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Updated: Aug 12, 2025
Individualized rTMS Treatment for Depression using an fMRI-Based Targeting Method
Published on: August 2, 2021
Functional connectivity changes between amygdala and prefrontal cortex after ECT are associated with improvement in
Ann-Kathrin Domke1, Moritz Hempel2, Corinna Hartling3
1Department of Psychiatry, Centre for Affective Neuroscience (CAN), Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt Universität zu Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203, Berlin, Germany. ann-kathrin.domke@charite.de.
Electroconvulsive therapy (ECT) improves treatment-resistant depression by altering brain connectivity. Increased functional connectivity in the limbic-prefrontal network after ECT is linked to reduced depressive symptoms, particularly sadness and negative thoughts.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Electroconvulsive therapy (ECT) is a highly effective treatment for severe, treatment-resistant depression.
- The precise neural mechanisms underlying ECT's therapeutic effects remain incompletely understood.
- Investigating depression-specific brain networks using resting-state functional MRI (rsFC) offers a novel approach to elucidate ECT's action.
Purpose of the Study:
- To explore the relationship between changes in resting-state functional connectivity (rsFC) and symptom improvement following ECT in patients with treatment-resistant depression.
- To identify baseline neural targets that may predict individual clinical responses to ECT.
- To analyze the direct association between rsFC changes and specific symptom dimensions.
Main Methods:
- A naturalistic study involving 21 patients with treatment-resistant depression undergoing ECT.
- Resting-state functional MRI (rsFC) scans were acquired before and after ECT.
- Analyses focused on changes in rsFC related to overall symptom reduction and specific symptom dimensions (sadness, negative thoughts, detachment, neurovegetative symptoms).
Main Results:
- An increase in rsFC between the left amygdala and left dorsolateral prefrontal cortex (DLPFC) post-ECT correlated with overall symptom reduction and improvements in sadness, negative thoughts, and detachment.
- High baseline rsFC between the left amygdala and the right frontal pole (FP) predicted successful treatment outcomes.
- No significant association was found between rsFC changes and neurovegetative symptom improvement.
Conclusions:
- Changes in functional connectivity within the limbic-prefrontal network are significantly associated with symptom improvement in depression after ECT, especially for affective and cognitive symptoms.
- Frontal-limbic connectivity patterns show potential as biomarkers for predicting ECT treatment response.
- Integrating functional imaging biomarkers with symptom-based approaches may enhance our understanding and prediction of ECT efficacy.
