- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05395026
Systematic Evaluation of VNS Parameters
Systematic Evaluation of Vagus Nerve Stimulation Parameters on Cardiac Rhythm, Laryngeal Muscle Electromyography, and Vagus Nerve Activation in Acute and Chronic Implantations
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
This study will recruit adult participants with epilepsy who are undergoing planned surgery either for an initial implant of a vagus nerve stimulation (VNS) device or for replacement of their VNS implanted pulse generator (IPG) due to battery depletion. The primary study goals are to measure the activation of the vagus nerve and the side effects of vagus nerve stimulation (neck muscle contractions, changes in heart rate) across a range of stimulation parameters typically used in VNS therapy for epilepsy. This mapping of the parameter space may inform future device programming to improve electrical activation of the vagus nerve and/or to reduce side effects. All study participants will be assigned to a single study group and will complete the same study procedures.
The research study will take place during VNS surgery. For participants undergoing a first VNS implant surgery, once the vagus nerve is exposed and before placing the VNS electrodes, the investigators may image the nerve with ultrasound. Mapping of the parameter space will then occur after placement of the cuff electrodes around the cervical vagus nerve for participants undergoing a first VNS implant surgery or removal of the IPG with the depleted battery for patients undergoing IPG replacement surgery. Temporary sterile extension wires will connect the implanted VNS electrode to the research stimulation system. Research procedures will involve stimulating the vagus nerve through the standard implanted clinical VNS electrodes over a range of stimulation parameters. At the same time, the investigators will record how changes in stimulation affect the activity of the vagus nerve (measured by electroneurogram (ENG)), the response of the neck and throat muscles (by electromyogram (EMG)) and the heart rate (by electrocardiogram (EKG)). Several stimulation trials will be conducted with different VNS parameters (pulse duration, pulse amplitude, and pulse repetition rate) delivered in randomized order. Stimulation parameters will be within the ranges used for clinical therapy and will not exceed those that produce a 25% reduction in heart rate. Measurements will be made during 10 to 60 second trials, in which stimulation will be off for the first section (baseline), on for the second section (responses to stimulation), and off for the final section (recovery). The stimulus waveform will be a charge-balanced biphasic pulse, with values of charge density (D) limited to values below the nondamaging limits that are well-established in literature.
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Locations
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North Carolina
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Durham, North Carolina, United States, 27710
- Duke University Medical Center
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- adult epilepsy patients undergoing VNS electrode implantation or implanted pulse generator (IPG) replacement surgery
- in good health
- neurologically stable aside from epilepsy
- able to provide informed consent
Exclusion Criteria:
- patients with another implanted electrical device (besides VNS)
- a history of heart conditions that the surgeon considers a contraindication to study participation
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Experimental: Investigational Stimulation Parameters
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VNS electrical stimulation parameters (pulse duration, pulse amplitude, and pulse frequency) will be systematically changed to determine the effect on vagus nerve activation, laryngeal muscle contraction, and heart rate.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
stimulation amplitude threshold
Time Frame: During procedure (30 minutes)
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The stimulation amplitude threshold is the amplitude when vagus nerve stimulation (VNS) activates the laryngeal muscles and has potential to cause subject discomfort during stimulation.
The stimulation amplitude threshold will be measured with the NIM-EMG endotracheal tube recording, and the threshold will be determined as the amplitude that causes the first evoked potential in the laryngeal muscles.
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During procedure (30 minutes)
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Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Warren M Grill, PhD, Duke University
Publications and helpful links
General Publications
- Cogan SF, Ludwig KA, Welle CG, Takmakov P. Tissue damage thresholds during therapeutic electrical stimulation. J Neural Eng. 2016 Apr;13(2):021001. doi: 10.1088/1741-2560/13/2/021001. Epub 2016 Jan 20.
- Kumsa D, Steinke GK, Molnar GF, Hudak EM, Montague FW, Kelley SC, Untereker DF, Shi A, Hahn BP, Condit C, Lee H, Bardot D, Centeno JA, Krauthamer V, Takmakov PA. Public Regulatory Databases as a Source of Insight for Neuromodulation Devices Stimulation Parameters. Neuromodulation. 2018 Feb;21(2):117-125. doi: 10.1111/ner.12641. Epub 2017 Aug 7.
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- Pro00103473
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
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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