The Scientific Medical Association of the Republic of Moldova
Doi
Abstract
Laboratory of Neurobiology and Medical Genetics Nicolae Testemitanu State University of Medicine and Pharmacy, Chisinau, the Republic of Moldova, The 75th anniversary of Nicolae Testemitanu State University of Medicine and Pharmacy of the Republic of Moldova (1945-2020)Background: Epilepsy has been considered as a brain network disorder. Advanced computational tools have granted a non-invasive window to explore the
brain networks in epilepsy. Studying the reorganization of brain networks can help in modelling the network topology changes related to focal epilepsy.
The present study aimed to explore the reorganization and resilience of brain networks in patients with focal epilepsy.
Material and methods: The structural 3T T1-weighted MR images of 40 patients with focal epilepsy and 40 healthy subjects, were processed by using
FreeSurfer. Cortical thickness values were used for the reconstruction of morphometric networks. The topological organization and resilience of brain
networks were assessed by applying the graph theoretical analysis.
Results: The topological organization of the brain networks in patients was marked by a higher clustering coefficient, local efficiency and path length (all
p<0.05) as compared to healthy individuals. The network hubs (i.e. brain regions responsible for network maintenance) were differently distributed in
patients (left superior temporal and right paracentral) and healthy subjects (left anterior cingulate and right superior temporal). The brain networks in
patients exhibited lower resilience (p<0.05) to targeted attacks (i.e. the removal of brain regions depending on their importance for network organization)
and similar resilience (p>0.05) to random attacks (i.e. random brain area removal).
Conclusions: Brain networks in focal epilepsy were characterized by an increased segregability and a decreased integrability. Reduced resilience to targeted
attacks in patients, as compared to healthy subjects, suggests an uneven importance of brain regions for network maintenance in the studied groups