iTBS + D-Cycloserine for Suicidal Thoughts

Overseen By Alexander McGirr, MD PhD

Age: 18 - 65

Sex: Any

Trial Phase: Phase 2

Sponsor: University of Calgary

Must be taking: D-Cycloserine

Must not be taking: GABA agonists

Disqualifiers: Psychosis, Pregnancy, Neurological disorders, others

Stay on Your Current Meds You can continue your current medications while participating

Prior Safety Data This treatment has passed at least one previous human trial

Approved in 2 Jurisdictions This treatment is already approved in other countries

Compensation: Varies

Number of Visits: 23

Duration: 2 weeks

54 Participants Needed

Trial Summary

Will I have to stop taking my current medications?

The trial requires that you stop taking certain medications, specifically GABA agonists like benzodiazepines, gabapentin, or anticonvulsants, as they might affect the treatment's effectiveness.

What data supports the effectiveness of the treatment iTBS+D-Cycloserine for reducing suicidal thoughts?

Research shows that intermittent theta burst stimulation (iTBS) can reduce suicidal thoughts in people with major depressive disorder (MDD). Studies have found that iTBS is safe and can decrease suicide risk, even in patients who do not respond to other depression treatments. ^{1 2 3 4 5}

Is iTBS with D-Cycloserine safe for humans?

Research shows that intermittent theta burst stimulation (iTBS) is generally safe and well-tolerated in humans, with no significant adverse events reported in studies involving patients with depression and bipolar disorder. ^{1 2 3 5 6}

How is the iTBS + D-Cycloserine treatment different from other treatments for suicidal thoughts?

The iTBS + D-Cycloserine treatment is unique because it combines brain stimulation (iTBS) with a medication (D-Cycloserine) to potentially reduce suicidal thoughts. iTBS is a non-invasive brain stimulation technique that has shown promise in reducing suicidal ideation in people with depression, while D-Cycloserine is a medication that may enhance the effects of brain stimulation. ^{1 2 3 5 7}

What is the purpose of this trial?

Background and Rationale: Suicide is the second leading cause of death in Canadian Emerging Adults (EAs; 18-24yrs). Current treatments for suicidal thoughts and behaviors are limited and novel treatments are required to save lives. Transcranial Magnetic Stimulation (TMS) is a non-invasive neurostimulation treatment for major depressive disorder, a mental health condition at high risk for suicide. It is well tolerated and effective. However, in the child and youth population, it does not appear to be superior to sham-TMS. Therefore, strategies for enhancing TMS outcomes are required. Over time, TMS can change the function of brain regions important in depression to reduce the symptoms of depression, including suicidal ideation. The investigators believe this occurs through a process called 'synaptic plasticity', or the process by which neurons change their connectivity with other neurons in an activity-dependent manner. Using an adjunct to facilitate these changes in the EA population may improve TMS outcomes, including both implicit and explicit measures of suicide risk. The investigators\' previous data indicates that, in adults, the effects of a TMS protocol called intermittent theta-burst stimulation (iTBS) can be enhanced by pairing stimulation with a medication called D-Cycloserine. This FDA-approved medication leads to enhanced synaptic plasticity with iTBS. In adults, this combination led to greater improvements in depression symptoms and both implicit and explicit suicide risk. Implicit suicide risk is measured with a computerized test, called the death/suicide implicit association test (Death/Suicide IAT), and explicit suicide risk is defined as suicidal thoughts reported by the individual. In the current study, we aim to determine whether the effects of iTBS can be augmented with D-Cycloserine to reduce suicide risk in the EA population. Typical courses of iTBS involve daily treatments over 6 weeks, a timeframe that is not acceptable in individuals experiencing suicidal ideation. For this reason, we will build on data indicating that treatment courses can be condensed by delivering multiple treatments in a single day to accelerate symptomatic improvements. Specifically, our data suggests that (1) 4-weeks of daily iTBS+D-Cycloserine significantly improves implicit and explicit suicide risk and (2) a single-dose of D-Cycloserine paired with two iTBS treatments separated by one hour, enhances the physiological effects of iTBS. As such, in this study, participants will receive two treatments per day, separated by an hour, thereby accelerating a typical 4-week course to 2 weeks. Research Question and Objectives: To conduct a 2-week double-blind placebo-controlled randomized clinical trial where 54 participants will be randomly assigned to one of two groups: 1) accelerated iTBS+D-Cycloserine, and 2) accelerated iTBS+placebo. The primary outcome of the study is performance on the Death/Suicide-IAT, a measure of suicide risk; however, we will also determine whether pairing stimulation with D-Cycloserine enhances the antidepressant effects of iTBS, reduces suicidal ideation in this population, and reduces the likelihood of engaging in suicidal behavior or having suicidal crises over the following six months.

