GastroparesisNCT04207996
Vagus Nerve Response in Gastroparesis Patients
An observational study of Gastroparesis, run by Indiana University at 1 site in United States.
Trial summary
This study aims to characterize how vagus nerve compound action potentials (CNAPs) conduct along the vagus nerve in gastroparetic patients receiving GES therapy using a flexible, non-invasive multielectrode array (MEA). Read more about this study
- Who is it for?
- Ages 18 to 80 years
- Conditions the study is for
- Gastroparesis
- How many people
- 45 participants
- Where
- 1 siteUnited States
- Study dates
- 1 Sep 2019to 27 May 2021
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 80 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: All subjects 18 years and above who have a gastric electrical stimulator placed for gastroparesis
Who may be able to join
- Gastroparetic patient with a stimulator (Enterra Device placed)
- Aged 18-80 years
- Willing to have electrodes placed on the neck
Who cannot join
- Unable to provide consent
- Pregnant females
- Prisoners
Trial locations and contacts
1 site in 1 country.
United States1 site
Indiana University Hosptial
Indianapolis, Indiana, 46202
About this study
Official title: High Resolution, Noninvasive Measurement and Functional Classification of Vagal Nerve Response Patterns in Relation to Gastroparesis Symptom Management Using Gastric Electrical Stimulation Therapy
This study aims to characterize how vagus nerve compound action potentials (CNAPs) conduct along the vagus nerve in gastroparetic patients receiving GES therapy using a flexible, non-invasive multielectrode array (MEA).
Read the detailed description
During Phase
1, in a small cohort of 5-10 gastroparetic patients receiving GES therapy, we will determine the optimal multielectrode array (MEA) recording electrode configuration (e.g., surface area covered and electrode density) for the noninvasive measurement of gastric electrical stimulation (GES) evoked compound nerve action potentials (CNAP) from the skin surface over the left and right cervical vagus nerve. During Phase 2, a study of 15-30 gastroparetic patients receiving GES therapy, we will use the optimal MEA configuration identified in Task 1 to measure and classify the vagal CNAP response signature (including the direction of travel and anatomical location of the strongest signal (e.g., to infer the anatomical course of the cervical vagus in each subject) with respect to subject-reported symptom scores via the 9-item Gastroparesis Cardinal Symptom Index (GCSI) survey. We will cross-reference these results with the preliminary results obtained with bipolar ECG electrodes.
Phase 1:
Subjects will complete a symptom survey questionnaire and Gastric Cardinal Symptom Index (GCSI) questionnaire. Two electrocardiography (ECG) electrodes will be placed on both sides of the neck overlying the area near the carotid pulse (which overlies the carotid artery in the neck on the side of your neck) where the vagus nerve is located.This is done in order to measure the vagal nerve electrical impulses in the neck (electrical signal travelling in the nerve).
Two ECG electrodes will be placed on each of the arms and one on the chest for measurement of electrocardiogram (ECG) ( a test to measure the electrical activity of your heart). Three ECG electrodes may be placed on the stomach to measure the electrical activity of the stomach.
After the placement of the electrodes, a 2-5 minute recording will be made.The GES device will be interrogated (data will be obtained) for the settings of the device and these will be recorded by the study team. After the recording, the electrodes will be removed from the neck and a newer kind of electrodes called as MEA (Multi electrode Array)) devices that contain multiple (tens to thousands of small electrodes) will be placed on either one, or both sides of the neck. This film will help capture the vagus signal from a large area and help define the path of the vagus nerve. After the placement of this film with small electrodes, another 2-5 minute recording will be made. The electrodes will then be removed and subject will be allowed to go home.
The total time required for Phase 1 will be approximately an hour (60 minutes).
Phase 2:
Subject will complete a symptom survey questionnaire and Gastric Cardinal Symptom Index (GCSI) questionnaire. Multiple electrodes (MEA) will be placed on either one or both sides of the neck. One ECG electrodes will be placed on each of the arms, and one on the chest for measurement of electrocardiogram (ECG). Three ECG electrodes will be placed on the stomach to measure the electrical activity of the stomach. After the placement of the electrodes a 2-5 minute recording will be made. The GES device will be interrogated (data will be obtained) for the settings and these will be recorded by the study team. With the GES stimulator on, a 2-5 minute recording will be made. Then, the GES stimulator will be reprogrammed to deliver the signal at 50% of the original power, and another 2-5 minute recording will be made. Then, the device will again be programmed to deliver the signal at 25% of the original power setting on the device. Another 2-5 minute recording will be made. After this, the device will be reprogrammed to the original settings. The electrodes will then be removed and subject will be allowed to go home.
The total time required for Phase 2 will be approximately an hour (60 minutes).
- Conditions
- Gastroparesis
- Medical subject headings
- Gastroparesis
What is being measured
The primary outcome is the main question the study is designed to answer.
Optimal MEA configuration
Identify the optimal MEA configuration for vagal response capture
Measured: 3 years
GES and symptom survey
Identify the compound nerve action potential in each subject and correlate that with the symptom survey data collected for each subject
Measured: 3 years
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted23 Dec 2019
- Study start1 Sep 2019
- Primary completion27 May 2021
- Study completion27 May 2021
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for GastroparesisStudies of the same condition, open and under way.
