Excitotoxicity and metabolic changes in association with infarct progression

Area of Science:

• Neuroscience
• Neurology
• Stroke Research

Background:

• Malignant hemispheric stroke (MHS) is a severe condition characterized by rapid brain swelling and high mortality.
• Delayed infarct progression contributes to poor outcomes in MHS patients.
• Understanding the mechanisms driving delayed infarct progression is crucial for developing effective therapies.

Purpose of the Study:

• To investigate the association between excitotoxicity and metabolic alterations in the peri-infarct region and delayed infarct progression in MHS patients.
• To identify potential biomarkers for predicting infarct expansion.

Main Methods:

• Microdialysis probes were used to measure glutamate, glucose, pyruvate, and lactate levels in the peri-infarct tissue of 18 MHS patients for 5 days.
• Intraoperative laser speckle imaging ensured precise probe placement.
• Serial MRI scans were performed to assess infarct volume and progression.

Main Results:

• 50% of patients exhibited delayed infarct progression.
• Patients with delayed progression showed lower glucose and pyruvate levels and elevated glutamate and lactate-pyruvate ratio in the peri-infarct area.
• These metabolic changes were particularly evident early after surgery at the 15-mm probe location.

Conclusions:

• Excitotoxicity and metabolic derangements in the peri-infarct region are significantly associated with delayed infarct progression in MHS.
• These findings suggest that targeting excitotoxic and metabolic pathways could be a promising therapeutic strategy for MHS.