abnormalities in the vessel wall. Purpose To investigate the relationship between vascular risk factors and atherosclerotic lesion burden of intracranial arteries assessed with vessel wall MRI at 7 T in participants with ischemic stroke or transient ischemic attack (TIA). Materials and Methods In this prospective study (trial identification number: NTR2119; www.trialregister.nl), study participants who presented with ischemic stroke or TIA of the anterior circulation between December 2009 and September 2017 underwent pre- and postcontrast 7-T vessel wall MRI within 3 months of symptom onset. All large arteries of the intracranial circulation were assessed for number, location, and enhancement of vessel wall lesions. Generalized estimating equations for Poisson regression were used to investigate the relationship between vascular risk factors and number or enhancement of vessel wall lesions. Results Ninety participants (52 men; mean age, 60 years) were evaluated. Increasing age (relative risk [RR], 1.02; 95% confidence interval [CI]: 1.01, 1.03), hypertension (RR, 1.46; 95% CI: 1.06, 2.02), diabetes mellitus (RR, 1.67; 95% CI: 1.20, 2.33), and a higher multivariable vascular risk score (Second Manifestations of Arterial Disease risk score) (RR, 1.01; 95% CI: 1.00, 1.02) were associated with a higher number of vessel wall lesions in the anterior circulation. Contrast material-enhancing vessel wall lesions were associated only with increasing age (RR, 1.03; 95% CI: 1.01, 1.05). No association was found between smoking and the number of vessel wall lesions. Conclusion Except for smoking, traditional common cardiovascular risk factors were associated with a higher number and enhancement of intracranial vessel wall lesions at 7-T MRI in individuals evaluated after ischemic stroke or transient ischemic attack. Published under a CC BY 4.0 license. Online supplemental material is available for this article.