Memory complaints, memory disorders and focus localization in patients with partial epilepsy.

Area of Science:

• Neurology
• Neuropsychology
• Medical Imaging

Background:

• Partial epilepsy can significantly impact cognitive functions, particularly memory.
• Understanding the relationship between epileptic foci and memory impairment is crucial for patient management.

Purpose of the Study:

• To analyze the effects of epileptic foci on memory function in patients with partial epilepsy.
• To investigate correlations between electroencephalography (EEG), single photon emission computed tomography (SPECT), and computed tomography (CT) findings and memory deficits.

Main Methods:

• Twenty-eight patients with partial epilepsy and memory complaints underwent 21-channel EEG during cognitive testing.
• 99mTc-HMPAO SPECT and CT scans were performed to assess brain perfusion and structural abnormalities.
• Memory function was psychometrically assessed and categorized into global, verbal, and non-verbal impairments.

Main Results:

• No significant relationship was found between epilepsy-related factors (seizure type, frequency, age of onset, treatment) and memory impairment severity or type.
• No significant correlation between EEG focus localization and the severity of memory impairment was observed.
• Global amnesia was associated with hypoperfusion in SPECT (predominantly right frontal) and CT abnormalities (predominantly right parietal).
• Temporal lobe lesions on CT and SPECT were more common in patients with better memory performance.

Conclusions:

• Epileptic foci localization and common epilepsy-related factors do not directly predict memory impairment in partial epilepsy.
• Brain perfusion and structural abnormalities, particularly in the right frontal and parietal lobes, may be associated with severe memory deficits.
• The presence of temporal lobe lesions requires further investigation regarding its impact on memory in epilepsy.