Major Depressive Disorder Clinical Trial
Official title:
Neural Predictors and Longitudinal Neural Correlates of Clinical Improvement After Standard or Deep Transcranial Magnetic Stimulation in Major Depression: A Randomized Study
Standard high frequency repetitive transcranial magnetic stimulation (HF-TMS) is a noninvasive method to activate or de-activate neurons in superficial regions of the brain through the induction of weak electric currents in the brain tissue produced by rapidly changing magnetic fields. Studies have generally shown standard HF-TMS to be effective in treating major depressive disorder (MDD), although treatment effects are often highly variable and there are several negative trials in the specialized literature. One reason for these discrepant results might be that standard HF-TMS only enables direct stimulation of superficial brain areas and, consequently, it is possible that the stimulation of deeper and more widespread brain regions could produce superior and more reliable results. Recently, a novel form of HF-rTMS (called deep transcranial magnetic stimulation or DTMS), that allows direct stimulation of much larger and deeper brain regions, has also been shown to be effective and safe in treating MDD. Neuroimaging studies have shown that standard HF-rTMS directly affects several superficial areas of the brain, but to date there is no data on the brain effects of DTMS. Thus, this study aims to explore, for the first time, the brain effects of DTMS in MDD. More specifically, we, the investigators, hope to identify possible neural predictors of clinical improvement after DTMS and also clarify the impact of DTMS in the brain activity over time. In this study, DTMS will be applied over the left side of the front of the head (a region known as the 'prefrontal cortex'), and will be compared with standard HF-TMS in terms of its effectiveness and brain effects. For this, subjects with at least moderate MDD will be randomized to receive daily DTMS or standard HF-rTMS treatment for 4 weeks, and will undergo functional magnetic resonance imaging (fMRI) before and after treatment. fMRI is a neuroimaging technique that allows us to measure which areas of the brain are more or less 'active' in response to specific stimuli at a particular time. During the fMRI sessions, we will use a validated cognitive task on working memory. Our results could eventually lead us, among other things, to identify which depressed patients would be best candidates for receiving either standard HF-rTMS or DTMS, and which areas of the brain should be targeted by these neuromodulation techniques.
n/a
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Treatment
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