Brain Stimulation for Severe Treatment-Resistant Depression

Overseen By Rachel Johnson, PhD

Age: 18+

Sex: Any

Trial Phase: Academic

Sponsor: University of Minnesota

Disqualifiers: Suicidal, Schizophrenia, Dementia, Seizures, others

No Placebo Group All trial participants will receive the active study treatment (no placebo)

Compensation: Varies

Number of Visits: 21

15 Participants Needed

What You Need to Know Before You Apply

What is the purpose of this trial?

This trial aims to test whether stimulating the brain's surface can help treat severe depression unresponsive to other treatments. Participants will have a small device placed in their brain to send electrical signals, similar to a pacemaker for the brain. This method, known as Epidural Prefrontal Cortical Stimulation (EpCS), targets individuals who have struggled with depression for over two years and have not found relief from at least four different antidepressants.

As an unphased trial, this study provides a unique opportunity to explore a novel treatment approach for those who have not succeeded with existing options.

Will I have to stop taking my current medications?

The trial protocol does not specify whether you need to stop taking your current medications. It's best to discuss this with the study team and your healthcare provider.

What prior data suggests that this brain stimulation technique is safe for treating depression?

Research shows that prefrontal cortical stimulation (PCS) is under investigation as a potential treatment for severe depression. Studies on similar procedures have found that this type of brain stimulation can be safe for some patients. For instance, one study followed patients for five years and found that the treatment was generally well-tolerated.

The devices used in this study, such as the Proclaim Elite SCS System, have already received FDA approval for other conditions like chronic pain and Parkinson's disease. This approval suggests a certain level of safety, although using these devices for depression remains experimental.

Earlier research indicated that some patients experienced positive results with few serious side effects, although the number of participants was small. More research is needed to fully understand the treatment's safety for everyone. So far, the findings are promising but still in the early stages. ^{1 2 3 4 5}

Why are researchers excited about this trial?

Researchers are excited about Epidural Prefrontal Cortical Stimulation (EpCS) and Prefrontal Cortical Stimulation (PCS) for severe treatment-resistant depression because these approaches offer a novel way to target the brain. Unlike traditional antidepressants that primarily work on neurotransmitter levels, these treatments directly stimulate specific brain areas involved in mood regulation. This method could potentially provide relief for patients who haven't responded to existing medications or therapies, offering hope for faster and more effective outcomes. Additionally, the precise targeting of brain regions may reduce the risk of systemic side effects commonly seen with oral medications.

What evidence suggests that this brain stimulation technique is effective for severe treatment-resistant depression?

Research has shown that stimulating the front part of the brain, known as prefrontal cortical stimulation (PCS), might help people with severe depression unresponsive to other treatments. In this trial, participants will receive PCS, which uses electrical currents on the front of the brain, to assess its effectiveness in reducing depression symptoms. Studies have found that this method can provide lasting benefits, with some evidence suggesting these effects can endure for years after treatment. This technique resembles other successful treatments that stimulate the left side of the brain to ease depression. While more research is needed, early results offer hope for those who haven't found relief with other therapies. ^{2 3 4 6 7}

Who Is on the Research Team?

Ziad Nahas, MD

Principal Investigator

University of Minnesota

Are You a Good Fit for This Trial?

This trial is for adults with severe, treatment-resistant depression who have not responded to multiple antidepressant treatments and are under a psychiatrist's care. They must be able to consent, complete necessary evaluations, and have support within a 30-minute drive. Excluded are those with recent suicide attempts or high risk of suicide, active drug use, pregnancy, certain mental health conditions like schizophrenia or psychotic features in their depression.

Inclusion Criteria

Participant must be able to complete the evaluations needed for this study including the functional imaging scans and the EEG Bayesian optimization sessions

Participant must be able to provide written informed consent

I can provide contacts of two people over 22, living within 30 minutes from me, for the study.

Exclusion Criteria

I have a Deep Brain Stimulator implanted.

Participant with a positive urine pregnancy test

Participant is unable to undergo required full body magnetic resonance imaging (MRI) during the clinical study

Timeline for a Trial Participant

Baseline Assessments

Participants are screened for eligibility to participate in the trial

2 weeks

1 visit (in-person)

Surgery

Participants undergo surgery to implant the device and leads, with testing of the leads to explore optimal parameters

3 days

Hospitalization for a minimum of 3 days

Acute phase

Participants undergo follow-up visits for assessments and stimulator programming

19 weeks

10 follow-up visits

Follow-up

Participants are monitored for safety and effectiveness after treatment

7 months

7 monthly follow-up visits

Long Term Follow-up

Participants continue treatment with follow-up visits every three months

4 years

Quarterly visits alternating between in-person and virtual

What Are the Treatments Tested in This Trial?

Interventions

• Epidural Prefrontal Cortical Stimulation (EpCS)
• Prefrontal Cortical Stimulation (PCS)

Trial Overview

The study tests Prefrontal Cortical Stimulation (PCS) using the Proclaim Elite SCS System by Abbott Laboratories. This involves surgical placement of electrical leads on the brain surface behind the forehead to stimulate it intermittently. Although FDA-approved for other conditions like chronic pain and Parkinson's disease, its effectiveness for depression is still being investigated.

How Is the Trial Designed?

Group I: Prefrontal Cortical Stimulation (PCS) Experimental Treatment 1 Intervention

Stereotactically implanted bilateral PCS

Epidural Prefrontal Cortical Stimulation (EpCS) is already approved in United States for the following indications:

Approved in United States as Proclaim Elite SCS System / Eterna SCS System for:

• Chronic pain
• Muscular diseases (such as Parkinson's)

Who Is Running the Clinical Trial?

