Impaired default mode network on resting-state FMRI in children with medically refractory epilepsy

Area of Science:

• Neuroscience
• Pediatric Neurology
• Epilepsy Research

Background:

• The default mode network (DMN) is implicated in adult temporal lobe epilepsy.
• Limited research exists on DMN function in pediatric medically refractory epilepsy.

Purpose of the Study:

• To investigate differences in the DMN between children with medically refractory epilepsy and healthy controls.
• To assess DMN connectivity patterns in pediatric epilepsy.

Main Methods:

• Resting-state functional magnetic resonance imaging (fMRI) was conducted on 11 children with medically refractory epilepsy and 11 age-matched controls.
• Independent Component (IC) analysis identified the DMN, followed by random-effects analysis.
• Temporal correlation coefficients between key DMN regions (PCC/PCUN, mPFC, lateral parietal cortices) were calculated and correlated with clinical and cognitive parameters.

Main Results:

• Patients exhibited decreased DMN connectivity in the PCC/PCUN, bilateral lateral parietal cortex, and anterior/midcingulate regions compared to controls.
• Reduced connectivity was observed between specific DMN region pairs, including mPFC-right lateral parietal cortex and PCC/PCUN-left/right lateral parietal cortex.
• No significant correlations were found between DMN connectivity and clinical seizure parameters or IQ.

Conclusions:

• Children with medically refractory epilepsy demonstrate reduced DMN connectivity.
• Further research is warranted to explore seizure type effects on the DMN and its relationship with cognitive functions.