Blood Vessel Anatomy and Blood Flow Regulation
The Impact of Cerebral Anatomical Variations on Cerebrovascular Reactivity
4 other identifiers
observational
80
1 country
1
Brief Summary
Brain blood flow regulation will be measured in response to environmental changes using MRI.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P50-P75 for all trials
Started Jul 2022
Longer than P75 for all trials
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
May 25, 2022
CompletedFirst Posted
Study publicly available on registry
May 31, 2022
CompletedStudy Start
First participant enrolled
July 19, 2022
CompletedPrimary Completion
Last participant's last visit for primary outcome
July 1, 2026
ExpectedStudy Completion
Last participant's last visit for all outcomes
July 1, 2026
July 18, 2025
July 1, 2025
4 years
May 25, 2022
July 17, 2025
Conditions
Keywords
Outcome Measures
Primary Outcomes (2)
Cerebral Vascular Reactivity to Hypercapnia
The change in brain blood flow using MRI will be measured in response to a hypercapnic breathing test. The participants cerebral vascular reactivity to hypercapnia will be compared between the controls (without VAH) and those with VAH.
One study visit, up to 120 minutes in the MRI
Cerebral Blood Flow Response to Hypoxia
The change in brain blood flow using MRI will be measured in response to a hypoxic breathing test. The participants cerebral blood flow response to hypoxia will be compared between the controls (without VAH) and those with VAH.
One study visit, up to 120 minutes in the MRI
Study Arms (2)
Controls
Healthy controls
Vertebral Artery Hypoplasia
Healthy individuals with vertebral artery hypoplasia
Interventions
Participants will undergo an MRI scan while participating in two breathing tests (hypercapnia and hypoxia) to measure brain blood flow.
Eligibility Criteria
Subjects for this study, will include healthy adults enrolled in the Wisconsin Alzheimer's Disease Research Clinical Core. Both men and women are eligible to participate in this study.
You may qualify if:
- BMI ≤38.5 kg/m2
- Nonsmoker
- Female subjects: postmenopausal
- Currently enrolled in the Wisconsin Alzheimer's Disease Research Clinical Core
You may not qualify if:
- Diagnosis of mild cognitive impairment or Alzheimer's disease
- Uncontrolled hypertension
- History or evidence of hepatic disease, hematological disease, or peripheral vascular disease
- Severe kidney injury requiring hemodialysis
- Cardiovascular disease including: severe congestive heart failure, coronary artery disease, ischemic heart disease (stents, coronary artery bypass grafts) and tachycardia
- History of clinically significant ischemic or hemorrhagic stroke, or significant cerebrovascular disease
- History of HIV/AIDS
- Severe untreated obstructive sleep apnea
- History of diabetes with HbA1c greater than 9.5%
- Major neurologic disorders other than dementia (e.g., multiple sclerosis, amyotrophic lateral sclerosis, brain surgery, etc.)
- Current or recent (\<1 year) major psychiatric condition (Axis I) or addictive disorders
- Contraindications to MRI
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
University of Wisconsin-Madison
Madison, Wisconsin, 53706, United States
Related Publications (32)
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PMID: 15258116BACKGROUND
Biospecimen
Serum blood samples will be retained for future analysis.
Study Officials
- PRINCIPAL INVESTIGATOR
Jill N Barnes, PhD
University of Wisconsin, Madison
Study Design
- Study Type
- observational
- Observational Model
- CASE CONTROL
- Time Perspective
- PROSPECTIVE
- Sponsor Type
- OTHER
- Responsible Party
- SPONSOR
Study Record Dates
First Submitted
May 25, 2022
First Posted
May 31, 2022
Study Start
July 19, 2022
Primary Completion (Estimated)
July 1, 2026
Study Completion (Estimated)
July 1, 2026
Last Updated
July 18, 2025
Record last verified: 2025-07
Data Sharing
- IPD Sharing
- Will not share