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MRI-guided dmPFC-rTMS as a Treatment for Treatment-resistant Major Depressive Disorder

MRI-guided dmPFC-rTMS as a Treatment for Treatment-resistant Major Depressive Disorder

Published on: August 11, 2015

Resting-state functional connectivity in treatment-resistant depression.

Su Lui¹, Qizhu Wu, Lihua Qiu

¹Huaxi MR Research Center, Department of Radiology, West China Hospital of Sichuan University, China.

The American Journal of Psychiatry

|March 3, 2011

Summary

Major depressive disorder shows distinct brain network differences. Refractory depression impacts thalamo-cortical circuits, while nonrefractory depression affects broader limbic-striatal-pallidal-thalamic networks.

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Individualized rTMS Treatment for Depression using an fMRI-Based Targeting Method

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Area of Science:

Neuroscience
Psychiatry
Radiology

Background:

Major depressive disorder (MDD) is a prevalent mood disorder.
Understanding the neural underpinnings of different MDD subtypes is crucial for targeted treatment.

Purpose of the Study:

To investigate differences in resting-state functional brain connectivity between patients with refractory MDD, nonrefractory MDD, and healthy controls.
To identify distinct patterns of brain network dysfunction associated with MDD severity and treatment resistance.

Main Methods:

Cross-sectional study involving 28 refractory MDD patients, 32 nonrefractory MDD patients, and 48 healthy controls.
Resting-state functional connectivity magnetic resonance imaging (fMRI) using a 3-T MR system.
Voxel-wise correlation analysis of 13 predefined mood regulation-related regions of interest.

Main Results:

Both MDD groups exhibited reduced bilateral prefrontal-limbic-thalamic connectivity compared to healthy controls.
Nonrefractory MDD showed more widespread connectivity decreases, particularly in the anterior cingulate cortex, amygdala, hippocampus, and insula.
Refractory MDD displayed disrupted connectivity primarily in bilateral prefrontal areas and the thalamus.

Conclusions:

Refractory depression is characterized by disrupted functional connectivity within thalamo-cortical circuits.
Nonrefractory depression is associated with more distributed decreased connectivity across the limbic-striatal-pallidal-thalamic circuit.
Distinct functional deficits in brain networks differentiate refractory from nonrefractory major depressive disorder.