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Using Retinal Imaging to Study Dementia
Published on: November 6, 2017
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Cardiovascular brain impulses in Alzheimer's disease
Zalán Rajna1, Heli Mattila2, Niko Huotari2
1Center for Machine Vision and Signal Analysis, University of Oulu, 90570 Oulu, Finland.
Brain : a Journal of Neurology
|March 31, 2021
Summary
Alzheimer's disease (AD) shows abnormal brain blood flow patterns. New MRI methods reveal altered cardiovascular impulse propagation in AD patients, impacting brain fluid clearance and amyloid-β buildup.
Area of Science:
- Neuroscience
- Cardiovascular Science
- Medical Imaging
Background:
- Amyloid-β accumulation is central to Alzheimer's disease (AD) neuropathology.
- Cerebral hemodynamic alterations, including arterial impulse propagation and cerebrospinal fluid (CSF) flux, are linked to AD progression.
Purpose of the Study:
- To introduce a novel non-invasive method for quantifying 3D cardiovascular impulse propagation in the human brain.
- To investigate spatio-temporal abnormalities in brain impulse propagation in Alzheimer's disease patients.
Main Methods:
- Utilized ultrafast 10 Hz magnetic resonance encephalography (MRE).
- Developed a non-invasive technique to map 3D cardiovascular impulse propagation in the brain.
- Analyzed arrival latency, propagation speed, and arterial territory modifications.
Main Results:
- Identified significant spatio-temporal abnormalities in impulse propagation in AD patients compared to controls.
- Observed differences in arrival latency and propagation speed of cardiovascular impulses in AD.
- Detected AD-specific modifications, including reversed impulse propagation around the hippocampi and in parietal cortical areas.
Conclusions:
- Pervasive abnormalities in perivascular CSF impulse propagation are implicated in Alzheimer's disease.
- Compromised vascular impulse propagation may impair glymphatic clearance of amyloid-β in AD.
- The findings suggest a link between hemodynamic alterations and AD pathophysiology.
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