Responsive Neurostimulation for Post-Traumatic Stress Disorder

Post-Traumatic Stress Disorder Clinical Trial

Official title:

Responsive Neurostimulation for Post-Traumatic Stress Disorder

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT04152993
• Other study ID #: UNS107673A
• Status: Recruiting
• Phase: Early Phase 1
• Start date: March 22, 2021
• Est. completion date: July 31, 2026

Study information

• Verified date: May 2024
• Source: VA Greater Los Angeles Healthcare System
• Contact: Sonja Hiller
• Phone: 3107947517
• Email: shiller[@]mednet.ucla.edu
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Post-traumatic stress disorder (PTSD) refractory to treatment is marked by failure of fear extinction and its biological substrate, amygdala reactivity to trauma reminders. Decades of research have clarified the neuronal mechanisms coordinating fear extinction and consolidation. Fear cells and extinction cells in the basolateral amygdala (BLA) alter their firing rate based on the nature of the stimulus and the influence from the medial prefrontal cortex (mPFC) and the ventral hippocampus (vHPC). Together, the BLA, mPFC, and the vHPC form an anxiety-processing network where the BLA links stimulus to emotion, the vHPC provides memory context, and the mPFC coordinates extinction or consolidation. Local field potential (LFP) recordings from the BLA have revealed specific signals that correspond to an enhanced fear state. Previous studies have shown that neuromodulation of the BLA can promote extinction in a rodent model and in a treatment-refractory PTSD patient. This action is likely carried by disrupting fear signals within the BLA; however, continuous neurostimulation may also disrupt normal function of the amygdala. The present application proposes to investigate the use of Responsive Neurostimulation (RNS, Neuropace) in six (6) veterans suffering from severe treatment-resistant PTSD. This dual-activity device will allow us to chronically record LFPs from the BLA under specific conditions such as fear conditioning, exposure to trauma reminders, and emotional memory encoding and retrieval. In addition, the neural activity will be captured during real-life symptoms of flashback and nightmares. These recordings will provide the specific electrophysiological biomarkers of hypervigilance and re-experiencing. The device will then be programmed to detect and treat these biomarkers with a pre-determined electrical pulse. The patients will be followed prospectively using psychological scales but also with functional neuroimaging and electroencephalograms. These modalities will be used to determine the extent of circuit engagement as a result of the therapy. By approaching PTSD from a fear processing mechanism perspective, our project will serve as a proof of concept for other circuit-based therapies in psychiatry. This proposal is a multi-departmental effort involving 11 investigators across 7 departments and requires a close collaboration between clinical and basic scientists. As a result, the findings underlying chronic recordings will bridge the basic science results from fear conditioning research to clinical neural processes in PTSD patients.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 6
• Est. completion date: July 31, 2026
• Est. primary completion date: July 31, 2026
• Accepts healthy volunteers: No
• Gender: Male
• Age group: 25 Years to 60 Years

Eligibility

Inclusion Criteria:

1. Male aged 25-60 years.

2. Able to give informed consent in accordance with institutional policies and participate in the 4-year follow-up, involving assessments and stimulator adjustments.

3. Patients must be stable on their current psychotropic medication for a period of 2 months before implantation and agree to not increase dosages or add any new medications for the first 6 months of the study, unless medically necessary.

4. Chart diagnosis of chronic and treatment-refractory PTSD as the principal psychiatric diagnosis and cause of distress and social/occupational impairment.

5. Confirmation of PTSD as the primary psychiatric diagnosis by the study psychiatrist via clinical interview and CAPS.

6. Minimum 5-year total illness duration, with no 6-month period of clinical remission during the 2 years prior to entry in the study.

7. Stage 2 level of treatment resistance as per Sippel et al.136: Clinical record documented failure to respond to adequate (minimum 3 month, with adherence) trials of at least 3 of the following evidence-based treatments including at least one pharmacologic agent below, and at least one trauma-focused individual cognitive-behavior psychotherapy among the following: Pharmacologic: sertraline, paroxetine, fluoxetine or venlafaxine, at maximally tolerated FDA recommended doses. Psychotherapy: Prolonged Exposure Therapy (PE); Cognitive Processing Therapy (CPT); Eye movement Desensitization and Reprocessing (EMDR); or other form of evidence-based cognitive behavior therapy for PTSD

8. Patients who are unable to complete trauma-focused psychotherapy may be included if they began treatment, and the cause of treatment cessation was that the risks of further treatment, including intense psychological suffering, outweighed the potential benefits of continuing the treatment.

9. All evidence-based psychotherapy for PTSD has been completed a minimum of 3 months prior to enrolment.

10. Minimum baseline past month CAPS-5 Score of 47, with full PTSD diagnostic criteria met, and scores of = 3 on at least one item from the intrusive (CAPS-5 items 1-5) and hyperarousal (CAPS-5 Items 15-20) clusters; and this severity maintained for at least one month during the baseline period based on two separate measures.

