Feasibility Study of ExAblate Thalamotomy for Treatment of Chronic Trigeminal Neuropathic Pain

September 8, 2023 updated by: InSightec

A Feasibility Study of Focused Ultrasound to Perform Bilateral Medial Thalamotomy for the Treatment of Chronic Trigeminal Neuropathic Pain

The goal of this prospective, randomized, sham-controlled, crossover study is to evaluate the safety and feasibility of ExAblate Neuro treatment of chronic trigeminal neuropathic pain.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This study is to show that for patients with treatment-refractory chronic trigeminal neuropathic pain, ExAblate Neuro focused ultrasound (FUS) can safely create lesions bilaterally in the thalamic nuclei to reduce pain and provide functional benefits in daily activities. After informed consent and screening, eligible subjects will be randomized to either an ExAblate treatment or a Sham Control procedure. Subjects who are randomized to Sham Control will undergo the same procedure and follow-up visits through their Month 3 visit. After the Month 3 assessments are complete, all subjects will be un-blinded and those in the Sham treated group will have the option for an actual ExAblate treatment in an un-blinded fashion, as long as they still qualify for ExAblate treatment.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
10

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Virginia
      • Charlottesville, Virginia, United States, 22908
        • University of Virginia

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

14 years to 71 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Men and women, between 18 and 75 years, inclusive
  • Subjects who are able and willing to give consent and able to attend all study visits
  • Severe chronic, trigeminal neuropathic pain of ≥6 months duration.
  • Pain is medication-refractory to adequate trials of at least 3 prescription medications commonly used for symptomatic relief of neuropathic pain with current adjunctive use of at least one medication. An adequate medication trial is defined as a therapeutic dose of each medication without sufficient effect.
  • Pain is treatment-resistant to at least one interventional therapies including injections, procedures, neuromodulation, and surgery.
  • Able to communicate sensations during the focused ultrasound treatment
  • Stable prescribed doses of all symptomatic pain medications for 30 days prior to study entry and for the duration of the 3-month blinded phase of the study.

Exclusion Criteria:

  • Craniofacial pain syndromes related to malignancy of the head and neck
  • Idiopathic trigeminal neuralgia
  • Headache syndromes like migraine, cluster headache
  • Temporomandibular joint syndrome
  • Atypical facial pain or pain related to a somatoform disorder

  • Subjects with active psychiatric illness will be excluded. For the purpose of this study, active psychiatric illness includes:

    • Exhibiting current suicide ideation and/or a history of suicide attempt within past 2 years
    • been hospitalized for the treatment of a psychiatric illness within the past 2 years
    • received transcranial magnetic stimulation for depression treatment
    • received electroconvulsive therapy for depression
  • Any presence or history of psychosis will be excluded.

  • Subjects with unstable cardiac status including:

    • Unstable angina pectoris on medication
    • Subjects with documented myocardial infarction within six months of protocol entry
    • Significant congestive heart failure defined with ejection fraction < 40
    • Subjects with unstable ventricular arrhythmias
    • Subjects with atrial arrhythmias that are not rate-controlled
  • Severe hypertension (diastolic BP > 100 on medication)
  • Subjects with standard contraindications for MR imaging such as non-MRI compatible implanted metallic devices including cardiac pacemakers, size limitations, etc.
  • Receiving anticoagulant (e.g. warfarin) or antiplatelet (e.g. aspirin) therapy within one week of focused ultrasound procedure or drugs known to increase risk or hemorrhage (e.g. Avastin) within one month of focused ultrasound procedure
  • Individuals who are not able or willing to tolerate the required prolonged stationary supine position during treatment (can be up to 4 hours of total table time.)
  • Subjects participating or have participated in another clinical trial in the last 30 days
  • Presence of systemic neurological disease or dysfunction
  • Known life-threatening systemic disease
  • Subjects with brain tumors or any significant intracranial mass. Trigeminal or cavernous sinus tumors causing neuropathic pain are not excluded.
  • Pregnancy or lactation
  • Legal incapacity or limited legal capacity
  • Subjects with a deep brain stimulation implant or with a prior stereotactic thalamic ablation
  • History of hemorrhagic stroke or cerebrovascular event within the past year of treatment exhibiting incomplete resolution
  • History of seizures within past year of treatment
  • Severe kidney disease or on dialysis
  • Subjects who are unable to tolerate medications due to intolerable side effects.
  • Subjects with pain other than craniofacial neuropathic pain.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Sequential Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Transcranial ExAblate
ExAblate Transcranial MR Guided Focused Ultrasound (MRgFUS)
Device: Transcranial ExAblate
ExAblate Thalamotomy for Chronic Trigeminal Neuropathic Pain
Other Names:
  • Thalamotomy
  • MRgFUS
Sham Comparator: Sham Transcranial ExAblate
ExAblate MRgFUS Sham Procedure
Device: Sham Transcranial ExAblate
Sham ExAblate Thalamotomy procedure
Device: Crossover Transcranial Exablate
Subjects randomized to the Sham Exablate could opt for the Crossovover Transcranial Exablate Arm (Exablate Thalamotomy) after completing the Month 3 visit in the Sham Arm.
Other Names:
  • Thalamotomy
  • MRgFUS

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Severity of Device and Procedure Related Complications
Time Frame: At the time of ExAblate Transcranial thalamotomy procedure through 3-months post-thalamotomy
To evaluate the incidence and severity of adverse events associated with ExAblate lesioning of the bilateral medial thalamus for painful neuropathies of the face and head that are severe and treatment-refractory.
At the time of ExAblate Transcranial thalamotomy procedure through 3-months post-thalamotomy
Numeric Pain Rating Scale (NPRS)
Time Frame: Percent Change in NPRS from before treatment to 3 Months following treatment.
Numeric Pain Rating Scale (NPRS) change in worst pain experienced over 24 hours before and at 3 months following bilateral FUS medial thalamotomy versus sham procedures was determined from the 11-point numeric pain rating scale with 0 as no pain and 10 the worst pain imaginable. High NPRS scores are worse pain (0 is no pain, 10 is maximum). Percent change from Baseline at Month 3 was calculated as follows: 100*(NPRS Score at Baseline - NPRS Score at Month 3)/NPRS Score at Baseline. High percent change in NPRS Score from Baseline is better (improved pain).
Percent Change in NPRS from before treatment to 3 Months following treatment.

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Pain Interference Scale 8a v1.0 From the Patient-Reported Outcomes Measurement Information Systems (PROMIS) Pain Inventory
Time Frame: From pre-treatment through 3 months following treatment.
The Pain Interference 8a v1.0 Scale (Short Form) from the Patient-Reported Outcomes Measurement Information Systems (PROMIS) Pain Inventory is an 8-item patient completed short form with each item on a 5-point scale (0-4). The total score possible ranges from 0-32. The PROMIS pain interference scale measures the degree to which pain interferes with activities of daily living. A high percent change from Baseline at 3 Months post-treatment is better, shows improvement.
From pre-treatment through 3 months following treatment.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
InSightec

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: William J Elias, MD, University of Virginia

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 1, 2017

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
October 1, 2023

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 1, 2023

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
October 5, 2017

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 10, 2017

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
October 16, 2017

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 3, 2023

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 8, 2023

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • NP002

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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