Multimodal multi-center analysis of electroconvulsive therapy effects in depression: Brainwide gray matter increase...

Area of Science:

• Neuroimaging
• Neuroscience
• Psychiatry

Background:

• Electroconvulsive therapy (ECT) is a recognized treatment for severe depression.
• ECT is known to induce increases in gray matter (GM) volume.
• Previous studies on ECT's effects on brain function have yielded inconsistent findings.

Purpose of the Study:

• To investigate the impact of ECT on brain structure and function.
• To explore the relationship between structural and functional brain changes and clinical improvement.
• To utilize multicenter neuroimaging data from the Global ECT-MRI Research Collaboration (GEMRIC).

Main Methods:

• Analysis of structural and functional resting-state MRI data from 88 individuals with depressive episodes before and after ECT.
• Voxel-based morphometry for structural data and various functional measures including fractional amplitudes of low-frequency fluctuations, regional homogeneity, and degree centrality.
• Comparison of longitudinal effects in the ECT group with healthy controls (n=27).

Main Results:

• Widespread increases in GM volume were observed in patients post-ECT.
• No significant changes were detected in any functional brain measures.
• No significant differences in structural or functional changes were found between ECT responders and non-responders.

Conclusions:

• ECT leads to widespread increases in GM volume but does not appear to alter brain function or correlate with clinical response.
• Focal changes in brain function may be linked to individual variations in brain volume increases.
• The study highlights a dissociation between structural and functional changes following ECT.