11. Clinically significant impairment in occupational functioning due to PTSD, manifested by one or more of the following: a) Total federal (service connected = 70%), or State (SSI) disability compensation for at least the past 2 years for PTSD; b) global assessment of functioning score = 45; c) no period of full time gainful employment = 3 months in the past 5 years. Or clinically significant impairment in social functioning due to PTSD, manifested by one or more of the following: (i) little or no social activity outside the household other than as necessary for medical appointments, practical matters such as grocery shopping, or to interact with other veterans; (ii) reliable description by a spouse or significant other, living with the patient, of repeated avoidance/refusal to participate in customary social engagements with friends, family or for recreational activities due to PTSD; (iii) two or more verbal or physical interpersonal altercations within the past year requiring another person's intervention to prevent further escalation, or involving law enforcement.

12. Presence in the veteran's life of a spouse, family member or friend who can confirm the symptoms and impairment from PTSD and lack of symptomatic remission in the past 2 years; participate with the study psychiatrist in answering questions about symptoms and functioning at scheduled follow-up visits; and report unexpected adverse neurological or psychiatric events to study investigators and, if advised by study investigators, assist the patient in accessing necessary services to address obtain care.

13. Willingness to have unexpected neurological or psychiatric symptom shared with the study psychiatrists and other study clinicians.

14. Other medical conditions must be stable for at least 1 year, (conditions that require intermittent use of steroids or chemotherapy are excluded).

Exclusion Criteria:

1. Suicide attempt in the last 2 years and/or presence of a suicide plan (an answer of "Yes" to Question C4 in Section C-Suicidality of MINI International Neuropsychiatric Interview);

2. Unstable psychosis or bipolar disorder; significant acute or ongoing risk for violence;

3. Patients primarily diagnosed with DSM-IV-TR Axis I disorder other than PTSD as determined by the MINI;

4. Within the 3 months prior to enrolment, subject has started a new psychotherapy program;

5. Alcohol or illicit substance use disorder within the last 6 months, unstable remission of substance abuse, or chart evidence that co-morbid substance use disorder could account for lack of treatment response;

6. Current significant neurological conditions, including epilepsy, stroke, movement disorder; history of serious head injury with loss of consciousness if associated with neurological or neuropsychological deficit that could interfere with study participation or outcome assessment; or if associated with structural MRI abnormality.

7. Uncontrolled medical condition including cardiovascular problems and diabetes;

8. Uncontrolled chronic pain;

9. Baseline Montgomery Asberg Depression Rating Scale (MADRS) of = 28;

10. Use of warfarin;

11. Significant abnormality on preoperative structural brain MRI;

12. ECT in the past 6 months;

13. Contraindications to MRIs or the need for recurrent body MRIs;

14. Immunosuppression;

15. High risk for surgery;

16. Current pursuit of new or increased disability compensation for PTSD;

17. Intracranial implants (aneurysm clip, shunt, cochlear implant, electrodes);

18. Patient has had past cranial neurosurgery;

19. Use of other investigational drugs within 30 days of baseline.

20. Patients suffering from a neurovascular condition or other intracranial process.

21. Patients suffering from a condition associated with a significant cognitive impairment.

Related Conditions & MeSH terms

• Post-Traumatic Stress Disorder
• Stress Disorders, Post-Traumatic
• Stress Disorders, Traumatic

Intervention

Device:
• NeuroPace® RNS® System
In this intervention, patients suffering from PTSD undergo a surgical procedure to implant the responsive neurostimulation device (RNS, NeuroPace). This procedure involves the placement of a depth lead bilaterally in the amygdala and hippocampus following a trans-occipital trajectory. The two leads are then connected to a pulse generator fixated to the skull. RNS is able to detect specific signals from the target and to respond with a programmed electrical stimulation. One month after the implantation of the system, the patients will undergo 3 tasks: a fear conditioning task, the international affective picture system and the subsequent memory recall paradigm. These tasks will yield electrophysiological biomarkers of arousal and re-experiencing. We will then program RNS to detect and respond to those biomarkers. The patients will be followed longitudinally for improvement and evidence of target engagement as seen on cerebral metabolism and global electroencephalography.

