Changed brain entropy and functional connectivity patterns induced by electroconvulsive therapy in majoy depression...

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Major Depressive Disorder (MDD) is a complex psychiatric condition with unclear pathogenesis.
• Electroconvulsive Therapy (ECT) is an effective treatment for severe MDD, but its neural mechanisms require further elucidation.
• Current research often focuses on either linear or nonlinear brain signal characteristics, potentially missing integrated insights.

Purpose of the Study:

• To innovatively integrate linear and nonlinear brain signal characteristics in Electroconvulsive Therapy (ECT) research.
• To uncover deeper insights into the pathogenesis of Major Depressive Disorder (MDD).
• To identify novel targets for physical intervention therapies in MDD.

Main Methods:

• Measured brain entropy (BEN) using resting-state functional MRI (rs-fMRI) in 42 MDD patients and 42 healthy controls (HC).
• Identified brain regions with significant differences in MDD patients before and after ECT.
• Investigated whole-brain resting-state functional connectivity (RSFC) patterns using identified regions as seed points.

Main Results:

• MDD patients exhibited higher BEN in the right precuneus (PCUN.R) and right angular gyrus (ANG.R) compared to HCs.
• Post-ECT, patients showed reduced BEN in PCUN.R and ANG.R.
• Significant increases in RSFC were observed after ECT between PCUN.R and the right middle temporal gyrus, and between ANG.R and the right middle frontal gyrus/right supramarginal gyrus.

Conclusions:

• Integrating linear and nonlinear brain signal characteristics provides a comprehensive approach to understanding depression.
• This combined analysis effectively explores the pathogenesis of MDD.
• The findings offer new targets for optimizing ECT and developing novel physical intervention therapies.