Enhanced thalamo-hippocampal synchronization during focal limbic seizures.
Epilepsia
; 59(9): 1774-1784, 2018 09.
Article
in En
| MEDLINE
| ID: mdl-30039519
ABSTRACT
OBJECTIVE:
The key factors that promote the termination of focal seizures have not been fully clarified. The buildup of neuronal synchronization during seizures has been proposed as one of the possible activity-dependent, self-limiting mechanisms. We investigate if increased thalamo-cortical coupling contributes to enhance synchronization during the late phase of focal seizure-like events (SLEs) generated in limbic regions.METHODS:
Recordings were simultaneously performed in the nucleus reuniens of the thalamus, in the hippocampus and in the entorhinal cortex of the isolated guinea pig brain during focal bicuculline-induced SLEs with low voltage fast activity at onset.RESULTS:
Spectral coherence and cross-correlation analysis demonstrated a progressive thalamo-cortical entrainment and synchronization in the generation of bursting activity that characterizes the final part of SLEs. The hippocampus is the first activated structure at the beginning of SLE bursting phase and thalamo-hippocampal synchronization is progressively enhanced as SLE develops. The thalamus takes the lead in generating the bursting discharge as SLE end approaches.SIGNIFICANCE:
As suggested by clinical studies performed during pre-surgical intracranial monitoring, our data confirm a role of the midline thalamus in leading the synchronous bursting activity at the end of focal seizures in the mesial temporal regions.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Seizures
/
Midline Thalamic Nuclei
/
Hippocampus
/
Neural Pathways
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
Epilepsia
Year:
2018
Document type:
Article
Affiliation country:
Italia