Predicting Stroke Risk in Intracranial Atherosclerotic Disease with Novel High Resolution,Functional and Molecular MRI Techniques - Resubmission - 1

利用新型高分辨率、功能性和分子 MRI 技术预测颅内动脉粥样硬化疾病的中风风险 - 重新提交 - 1

• 批准号: 10053118
• 负责人: Sameer A Ansari
• 金额: $ 62.49万
• 依托单位: UNIVERSITY OF CHICAGO
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10053118
• 关键词: Acetazolamide; Age-Years; Algorithms; Angioplasty; Arterial Fatty Streak; Arteries; Aspirin; Atherosclerosis; Biological Markers; Blood; Blood Vessels; Blood coagulation; Brain; Breathing; Carbon Dioxide; Cardiac; Cerebrovascular system; Chronic; Chronic Disease; Clinical; Complex; Contrast Media; Death Rate; Disease; Distal; Ensure; Evaluation; Event; Exhibits; Geometry; Goals; Head; Hemorrhage; Hospitals; Human; Hypertension; Image; Imaging Techniques; Inferior; Infiltration; Inflammation; Inflammatory; Intracranial Arterial Stenosis; Intracranial Atheroscleroses; Iron; Ischemic Stroke; Lesion; MRI Scans; Magnetic Resonance Imaging; Mathematics; Measures; Medical; Methodology; Molecular; Multicenter Trials; Natural History; Oxygen; Pathologic; Pathology; Pathway interactions; Patient risk; Patients; Perfusion; Permeability; Pharmaceutical Preparations; Plavix; Population; Prevalence; Prevention; Preventive treatment; Probability; Procedures; Protocols documentation; Recurrence; Reference Standards; Reporting; Research; Resolution; Rest; Risk; Risk Factors; Risk Management; Risk stratification; Role; Route; Rupture; Smoking; Stenosis; Stents; Stress; Stroke; Stroke prevention; Systems Theory; Thrombus; Time; Tissue imaging; Tissues; Vascular blood supply; Vascular resistance; Vasodilation; Warfarin; Work; base; cerebrovascular; clinical translation; contrast enhanced; falls; ferumoxytol; hemodynamics; high risk; high risk population; hypoperfusion; imaging biomarker; improved; innovation; intracranial artery; macrophage; magnetic resonance imaging biomarker; multidisciplinary; neurovascular; novel; patient population; perfusion imaging; physiologic stressor; pressure; prevent; response; single photon emission computed tomography; standard of care; stroke risk; success; thromboembolic stroke; tissue oxygenation; uptake; vasa vasorum; vascular bed

Project Summary/Abstract The long-term goal of this work is to reduce the incident of stroke by identifying the most vulnerable patients using MRI scans. Currently roughly 1 of every 8 patient who have had an initial stroke from intracranial atherosclerosis disease (ICAD) will suffer a second stroke within a year. Patients who are likely to fail medical management have loss of cerebrovascular reserve, poor collateral arterial blood supply, and/or plaque that is vulnerable to rupture from active macrophage infiltration. Our goal is to identify vulnerable patients to inform the selection for new medical management protocols, stenting or stent-less angioplasty. We will develop a suite of new MRI scans and evaluate them in the intended patient population, comparing to reference standard CO2 Challenge CVR, HMPAO SPECT or direct imaging of active macrophages. Significance: ICAD is one of the most common causes of stroke worldwide and carries an extremely a high risk of recurrent stroke. ICAD patients with severe stenosis (70 to 99%) are at particularly high risk for recurrent stroke in the vascular territory of the stenosis (~12 to 20% within 12 months) despite treatment with aspirin, Plavix and management of risk factors (hypertension, smoking etc). The use of new, preventative treatment including angioplasty, new anti-platelet medication would benefit if the most vulnerable patient can be identified. Our imaging biomarkers will improve risk stratification for the of stroke in a vulnerable, high risk population. Innovation: We have developed time resolve MRI scans that are targeted to risk factor of stroke in ICAD: (1) Cardiac Gated “Snapshot” images of transient changes in the cerebral vasculature in response to arterial pressure changes induced by the cardiac cycle. These changes are muted by a loss of cerebrovascular reserve a risk fact of stroke. (2) A new mathematical deconvolution algorithm based on linear time-invariant system theory to quantify perfusion supplied to a vascular bed through collateral arterial blood supply distal to a stenosis. (3) First ever high-resolution permeability of the intracranial arterial walls to identify macrophage infiltration. Scientific Rigor: The geometry of the human head and topology of the vasculature are unique, and we therefore perform all our studies in the intended patient population: humans with ICAD. To ensure scientific rigor, we will compare directly to reference standard values of CO2 cerebrovascular reserve, collateral arterial supply, and macrophage infiltration in plaques. Probability of Success: We have built a strong, multi-disciplinary team with a long track record of successful, collaborative neurovascular research. We believe this high probability of successful completion of the aims and high likelihood of clinical translation.

项目总结/文摘