- More trials run by Indiana UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Prospective
- Enrolment
- 45 participants (actual)
Sponsor and investigators
- Lead sponsor
- Indiana University
- Sponsor type
- University, hospital or other
- Collaborators
- Purdue University
- Responsible party
- Principal investigator, Thomas V. Nowak, Indiana University
- Investigators
- Thomas V Nowak, MD, Principal investigator, Indiana University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04207996
- Sponsor's protocol ID
- MEA study
- Status last verified
- Aug 2026
- First submitted
- 17 Dec 2019
- Last updated
- 29 Sep 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 29 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- High Resolution, Noninvasive Measurement and Functional Classification of Vagal Nerve Response Patterns in Relation to Gastroparesis Symptom Management Using Gastric Electrical Stimulation Therapy
- ClinicalTrials.gov ID
- NCT04207996
- Acronym / sponsor ID
- MEA study
- Conditions
- Gastroparesis
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 45 participants (actual)
- Lead sponsor
- Indiana UniversityUniversity, hospital or other
- Collaborators
- Purdue University
- Study start
- 1 Sep 2019 (actual)
- Primary completion
- 27 May 2021 (actual)
- Study completion
- 27 May 2021 (actual)
- First posted
- 23 Dec 2019 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study aims to characterize how vagus nerve compound action potentials (CNAPs) conduct along the vagus nerve in gastroparetic patients receiving GES therapy using a flexible, non-invasive multielectrode array (MEA).
Detailed description
During Phase
1, in a small cohort of 5-10 gastroparetic patients receiving GES therapy, we will determine the optimal multielectrode array (MEA) recording electrode configuration (e.g., surface area covered and electrode density) for the noninvasive measurement of gastric electrical stimulation (GES) evoked compound nerve action potentials (CNAP) from the skin surface over the left and right cervical vagus nerve. During Phase 2, a study of 15-30 gastroparetic patients receiving GES therapy, we will use the optimal MEA configuration identified in Task 1 to measure and classify the vagal CNAP response signature (including the direction of travel and anatomical location of the strongest signal (e.g., to infer the anatomical course of the cervical vagus in each subject) with respect to subject-reported symptom scores via the 9-item Gastroparesis Cardinal Symptom Index (GCSI) survey. We will cross-reference these results with the preliminary results obtained with bipolar ECG electrodes.
Phase 1:
Subjects will complete a symptom survey questionnaire and Gastric Cardinal Symptom Index (GCSI) questionnaire. Two electrocardiography (ECG) electrodes will be placed on both sides of the neck overlying the area near the carotid pulse (which overlies the carotid artery in the neck on the side of your neck) where the vagus nerve is located.This is done in order to measure the vagal nerve electrical impulses in the neck (electrical signal travelling in the nerve).
Two ECG electrodes will be placed on each of the arms and one on the chest for measurement of electrocardiogram (ECG) ( a test to measure the electrical activity of your heart). Three ECG electrodes may be placed on the stomach to measure the electrical activity of the stomach.
After the placement of the electrodes, a 2-5 minute recording will be made.The GES device will be interrogated (data will be obtained) for the settings of the device and these will be recorded by the study team. After the recording, the electrodes will be removed from the neck and a newer kind of electrodes called as MEA (Multi electrode Array)) devices that contain multiple (tens to thousands of small electrodes) will be placed on either one, or both sides of the neck. This film will help capture the vagus signal from a large area and help define the path of the vagus nerve. After the placement of this film with small electrodes, another 2-5 minute recording will be made. The electrodes will then be removed and subject will be allowed to go home.
The total time required for Phase 1 will be approximately an hour (60 minutes).
Phase 2:
Subject will complete a symptom survey questionnaire and Gastric Cardinal Symptom Index (GCSI) questionnaire. Multiple electrodes (MEA) will be placed on either one or both sides of the neck. One ECG electrodes will be placed on each of the arms, and one on the chest for measurement of electrocardiogram (ECG). Three ECG electrodes will be placed on the stomach to measure the electrical activity of the stomach. After the placement of the electrodes a 2-5 minute recording will be made. The GES device will be interrogated (data will be obtained) for the settings and these will be recorded by the study team. With the GES stimulator on, a 2-5 minute recording will be made. Then, the GES stimulator will be reprogrammed to deliver the signal at 50% of the original power, and another 2-5 minute recording will be made. Then, the device will again be programmed to deliver the signal at 25% of the original power setting on the device. Another 2-5 minute recording will be made. After this, the device will be reprogrammed to the original settings. The electrodes will then be removed and subject will be allowed to go home.
The total time required for Phase 2 will be approximately an hour (60 minutes).
Study design
- Observational model
- Case only
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 to 80 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- All subjects 18 years and above who have a gastric electrical stimulator placed for gastroparesis
Key inclusion criteria (3 listed)
- Gastroparetic patient with a stimulator (Enterra Device placed)
- Aged 18-80 years
- Willing to have electrodes placed on the neck
Key exclusion criteria (3 listed)
- Unable to provide consent
- Pregnant females
- Prisoners
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Optimal MEA configuration
Time frame: 3 years
Identify the optimal MEA configuration for vagal response capture
GES and symptom survey
Time frame: 3 years
Identify the compound nerve action potential in each subject and correlate that with the symptom survey data collected for each subject
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Sep 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Thomas V Nowak, MD principal investigator
Indiana University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Gastroparesis, run by Indiana University at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 3 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 29 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Optimal MEA configuration (time frame: 3 years). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Sep 2026.