Research Team

Alexander McGirr, MD

Principal Investigator

University of Calgary

Eligibility Criteria

This trial is for young adults aged 18-24 with moderate depression and suicidal thoughts or a history of suicide attempts. They must be able to consent, pass safety screenings including an ECG and blood tests, and commit to the treatment schedule. Hospitalized individuals with active suicidal plans can also join.

Inclusion Criteria

Have previously attempted suicide as defined by the Columbia Suicide Severity Rating Scale

Are able to adhere to the treatment schedule

Pass the TMS adult safety screening (TASS) questionnaire

Exclusion Criteria

Have concomitant major unstable medical illness, cardiac pacemaker or implanted medication pump

Have an intracranial implant (e.g., aneurysm clips, shunts, stimulators, cochlear implants, or electrodes) or any other metal object within or near the head, excluding the mouth, that cannot be safely removed because these can heat or move due to the rapidly alternating magnetic field generated by rTMS

Those with a history of intracranial implants or metal, or with any potential metal fragments in the body (particularly in the orbits)

Timeline

Screening

Participants are screened for eligibility to participate in the trial

1-2 weeks

1 visit (in-person)

Treatment

Participants receive accelerated iTBS+D-Cycloserine or iTBS+placebo treatments, with two sessions per day over 2 weeks

2 weeks

20 sessions (in-person)

Follow-up

Participants are monitored for safety and effectiveness after treatment, with assessments at 1-month and 6-months post-treatment

6 months

2 visits (in-person)

Treatment Details

Interventions

• iTBS+D-Cycloserine

Trial Overview The study is testing whether D-Cycloserine medication enhances the effects of iTBS (a type of brain stimulation therapy) in reducing depressive symptoms and suicidal thoughts over two weeks. Participants will either receive iTBS+D-Cycloserine or iTBS+placebo randomly.

Participant Groups

Group I: D-Cycloserine Experimental Treatment 2 Interventions

Participants will orally ingest a standard 100mg dose of D-Cycloserine daily (Monday-Friday) during 2 weeks of accelerated rTMS treatments (20 sessions; 2 sessions/day separated by 1 hour). D-Cycloserine will be ingested 60-120 minutes prior to the first rTMS treatment of the day.

Group II: Placebo Placebo Group 2 Interventions

Participants will orally ingest a standard 100mg dose of a microcrystalline placebo capsule daily (Monday-Friday) during 2 weeks of accelerated rTMS treatments (20 sessions; 2 sessions/day separated by 1 hour). The Placebo will be ingested 60-120 minutes prior to the first rTMS treatment of the day.

iTBS+D-Cycloserine is already approved in United States, Canada for the following indications:

Approved in United States as D-Cycloserine for:

• Tuberculosis

Approved in United States as Seromycin for:

• Tuberculosis

Approved in Canada as D-Cycloserine for:

• Tuberculosis

Who Is Running the Clinical Trial?

University of Calgary

Lead Sponsor

Trials

827

Recruited

902,000+

University of Alberta

Collaborator

Trials

957

Recruited

437,000+

Findings from Research

In a study involving 81 participants with major depressive disorder, accelerated intermittent theta burst stimulation (iTBS) significantly reduced suicidality and depressive symptoms over a 6-week period, indicating its potential as an effective treatment.

The intervention was found to be safe, with no serious adverse events reported, and showed particularly pronounced anti-suicidal effects in individuals with higher risk profiles.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Suicidality and relief of depressive symptoms with intermittent theta burst stimulation in a sham-controlled randomized clinical trial. Wilkening, J., Witteler, F., Goya-Maldonado, R.[2023]

Accelerated intermittent theta burst stimulation (TBS) was found to be safe and well tolerated in 12 suicidal therapy-resistant depressed patients, showing a significant decrease in suicidal ideation over time.

However, the reduction in suicidal thoughts was not definitively linked to the active TBS treatment compared to sham stimulation, indicating that further research is needed to confirm its efficacy.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

The acute effects of accelerated repetitive Transcranial Magnetic Stimulation on suicide risk in unipolar depression: preliminary results. Desmyter, S., Duprat, R., Baeken, C., et al.[2022]

Accelerated intermittent Theta Burst Stimulation (iTBS) was found to be safe and well tolerated in a study of 50 treatment-resistant depressed patients, with no worsening of suicidal ideation observed during the treatment.

