Bilateral ECT induces bilateral increases in regional cortical thickness.

Area of Science:

• Neuroscience
• Psychiatry
• Radiology

Background:

• Major depressive disorder (MDD) is a severe condition, and its treatment-resistant forms often require Electroconvulsive therapy (ECT).
• The neurobiological mechanisms underlying ECT's effectiveness, particularly its impact on brain structure, remain largely unknown.
• While ECT is known to affect neuroplasticity, its specific effects on cortical thickness have not been previously investigated.

Purpose of the Study:

• To investigate the impact of Electroconvulsive therapy (ECT) on cortical thickness in patients with treatment-resistant major depressive disorder (MDD).
• To compare changes in cortical thickness in MDD patients undergoing ECT with healthy controls.

Main Methods:

• Acquired structural magnetic resonance imaging (sMRI) data from 19 patients with treatment-resistant MDD before and after a course of bilateral ECT.
• Collected sMRI data from 16 healthy controls at two time points for comparison.
• Analyzed and compared changes in cortical thickness between the MDD patient group and the control group.

Main Results:

• Electroconvulsive therapy (ECT) induced significant, bilateral increases in cortical thickness in MDD patients.
• Affected regions included the temporal pole, inferior and middle temporal cortex, and the insula.
• Increased cortical thickness was most prominent in brain regions associated with seizure onset during ECT, and insular cortex changes correlated with treatment response.

Conclusions:

• Electroconvulsive therapy (ECT) demonstrably alters cortical thickness, suggesting structural neuroplastic changes in the brain.
• The observed increases in cortical thickness, especially in the insula, may be linked to the therapeutic effects of ECT in major depressive disorder (MDD).
• Further research into these structural changes could elucidate ECT's neurobiological underpinnings and optimize treatment strategies.