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A Multimodal Imaging- and Stimulation-based Method of Evaluating Connectivity-related Brain Excitability in Patients with Epilepsy
Published on: November 13, 2016
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Continuous multi-modality brain imaging reveals modified neurovascular seizure response after intervention
Dene Ringuette1, Melanie A Jeffrey2, Suzie Dufour3
1The Institute of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, M5S 3G9, Canada.
Biomedical Optics Express
|March 9, 2017
Summary
This study reveals how brain blood flow, oxygenation, and calcium dynamics change during seizure-like events (SLEs). Interventions altered these responses, affecting seizure frequency and consistency.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Physiology
Background:
- Seizure-like events (SLEs) involve complex neurovascular and ionic changes.
- Understanding these dynamics is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the relationship between cerebral blood flow, blood oxygenation/volume, intracellular calcium, and electrographic activity during SLEs.
- To assess the impact of pharmacological intervention on these neurophysiological parameters.
Main Methods:
- Development of a multi-modal brain imaging system.
- Simultaneous monitoring of blood flow, blood oxygenation/volume, intracellular calcium, and electrographic activity.
- Observation of SLEs before and after pharmacological intervention.
Main Results:
- Rising blood volume was specific to SLE onset; blood flow correlated with electrographic activity.
- Intracellular calcium spiked at SLE onset and oscillated during SLEs.
- Intervention modified neurovascular and ionic responses, shortening and desynchronizing SLE intervals.
- Artery-vein flow comparison indicated vascular leakage before intervention.
Conclusions:
- Pharmacological intervention alters neurovascular coupling and ionic dynamics during SLEs.
- Changes in SLE interval and consistency suggest altered brain network function post-intervention.
- Multi-modal imaging provides critical insights into SLE pathophysiology.
Keywords:
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