Transcranial Direct Current Stimulation in Major Depression
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|ClinicalTrials.gov Identifier: NCT03556124|
Recruitment Status : Completed
First Posted : June 14, 2018
Last Update Posted : July 31, 2020
Noninvasive transcranial direct current stimulation (tDCS) is a low-intensity neuromodulation technique of minimal risk that has been used as an experimental procedure for reducing depressive symptoms and symptoms of other brain disorders. Though tDCS applied to prefrontal brain areas is shown to reduce symptoms in some people with major depressive disorder (MDD), the extent of antidepressant response often differs. Methods that map current flow directly in the brain while a person is receiving tDCS and that determine how functional neuroimaging signal changes after a series of tDCS sessions may help us understand how tDCS works, how it can be optimized, and if it can be used as an effective intervention for reducing depressive symptoms. We will investigate these questions in a two-part randomized double blind exploratory clinical trial. The first part of the trial will compare how current flow and functional imaging signal differs in the brain when using tDCS with more focal stimulation, called high definition (HD) tDCS, compared to conventional tDCS (C-tDCS) or sham (non-active) tDCS in patients with MDD.
Sixty people with depression (20 in each group) will be randomized to receive either HD-tDCS, C-tDCS or sham-tDCS for a total of 12 sessions each lasting 20 minutes occurring on consecutive weekdays. At the first and last session, subjects will receive 20-30 minutes of active or sham tDCS in the MRI scanner, which will allow us to map tDCS currents, and track changes in regional cerebral blood flow (rCBF) pre-to- post treatment using completely non-invasive methods. At the first and last session and mid-way through the trial, participants will also complete a series of clinical ratings and neurocognitive tests
|Condition or disease||Intervention/treatment||Phase|
|Major Depressive Disorder||Device: Active - HD tDCS Device: Sham - HD tDCS Device: Active - Conventional tDCS Device: Sham - Conventional tDCS||Not Applicable|
Transcranial direct current stimulation (tDCS), a noninvasive neuromodulation technique, applied to the left dorsolateral prefrontal cortex (DLPFC) can reduce depressive symptoms and improve cognitive control in major depressive disorder (MDD). Such findings suggest modulation of top down prefrontal-limbic circuits, which are functionally distinct from ventro-limbic networks and include reciprocally connected DLPFC and dorsomedial anterior cingulate cortex (dACC). However, substantial variation in tDCS response is observed in MDD. This may be due to imprecise stimulation protocols and suboptimal engagement of the neural circuits mediating antidepressant response. Methods that optimize electrode placement and account for individual variation in anatomy and that map current flow directly in the brain may inform the mechanisms and potential clinical utility of tDCS. A new tDCS technique, high definition (HD) tDCS, offers more focal stimulation than conventional tDCS (C-tDCS). The degree to which C-tDCS or HD-tDCS engage dorsal prefrontal-limbic neural circuits is unknown, yet is vital for understanding, confirming and subsequently improving possible therapeutic effects. Innovative MRI techniques that are able to map tDCS currents in vivo and that track changes in regional cerebral blood flow occurring with tDCS over time can provide direct evidence of neural effects. Based on a) theoretical modeling of tDCS current flow, b) studies showing hypo-metabolism, decreased CBF or activity in dorsal prefrontal-limbic networks, c) modulation of these regions with treatment, and, c) our prior results showing significant relationships in between change in dACC rCBF and clinical response to electroconvulsive therapy (ECT), an established brain stimulation treatment, we will test for the tDCS engagement and modulation of the DLPFC and dACC using tDCS current mapping performed in vivo and perfusion MRI. MRI-guided neuronavigation will be used to optimize and standardize electrode placement for DLPFC stimulation.
In this trial we will test for the target engagement of the DLPFC and dACC by comparing C-tDCS, HD-tDCS and sham tDCS applied to the left DLPFC in patients with moderate to severe MDD before and after they complete 12 daily 20-minute sessions of C-tDCS, HD-tDCS or Sham tDCS (n=20 randomized to each group). In-vivo electric current mapping performed at different current intensities (0-2 mA) for 20-30 minutes, and change in regional cerebral blood flow (rCBF) measured before and after a 12-day tDCS trial will determine acute and longer-term modulation of DLPFC and dACC circuitry for each tDCS modality respectively.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||66 participants|
|Intervention Model:||Parallel Assignment|
|Intervention Model Description:||Active and Sham controlled|
|Masking:||Double (Participant, Outcomes Assessor)|
|Masking Description:||Double blind|
|Official Title:||Imaging-guided tDCS Therapy in Major Depression|
|Actual Study Start Date :||February 2, 2018|
|Actual Primary Completion Date :||May 31, 2020|
|Actual Study Completion Date :||May 31, 2020|
Experimental: Active - HD tDCS
Participants randomized to this arm will receive 12 sessions of high definition tDCS (HD-tDCS) stimulation (Soterix Medical) delivered to the left dorsolateral prefrontal cortex for 20-30 minutes.
Device: Active - HD tDCS
Non-invasive neuromodulation using HD electrodes placed on the scalp to deliver a constant, low current at 2 mA.
Experimental: Active - Conventional tDCS
Participants randomized to this arm will receive 12 sessions of conventional tDCS (C-tDCS) stimulation (Soterix Medical) delivered to the left dorsolateral prefrontal cortex for 20-30 minutes.
Device: Active - Conventional tDCS
Non-invasive neuromodulation using standard 7 cm x 5 cm electrodes placed on the scalp to deliver a constant, low current at 2 mA.
Sham Comparator: Sham - HD tDCS
Participants randomized to this arm will receive 12 sessions of sham HD tDCS stimulation (Soterix Medical) delivered to the left dorsolateral prefrontal cortex for 20-30 minutes.
Device: Sham - HD tDCS
Sham neuromodulation using HD electrodes placed on the scalp to deliver a low current ramped up/down for 20 sec.
Sham Comparator: Sham - Conventional tDCS
Participants randomized to this arm will receive 12 sessions of sham conventional tDCS stimulation (Soterix Medical) delivered to the left dorsolateral prefrontal cortex for 20-30 minutes.
Device: Sham - Conventional tDCS
Sham neuromodulation using standard 7 cm x 5 cm electrodes electrodes placed on the scalp to deliver a low current ramped up/down for 20 sec.
- Changes in non-invasive MRI measures of cerebral blood flow between baseline and end of treatment [ Time Frame: Up to 3 weeks ]Modulation of the left dorsolateral prefrontal cortex (DLPFC) and dorsal anterior cingulate cortex (dACC) measured by percent rCBF signal change
- Change in non-invasive MRI measures of current flow [ Time Frame: 1 hour ]tDCS-induced in vivo magnetic field changes in the left DLPFC as the current is being ramped up from 0 to 2 mA in increments of 0.5 mA over the course of a 1-hour MRI scan
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03556124
|United States, California|
|University of California, Los Angeles (UCLA)|
|Los Angeles, California, United States, 90095|
|Principal Investigator:||Katherine Narr, PhD||University of California, Los Angeles|