Related Experiment Video
Updated: Jan 30, 2026
04:51
Pupillary Response as Assessment of Effective Seizure Induction by Electroconvulsive Therapy
Published on: April 11, 2019
10.4K
Variations in Hippocampal White Matter Diffusivity Differentiate Response to Electroconvulsive Therapy in Major
Antoni Kubicki1, Amber M Leaver1, Megha Vasavada1
1Ahmanson-Lovelace Brain Mapping Center, Department of Neurology, University of California, Los Angeles, Los Angeles, California.
Biological Psychiatry. Cognitive Neuroscience and Neuroimaging
|January 20, 2019
Summary
Electroconvulsive therapy (ECT) alters right hippocampal structural connectivity in major depression responders. These changes in axonal integrity correlate with mood improvement, suggesting neurotrophic mechanisms.
Area of Science:
- Neuroscience
- Psychiatry
- Radiology
Background:
- Electroconvulsive therapy (ECT) effectively treats severe depression.
- ECT modulates hippocampal volume and functional connectivity.
- The impact of ECT on hippocampal structural connectivity and its relation to clinical response remains unclear.
Purpose of the Study:
- To investigate changes in hippocampal structural connectivity following ECT.
- To determine if these changes correlate with clinical response in major depression patients.
Main Methods:
- Diffusion magnetic resonance imaging (dMRI) was used in 36 patients with major depression and 32 controls.
- Tractography analyzed hippocampal pathways, extracting volume and diffusion metrics.
- Statistical analyses examined ECT effects and time-by-response interactions.
Main Results:
- ECT significantly altered axial, radial, and mean diffusivity in right hippocampal pathways (p < .01).
- These ECT-related changes were observed only in treatment responders and correlated with mood improvement (p < .004).
- No significant changes were found in fractional anisotropy or volume, and control subjects showed stable measures.
Conclusions:
- ECT induces changes in the structural connectivity of hippocampal neural circuits.
- These alterations distinguish treatment responders and suggest neurotrophic, glial, or inflammatory mechanisms impacting axonal integrity.
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