Prolonged Perfusion Predicts Recurrent Ischemic Stroke but not Transient Ischemic Attack in Patients with Symptomatic Intracranial Stenosis

Title:Prolonged Perfusion Predicts Recurrent Ischemic Stroke but not Transient Ischemic Attack in Patients with Symptomatic Intracranial Stenosis

Volume: 14 Issue: 2

Author(s): Linfang Lan, Xinyi Leng, Vincent Ip, Thomas Leung, Yannie Soo, Jill Abrigo*Ka Sing Wong*

Affiliation:

• Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, 999077,China

• Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong, 999077,China

Keywords: Intracranial arterial stenosis, computed tomography perfusion, recurrent ischemic stroke, prognosis, transient ischemic attack.

Abstract: Background: Intracranial arterial stenosis (ICAS) is the dominant cause for ischemic stroke worldwide, with hemodynamic compromise as a crucial contributor. Prolonged perfusion is commonly observed in ICAS patients on CT perfusion (CTP) maps, while the clinical significance of this perfusion pattern has not been elucidated.

Method: Patients having symptomatic ICAS of 50-99% stenosis with sustained downstream cerebral blood flow (CBF) were enrolled in this study. Prolonged perfusion was defined as increased mean transit time (MTT) in vascular territories of the target ICAS on CTP maps. The primary clinical outcome was recurrence of ipsilateral ischemic stroke, and secondary outcome was any ipsilateral ischemic events at 2 years follow-up.

Results: Of the 95 patients (median age 61y; 70% males) with symptomatic ICAS, 29 patients (30.5%) had prolonged perfusion. Such delayed perfusion was persistent in a majority of patients according to the 1-year imaging follow-up. The prolongation of cerebral perfusion was associated with subsequent risk for ipsilateral ischemic stroke (HR 7.01; 95% CI 1.86-26.46; p = 0.004), but not for any ipsilateral ischemic events (HR 1.52; 95% CI 0.63-3.68; p = 0.348). Further comparison of perfusion measures showed lower CBF (p = 0.034) and higher MTT (p = 0.064) in patients with recurrent ischemic stroke, but not in those with recurrent transient ischemic attack (TIA). Among patients with recurrent stroke, a majority had multiple infarcts along the borderzone regions.

Conclusion: In patients with symptomatic ICAS, persistent prolonged cerebral perfusion might contribute to the relapse of ischemic stroke, but not TIA.

Cite this article as:

Lan Linfang, Leng Xinyi, Ip Vincent, Leung Thomas, Soo Yannie, Abrigo Jill*, Wong Sing Ka*, Prolonged Perfusion Predicts Recurrent Ischemic Stroke but not Transient Ischemic Attack in Patients with Symptomatic Intracranial Stenosis, Current Neurovascular Research 2017; 14 (2) . https://dx.doi.org/10.2174/1567202614666170413143203

DOI https://dx.doi.org/10.2174/1567202614666170413143203	Print ISSN 1567-2026
Publisher Name Bentham Science Publisher	Online ISSN 1875-5739