The study showed a significant decrease in suicide risk, as measured by the Beck Scale of Suicide Ideation, lasting up to one month after treatment, regardless of whether patients received active or sham stimulation.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Accelerated Intermittent Theta Burst Stimulation for Suicide Risk in Therapy-Resistant Depressed Patients: A Randomized, Sham-Controlled Trial. Desmyter, S., Duprat, R., Baeken, C., et al.[2020]

In a study involving 45 patients with major depressive disorder, both active and placebo intermittent theta burst stimulation (aiTBS) led to rapid decreases in suicidal thoughts, indicating a potential for quick intervention.

The reduction in suicidal ideation after placebo aiTBS was linked to significant decreases in brain perfusion in the frontopolar prefrontal cortex, suggesting that even placebo treatments can influence brain activity related to cognitive processes and suicidal thoughts.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Placebo aiTBS attenuates suicidal ideation and frontopolar cortical perfusion in major depression. Baeken, C., Wu, GR., van Heeringen, K.[2020]

Intermittent theta burst stimulation (iTBS) applied to the left dorsolateral prefrontal cortex significantly reduced suicidal ideation and depressive symptoms in adolescents with major depressive disorder over a 2-week treatment period involving 10 sessions.

The study involved 45 participants, and those with higher initial depression and suicidal ideation scores experienced greater improvements, suggesting that iTBS is particularly effective for more severely affected individuals.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Effect of intermittent theta burst stimulation on suicidal ideation and depressive symptoms in adolescent depression with suicide attempt: A randomized sham-controlled study. Zhao, Y., He, Z., Luo, W., et al.[2023]

In a study of 26 patients with bipolar depression, active intermittent theta burst stimulation (iTBS) showed a high response rate of 72% and a remission rate of 42%, indicating its potential efficacy in treating this condition.

No adverse events were reported, demonstrating that iTBS is safe and well-tolerated, but further research with larger sample sizes is needed to confirm its superiority over sham treatment.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Twice-daily neuronavigated intermittent theta burst stimulation for bipolar depression: A Randomized Sham-Controlled Pilot Study. Bulteau, S., Beynel, L., Marendaz, C., et al.[2020]

In a study of 71 participants with Major Depressive Disorder who had limited response to high-frequency left-sided stimulation, subthreshold intensity intermittent theta-burst stimulation priming (iTBS-P) led to a greater reduction in depressive symptoms compared to suprathreshold intensity stimulation.

The results suggest that iTBS-P may work through homeostatic plasticity mechanisms, indicating that lower intensity stimulation could be more effective for clinical improvement in depression.

NCBI (Pubmed)

pubmed.ncbi.nlm.nih.gov

Subthreshold stimulation intensity is associated with greater clinical efficacy of intermittent theta-burst stimulation priming for Major Depressive Disorder. Lee, JC., Corlier, J., Wilson, AC., et al.[2021]

References

1. United States pubmed.ncbi.nlm.nih.gov

Suicidality and relief of depressive symptoms with intermittent theta burst stimulation in a sham-controlled randomized clinical trial. [2023]

2. Croatia pubmed.ncbi.nlm.nih.gov

The acute effects of accelerated repetitive Transcranial Magnetic Stimulation on suicide risk in unipolar depression: preliminary results. [2022]

3. Switzerland pubmed.ncbi.nlm.nih.gov

Accelerated Intermittent Theta Burst Stimulation for Suicide Risk in Therapy-Resistant Depressed Patients: A Randomized, Sham-Controlled Trial. [2020]

4. United States pubmed.ncbi.nlm.nih.gov

Placebo aiTBS attenuates suicidal ideation and frontopolar cortical perfusion in major depression. [2020]

5. Netherlands pubmed.ncbi.nlm.nih.gov

Effect of intermittent theta burst stimulation on suicidal ideation and depressive symptoms in adolescent depression with suicide attempt: A randomized sham-controlled study. [2023]

6. France pubmed.ncbi.nlm.nih.gov

Twice-daily neuronavigated intermittent theta burst stimulation for bipolar depression: A Randomized Sham-Controlled Pilot Study. [2020]

7. United States pubmed.ncbi.nlm.nih.gov

Subthreshold stimulation intensity is associated with greater clinical efficacy of intermittent theta-burst stimulation priming for Major Depressive Disorder. [2021]