Frequency changes of sensorimotor EEG rhythm after revascularization surgery.

Area of Science:

• Neurosurgery
• Neurophysiology
• Cerebrovascular Surgery

Background:

• Extra-intracranial arterial bypass surgery (EIAB) is a procedure used to restore blood flow to the brain.
• Sensorimotor rhythms are brainwave patterns associated with motor control and sensation.
• Cortical infarction, or stroke, can affect brain function and may be an indication for EIAB.

Purpose of the Study:

• To investigate the changes in sensorimotor rhythm frequency before and after EIAB surgery.
• To determine if EIAB surgery impacts brain function, particularly in patients with cortical infarction.

Main Methods:

• EEG recordings were taken from 26 patients undergoing EIAB surgery.
• Power spectra analysis was used to measure the dominant frequency of sensorimotor rhythms.
• Preoperative and postoperative measurements were compared, with a focus on patients with cortical infarction.

Main Results:

• A significant preoperative frequency decrease (-0.47 Hz) was observed on the ischemic side in patients with cortical infarction.
• Postoperatively, a significant frequency decrease (-0.35 Hz) was noted on the operated side in the cortical infarction group.
• No significant frequency changes were found in patients without cortical infarction.

Conclusions:

• The unilateral postoperative frequency decrease in patients with cortical infarction suggests a temporary deterioration of brain function.
• Sensorimotor rhythm frequency may serve as a biomarker for brain function changes after EIAB surgery.
• Further research is warranted to understand the long-term implications and potential interventions.