Vertebrobasilar Flow Evaluation and Risk of Transient Ischemic Attack and Stroke (VERiTAS)

Completed

Conditions: Ischemic Attack, Transient
Cerebrovascular Disorder
Brain Ischemia
Vertebrobasilar Insufficiency
Stroke

Registration Number: NCT00590980

Lead Sponsor: Sepideh Amin-Hanjani

Brief Summary: Patients with blockage of the blood vessels that supply blood to the back of the brain, known as vertebrobasilar disease (VBD), are at risk of having a stroke or temporary symptoms of a stroke known as transient ischemic attack (TIA). The risk of repeated stroke associated with VBD may be affected by several risk factors, including the degree to which the blockage reduces the blood flow to the brain. Patients with VBD have different levels of blockage ranging from partial blockage to complete blockage, which can affect the blood flow to the brain by variable amounts. The purpose of this research is to determine if patients with symptomatic VBD who demonstrate low blood flow to the back of the brain on magnetic resonance (MR)imaging are at higher risk of developing another stroke or TIA than patients with normal blood flow.

Detailed Description: Approximately 700,000 strokes occur annually in the U.S. making it the third leading cause of death and the leading cause of permanent disability among adults. Over one third of strokes occur in the posterior circulation, the leading cause of which is vertebrobasilar occlusive disease secondary to atherosclerosis. Symptomatic vertebrobasilar disease (VBD) carries a high annual risk of stroke, averaging 10-15% per year despite medical therapy. This represents a potentially treatable high risk stroke etiology. Advances in endovascular angioplasty and stenting have created new treatment options, but these interventions carry significant risks, and the selection criteria for appropriate candidates remains uncertain. Determining predictors of stroke in this population is the first step toward identifying those high risk patients most suitable for consideration of intervention. Our preliminary studies suggest that the risk of stroke in VBD is strongly related to the extent to which intracranial blood flow is compromised.

The objective is to conduct a longitudinal study of patients with symptomatic VBD. Our central hypothesis is that patients with symptomatic VBD who demonstrate limitation of blood flow on quantitative magnetic resonance angiography (QMRA) are at higher risk of stroke.The primary aim of this proposal is to test the hypothesis that among patients with VBD, those with distal blood flow compromise are at higher risk of subsequent posterior circulation stroke than those with normal flow.

Secondary exploratory aims of the proposal are to determine:the correlation between large vessel flow measured by QMRA and tissue level perfusion measured by MR perfusion in the posterior circulation, and the predictive value of each; other predictive factors for stroke in this population; hemodynamic effects of varying degrees of vertebrobasilar stenosis; changes in hemodynamic status of patients on medical therapy over time; utility of QMRA as a non-invasive screening and monitoring tool in VBD.

The study is a prospective multi-center observational cohort study of patients with symptomatic angiographically confirmed vertebrobasilar atherostenosis (≥ 50%), or occlusion). Upon enrollment, patients will undergo hemodynamic assessment with noninvasive MR imaging (including QMRA and MR perfusion), the results of which will be kept blinded from treating physicians and the patients. Patients will be prospectively designated as demonstrating compromised or normal distal cerebral flow based upon an existing validated algorithm of individual posterior circulation vessel flow measurements. Baseline demographic, clinical and laboratory data will be gathered. Subsequently, patients will have monthly clinical follow-up and be re-imaged with QMRA at 6 month intervals for a minimum of 12 months. The primary endpoint will be stroke incidence in the vertebrobasilar territory at one year. Survival analysis methods, with censoring of patients not achieving endpoint at the end of the study period, will be used for comparison of patients with compromised versus normal blood flow.

The overall goal of the study is to define the population of patients with symptomatic VBD at highest risk of recurrent ischemic events. The information gained can significantly impact the selection criteria and likelihood for success of future clinical trials aimed at assessing the efficacy of endovascular or surgical interventions for the treatment of VBD. Moreover, the ability to define a low risk population in whom the risks of expensive invasive interventions would be unnecessary will have an equally important impact on the management of the disease both from a clinical and cost perspective. Data regarding the hemodynamic effects and changes over time of vertebrobasilar occlusive disease may also enhance our understanding of the basic pathophysiology and mechanisms of stroke in this morbid disease entity.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 82

Inclusion Criteria

Stroke or TIA in the vertebrobasilar territory
Conventional or CT angiographic demonstration of ≥50% stenosis or occlusion of extracranial or intracranial vertebrobasilar artery
Symptoms within 60 days of enrollment
Age 18 and above
Able to provide informed consent

Exclusion Criteria

Neurologic criteria:

Major disabling stroke prohibiting the ability to return for follow-up assessment
Any neurological disease which would confound follow-up assessment

Medical criteria:

Any severe co-morbidity condition with less than 12 month life expectancy
Known cardiac disease associated with cardioembolic risk specifically atrial fibrillation, prosthetic valves, endocarditis, left atrial/ventricular thrombus, cardiomyopathy with EF<25%, cardiac myxoma
Blood dyscrasias, specifically polycythemia vera, essential thrombocytosis, sickle cell disease

Disease criteria:

Non-atherosclerotic disease vertebrobasilar disease including dissection, fibromuscular dysplasia, vasculitis, radiation induced vasculopathy
Unilateral vertebral stenosis or occlusion

Patient criteria:

Unable or unwilling to undergo MRI or cerebral angiography or CTA
Pregnancy concurrent participation in an interventional trial for treatment of vertebrobasilar disease.
Renal dysfunction will be exclusionary if it precludes angiography. No subjects will be excluded based upon gender, race, ethnic group, religion or socioeconomic status. Children will not be recruited as atherosclerotic VBD is a condition that affects adults primarily in later life and is not a disease that occurs or is relevant in children.

Study & Design

Study Type: OBSERVATIONAL

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Fatal and Nonfatal Ischemic Stroke in the Vertebrobasilar Territory	up to 27 months	Definite fatal and nonfatal ischemic stroke in the vertebrobasilar territory

Secondary Outcome Measures

Name	Time	Method

Trial Locations

Locations (6): University of Illinois at Chicago
🇺🇸
Chicago, Illinois, United States
Washington University
🇺🇸
Saint Louis, Missouri, United States
Columbia University
🇺🇸
New York, New York, United States
University of California at Los Angeles - UCLA
🇺🇸
Los Angeles, California, United States
Jeffrey Kramer, MDSC at Mercy Hospital
🇺🇸
Chicago, Illinois, United States
UHN-Toronto Western Hospital
🇨🇦
Toronto, Ontario, Canada