Electroconvulsive Therapy Induces Cortical Morphological Alterations in Major Depressive Disorder Revealed with...

Area of Science:

• Neuroscience
• Psychiatry
• Medical Imaging

Background:

• Electroconvulsive therapy (ECT) is a highly effective treatment for major depressive disorder (MDD).
• The precise mechanisms behind ECT's therapeutic effects and side effects are not fully understood.
• Understanding brain structural changes associated with ECT is crucial for optimizing treatment.

Purpose of the Study:

• To investigate alterations in cortical morphology (thickness, surface area, gyrification) after ECT in MDD patients.
• To determine if these morphological changes can serve as indicators of ECT's therapeutic efficacy.
• To explore the relationship between morphological changes, symptom severity, and memory function.

Main Methods:

• Surface-based morphometry (SBM) was used to analyze cortical thickness (CT), surface area (SA), and local gyrification index (LGI) in 23 MDD patients.
• Measurements were taken before and after ECT treatment.
• Multivariate pattern analysis with linear support vector machine (SVM) was employed to assess classification accuracy.

Main Results:

• ECT led to significant increases in CT and SA in widespread brain regions, notably the left insula and left fusiform gyrus.
• Hypergyrification was observed in the left middle temporal gyrus (MTG) post-ECT.
• Morphological changes correlated with reduced depressive symptoms and improved memory scores; SVM effectively classified patients pre- and post-ECT.

Conclusions:

• ECT appears to enhance cortical neuroplasticity, potentially through neurogenesis, leading to symptom remission in MDD.
• ECT-induced morphological changes are associated with both therapeutic benefits and potential memory impairments.
• Cortical morphometry serves as a valuable index for evaluating the therapeutic efficacy of ECT.