Positron emission tomographic study of postinfarction seizures

Area of Science:

• Neurology
• Neuroimaging
• Epileptology

Background:

• Thromboembolic stroke in the middle cerebral artery territory can lead to late-onset epilepsy.
• The relationship between stroke, brain metabolism, and post-stroke seizures requires further investigation.

Purpose of the Study:

• To investigate regional cerebral blood flow (rCBF) and oxygen consumption (rCMRO2) using positron emission tomography (PET) in stroke patients with and without late-onset epilepsy.
• To compare metabolic changes in the infarcted area, border zones, and contralateral hemispheres between epileptic and non-epileptic stroke groups.

Main Methods:

• Positron emission tomography (PET) with steady-state technique using oxygen-15 ((15)O).
• Study included 18 patients 4-14 months post-thromboembolic stroke.
• Comparison between 8 patients with post-stroke seizures and 10 without.

Main Results:

• Patients with post-stroke seizures exhibited a more significant decrease in rCBF and rCMRO2 within the infarcted area compared to non-epileptic stroke patients.
• No significant differences in PET findings were observed in the infarct border areas or contralateral hemispheres between the groups.
• Demographic and clinical characteristics (age, etiology, stroke location, neurological deficit) were comparable between the groups.

Conclusions:

• Reduced rCBF and rCMRO2 in the infarcted zone are associated with post-stroke epilepsy.
• The causal relationship between these metabolic changes and seizure occurrence remains undetermined.