Locations

Country	Name	City	State
United States	VA Greater Los Angeles	Los Angeles	California

Sponsors (2)

Lead Sponsor	Collaborator
VA Greater Los Angeles Healthcare System	University of California, Los Angeles

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Spectral power analysis and oscillatory properties	This is associated with Specific Aim 1: To determine electrophysiological biomarkers of fear, extinction and PTSD symptoms. The metric for measurement will be Better Oscillation Detection (BOSC)	Baseline
Primary	Spectral power analysis and oscillatory properties	This is associated with Specific Aim 1: To determine electrophysiological biomarkers of fear, extinction and PTSD symptoms. The metric for measurement will be Better Oscillation Detection (BOSC)	through study completion, an average of 1 year
Primary	Cross-frequency coupling and power coherence comodulograms	This is associated with Specific Aim 1: To determine electrophysiological biomarkers of fear, extinction and PTSD symptoms. The metric for measurement will be modulation index.	Baseline
Primary	Cross-frequency coupling and power coherence comodulograms	This is associated with Specific Aim 1: To determine electrophysiological biomarkers of fear, extinction and PTSD symptoms. The metric for measurement will be modulation index.	through study completion, an average of 1 year
Primary	Region of Interest analysis (FDG PET)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be Cerebral metabolic rate of glucose (CMRglc)	Baseline
Primary	Region of Interest analysis (FDG PET)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be Cerebral metabolic rate of glucose (CMRglc)	After initial exposure session
Primary	Region of Interest analysis (FDG PET)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be Cerebral metabolic rate of glucose (CMRglc)	12 months post-operatively
Primary	Alpha rhythm frequency (EEG)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be frequency (Hertz)	Baseline
Primary	Alpha rhythm frequency (EEG)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be frequency (Hertz)	monthly after implantation for the first year
Primary	Alpha rhythm frequency (EEG)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be frequency (Hertz)	quarterly during year 2-4
Primary	Source localization (EEG)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be discrete dipole fitting.	Baseline
Primary	Source localization (EEG)	This is associated with Specific Aim 2: To determine engagement of fear processing neural networks by neurostimulation. The metric for measurement will be discrete dipole fitting.	through study completion, an average of 1 year
Secondary	Clinician Administered PTSD Scale	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score.	Baseline
Secondary	Clinician Administered PTSD Scale	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score.	monthly after implantation for the first year
Secondary	Occurrence of adverse events	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by frequency/severity.	through study completion, an average of 1 year
Secondary	Psychological scales (HAMA)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Psychological scales (HAMA)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	monthly after implantation for the first year
Secondary	Psychological scales (HAMA)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	every three months up to 48 months after baseline
Secondary	Psychological scales (MADRS)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Psychological scales (MADRS)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	monthly after implantation for the first year
Secondary	Psychological scales (MADRS)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	every three months up to 48 months after baseline
Secondary	Psychological scales (YBOC)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Psychological scales (YBOC)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	monthly after implantation for the first year
Secondary	Psychological scales (YBOC)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	every three months up to 48 months after baseline
Secondary	Digit Span subtest	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Digit Span subtest	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Trail Making Test A and B	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Trail Making Test A and B	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Ruff Figural Fluency Test (RFFT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Ruff Figural Fluency Test (RFFT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Brief Visual Memory Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Brief Visual Memory Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Revised (BVMT-R)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Revised (BVMT-R)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	California Verbal Learning Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	California Verbal Learning Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Attention, Processing Speed and Memory: Wechsler Adult Intelligence Scale IV (WAIS-IV)143 - Digit Span subtest, Trail Making Test A and B, Ruff Figural Fluency Test (RFFT), Brief Visual Memory Test - Revised (BVMT-R), California Verbal Learning Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Attention, Processing Speed and Memory: Wechsler Adult Intelligence Scale IV (WAIS-IV)143 - Digit Span subtest, Trail Making Test A and B, Ruff Figural Fluency Test (RFFT), Brief Visual Memory Test - Revised (BVMT-R), California Verbal Learning Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Wechsler Adult Intelligence Scale IV (WAIS-IV)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Wechsler Adult Intelligence Scale IV (WAIS-IV)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Wechsler Test of Adult Reading	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Wechsler Test of Adult Reading	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Controlled Oral Word Association (COWAT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Controlled Oral Word Association (COWAT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Hooper Visual Organization Test (VOT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Hooper Visual Organization Test (VOT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Rey-Osterrieth Complex Figure Test (CFT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Rey-Osterrieth Complex Figure Test (CFT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Wisconsin Card Sorting Test (WCST)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Wisconsin Card Sorting Test (WCST)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Stroop Color and Word Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Stroop Color and Word Test	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Iowa Gambling Task (IGT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Iowa Gambling Task (IGT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Montreal Cognitive Assessment (MOCA)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	Montreal Cognitive Assessment (MOCA)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Frontal Systems/ Executive Functions: Wisconsin Card Sorting Test (WCST), Stroop Color and Word Test, Iowa Gambling Task (IGT)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Rey-15 Recognition test of Mental Effort	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Months 6, 12, 24 and 48
Secondary	Rey-15 Recognition test of Mental Effort	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	SF-36V (quality of life)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	Baseline
Secondary	SF-36V (quality of life)	This is associated with Specific Aim 3: To assess the efficacy and safety of BLA stimulation for treatment-resistant PTSD. This test will be measured by the score	through study completion, an average of 1 year