Brain oscillatory activity and CT perfusion in hyper-acute ischemic stroke.

Area of Science:

• Neuroscience
• Medical Imaging
• Neurology

Background:

• Neurovascular coupling is crucial in ischemic stroke.
• Early detection of stroke-related changes is vital for patient outcomes.
• Combining neuroimaging and electrophysiology may enhance understanding of acute stroke.

Purpose of the Study:

• To assess topographic electroencephalography (EEG) changes in the early phase of ischemic stroke.
• To compare EEG findings with hypoperfusion areas identified by computed tomography perfusion (CTP).
• To evaluate the utility of combined EEG and CTP in acute ischemic stroke.

Main Methods:

• 15 patients with ischemic stroke underwent CTP and EEG within 4.5 hours.
• Topographic power maps for each EEG frequency band were generated.
• EEG maps were compared with CTP-derived hypoperfusion areas.

Main Results:

• All patients exhibited a predominance of slow delta frequencies in EEG.
• A significant agreement was observed between the hemispheric prevalence of slow rhythms on EEG and CTP-identified hypoperfusion areas.
• This suggests EEG can map functional deficits corresponding to perfusion deficits.

Conclusions:

• Combined EEG and CTP are highly available techniques for acute ischemic stroke.
• This multimodal approach provides valuable information on functional and metabolic aspects of brain injury.
• The joint use of EEG and CTP offers enhanced clinical insight into the functionality of the injured brain area in the hyperacute phase.