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

This study is ongoing, but not recruiting participants.
Sponsor:
Collaborator:
Information provided by (Responsible Party):
Sepideh Amin-Hanjani, University of Illinois at Chicago
ClinicalTrials.gov Identifier:
NCT00590980
First received: December 28, 2007
Last updated: August 1, 2013
Last verified: August 2013

December 28, 2007
August 1, 2013
July 2008
December 2014   (final data collection date for primary outcome measure)
Fatal and nonfatal ischemic stroke in the vertebrobasilar territory [ Time Frame: one year ] [ Designated as safety issue: No ]
Same as current
Complete list of historical versions of study NCT00590980 on ClinicalTrials.gov Archive Site
  • Ischemic stroke in any vascular territory [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • All ischemic stroke and vascular death [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • Aggregate of any ischemic stroke, myocardial infarction and vascular death [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • All stroke (ischemic and hemorrhagic) [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • All death (vascular and nonvascular) [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • Neurological impairment as determined by the NIH Stroke Scale [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • Neurological disability as determined by the modified Barthel Index [ Time Frame: one to two years ] [ Designated as safety issue: No ]
  • Handicap as determined by the modified Rankin Scale [ Time Frame: one to two years ] [ Designated as safety issue: No ]
Same as current
Not Provided
Not Provided
 
Vertebrobasilar Flow Evaluation and Risk of Transient Ischemic Attack and Stroke (VERiTAS)
The Vertebrobasilar Flow Evaluation and Risk of Transient Ischemic Attack and Stroke (VERiTAS) Study

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.

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 consist of 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.

Observational
Observational Model: Cohort
Time Perspective: Prospective
Not Provided
Not Provided
Non-Probability Sample

Neurology/Neurosurgery Clinic

  • Vertebrobasilar Insufficiency
  • Ischemic Attack, Transient
  • Cerebrovascular Disorder
  • Brain Ischemia
  • Stroke
Not Provided
Observation
Patients with intracranial or extracranial vertebrobasilar occlusion or stenosis ≥ 50% presenting with vertebrobasilar distribution TIA or stroke.
Amin-Hanjani S, Du X, Zhao M, Walsh K, Malisch TW, Charbel FT. Use of quantitative magnetic resonance angiography to stratify stroke risk in symptomatic vertebrobasilar disease. Stroke. 2005 Jun;36(6):1140-5. Epub 2005 May 12.

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Active, not recruiting
80
December 2014
December 2014   (final data collection date for primary outcome measure)

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.
Both
18 Years and older
No
Contact information is only displayed when the study is recruiting subjects
United States,   Canada
 
NCT00590980
2006-0599, 5R01NS059745
No
Sepideh Amin-Hanjani, University of Illinois at Chicago
Sepideh Amin-Hanjani
National Institute of Neurological Disorders and Stroke (NINDS)
Principal Investigator: Sepideh Amin-Hanjani, MD University of Illinois, Department of Neurosurgery
University of Illinois at Chicago
August 2013

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP