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Clinical Trial Summary

Repetitive transcranial magnetic stimulation (rTMS) is an emerging treatment for medically refractory major depressive disorder (MDD). rTMS involves direct stimulation of cortical neurons using externally applied, powerful, focused magnetic field pulses. Dozens of studies and several meta-analyses over the last 15 years have shown that rTMS of the dorsolateral prefrontal cortex (DLPFC) produces statistically significant improvements in MDD, even when medications have failed. However, other possible targets may also yield improvement in symptoms.

In an attempt to enhance the therapeutic efficacy of current interventions for TRD, attention has turned to identifying domain-specific biomarkers in hopes of ultimately individualizing and predicting treatment response. Unfortunately, the precise nature of this relationship is less than clear, as reflected by the fact that even now there are no established biomarkers that are used routinely in clinical practice to aid in diagnosis. This study also seeks to examine a comprehensive suite of biomarker measurements (MRI, neurophysiology, and genomics/proteomics) before and after rTMS treatment.


Clinical Trial Description

rTMS is a Health-Canada- and FDA-approved treatment for treatment-resistant depression (TRD), using focused magnetic field pulses to stimulate brain regions involved in emotion regulation, safely and non-invasively. Though rTMS is often effective where medications or therapy fail, it requires a series of lengthy (~30-40 min) treatment sessions. A new form of rTMS called theta burst stimulation (TBS) has been shown to have greater effects on neural activity than conventional stimulation, despite requiring as little as 40 s of stimulation. The purpose of this study is to assess the efficacy and tolerability of an accelerated TBS protocol, administered 2 times a day in patients with TRD. In addition, the investigators aim to identify candidate biomarkers from a multimodal suite of neuroimaging, neurophysiologic and molecular measures that are predictors and correlates of response to rTMS treatment. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT02729792
Study type Interventional
Source Centre for Addiction and Mental Health
Contact
Status Completed
Phase N/A
Start date March 2016
Completion date May 30, 2018

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