University of Minnesota

Lead Sponsor

Trials

1,459

Recruited

1,623,000+

Published Research Related to This Trial

Chronic electrical cortical stimulation (ECS) using a modified technique involving interdural electrode placement showed significant and sustained pain relief in 4 patients with treatment-refractory chronic pain, with follow-up periods ranging from 9 to over 24 months.

The new technique demonstrated stable impedance values post-surgery, suggesting improved efficacy and consistency of ECS without increasing procedural risks compared to traditional implantation methods.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Bifocal cortical electrical stimulation for pain by interdural implantation of the electrodes. Sakas, DE., Flaskas, TN., Panourias, IG., et al.[2011]

Cortical spreading depression (CSD) was used in unanesthetized curarized rats to study its effects on epileptic seizures induced by direct cortical stimulation, showing that CSD can be a reversible and repeatable method for such analysis.

Inducing CSD in the hemisphere opposite to the stimulated cortex reduced the duration of epileptic afterdischarges by 40% and altered their characteristics, suggesting that both cortical and subcortical structures play a significant role in the generation of these after-discharges.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Cortical afterdischarges during Leao's cortical spreading depression. Aquino-Cias, J., Aneiros-Riba, R., Hernandez-Mesa, N.[2013]

Implanted cortical stimulation, whether epidural or subdural, can provide long-term treatment benefits for neuropsychiatric diseases, especially when transcranial stimulation is ineffective.

While subdural stimulation allows for more precise targeting and lower current use, it carries a higher risk of complications such as seizures and infections compared to epidural stimulation.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Epidural and subdural stimulation. Tronnier, V., Rasche, D.[2013]

Chronic epidural stimulation (EpCS) of the left dorsolateral prefrontal cortex (DLPFC) showed significant improvement in patients with refractory major depressive disorder (MDD), particularly with mixed mode and continuous anodic stimulation, indicating its potential as an effective treatment option.

The study found that optimal electrode placement in the lateral and anterior regions of the DLPFC correlated with the greatest improvement in depression symptoms, suggesting that careful consideration of stimulation parameters is crucial for maximizing therapeutic outcomes.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

The role of electrode location and stimulation polarity in patient response to cortical stimulation for major depressive disorder. Pathak, Y., Kopell, BH., Szabo, A., et al.[2021]

Motor cortex stimulation (MCS) is a promising minimally invasive neurosurgical method for treating advanced Parkinson's disease (PD), showing significant improvements in motor symptoms, particularly axial symptoms and L-dopa-induced dyskinesia, across 13 out of 16 studies involving 130 patients.

MCS has a low risk of complications, especially when performed extradurally, making it a viable alternative to deep brain stimulation (DBS) for PD patients who are not candidates for DBS, with the ability to relieve major PD symptoms bilaterally.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Minimally invasive motor cortex stimulation for Parkinson's disease. Lavano, A., Guzzi, G., DE Rose, M., et al.[2022]

Electroconvulsive therapy (ECT) is a well-established and effective treatment for severe depression, but it has significant side effects and ongoing research is focused on optimizing its administration methods.

Emerging treatments like magnetic seizure therapy show promise with potentially similar efficacy to ECT but fewer side effects, while techniques like vagus nerve stimulation (VNS) and repetitive transcranial magnetic stimulation (rTMS) are already available and supported by research, though they require further study to determine optimal treatment parameters.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Non-pharmacological biological treatment approaches to difficult-to-treat depression. Fitzgerald, PB.[2020]

Epidural prefrontal cortical stimulation (EpCS) showed promising long-term efficacy for treatment-resistant depression (TRD) in a study of 5 adults, with 60% of participants remaining in remission after 5 years and significant improvements in depression scores over time.

The therapy was generally well-tolerated, although there were serious adverse events related to device malfunctions and infections, highlighting the need for careful monitoring in patients undergoing this treatment.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Five-Year Follow-Up of Bilateral Epidural Prefrontal Cortical Stimulation for Treatment-Resistant Depression. Williams, NR., Short, EB., Hopkins, T., et al.[2018]

Chronic and intermittent epidural prefrontal cortical stimulation (EpCS) was well-tolerated by all five patients with treatment-resistant depression, indicating a favorable safety profile for this new treatment approach.

At a 7-month follow-up, patients showed significant improvements in depression scores, with an average reduction of 54.9% on the Hamilton Rating Scale and 60.1% on the Inventory of Depressive Symptoms, and three patients achieved remission, suggesting promising efficacy for EpCS.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Bilateral epidural prefrontal cortical stimulation for treatment-resistant depression. Nahas, Z., Anderson, BS., Borckardt, J., et al.[2022]

Transcranial magnetic stimulation (TMS) is a safe and noninvasive treatment option for severe treatment-resistant psychiatric disorders, but its clinical application needs further clarification.

Magnetic seizure therapy, a refined version of TMS that induces seizures under anesthesia, has shown significant antidepressant effects with fewer cognitive side effects, while deep brain stimulation, an invasive method, shows promise for severe obsessive-compulsive disorders and depression, though ethical considerations are crucial.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

[Brain stimulation procedures. Transcranial magnetic stimulation, magnetic seizure therapy and deep brain stimulation]. Schläpfer, TE., Kayser, S.[2021]

Cortical stimulation techniques, including epidural cortical stimulation (ECS) and repetitive transcranial magnetic stimulation (rTMS), have been used to treat conditions like drug-resistant neuropathic pain and major depression, showing promising therapeutic effects.

These stimulation methods can influence brain networks far from the stimulation site, potentially activating or inhibiting various neural pathways, and may lead to long-lasting changes in brain function due to synaptic plasticity, highlighting their potential for neuroprotective effects.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Methods of therapeutic cortical stimulation. Lefaucheur, JP.[2017]

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