Use of QTRAC Technique to Measure Axonal Excitability in Anti-MAG Neuropathy (EXCIMAG)

February 10, 2023 updated by: Fondation Ophtalmologique Adolphe de Rothschild

Axonal Excitability Measured by QTRAC Technique in Patients With Anti-MAG Neuropathy

The QTRAC method is an electrophysiological technique that assesses peripheral nerve axonal excitability, using computerized analysis of the muscular response of musculus abductor pollicis brevis, to series of electrical stimulations of the median nerve.

Because of its high sensitivity to small changes in axonal excitability, QTRAC may help improve the follow-up of patients suffering from peripheral neuropathy caused by anti-myelin-associated-glycoprotein antibodies (anti-MAG neuropathy), as axonal excitability is early affected in this disease.

The main aim of the study is to compare QTRAC results in anti-MAG neuropathy patients, with QTRAC results in healthy persons (matched for sex and age).

A secondary aim is to determine whether or not the disease's clinical severity (measured by quantitative clinical scores) is correlated with the results of the QTRAC and could be predicted by a model based on the several parameters measured in the QTRAC exploration.

100 anti-MAG neuropathy patients will undergo a QTRAC exploration and a thorough neurological examination with clinical scoring. The results will be compared with data (matched by sex and age) from the reference database on healthy subjects, that is provided with the QTRAC software.

The investigators expect to prove that QTRAC results are modified in anti-MAG neuropathy patients, and that the clinical severity of the disease can be predicted by a combination of QTRAC-measured parameters.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Terminated

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.

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.
6

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 Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • France
      • Bordeaux, France, 33076
        • Service de Neurologie Hôpital Pellegrin
      • Créteil, France, 94000
        • Service de Neurologie Hôpital Henry Mondor
      • Lille, France, 59037
        • Département de Neurologie Hôpital Roger Salengro
      • Limoges, France
        • service de neurologie, CHU Limoges
      • Lyon, France, 69677
        • Service ENMG et pathologies Neuro Musculaires, Hôpital Neurologique Pierre Wertheimer
      • Nantes, France, 44093
        • Laboratoire des explorations fonctionnelles, Hôtel Dieu
      • Paris, France, 75019
        • Service de Neurologie, Fondation Ophtalmologique Adolphe de Rothschild
      • Saint-Etienne, France, 42055
        • Service de Neurologie CHU St Etienne

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

18 years to 90 years (ADULT, OLDER_ADULT)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Anti-MAG neuropathy (peripheral neuropathy and IgM monoclonal gammopathy with anti-MAG activity superior to 1000 BTU)

Exclusion Criteria:

  • current treatment with a medication that modifies peripheral nerve excitability (e.g. anticonvulsivants)

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: DIAGNOSTIC
  • Allocation: NA
  • Interventional Model: SINGLE_GROUP
  • Masking: NONE

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: Patients
Patients suffering from anti-MAG neuropathy
Other: QTRAC assessment
Computerized analysis of the muscular response of musculus abductor pollicis brevis, to series of electrical stimulations of the median nerve
Other: Clinical assessment of peripheral nerve function
Clinometric assessment using RT-MRC, Martin vigirometer, RT-mISS, T25W, 9 hole peg test, and ataxia scale

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
QTRAC-measured refractority of the median nerve
Time Frame: Inclusion
the duration of the refractory period of the median nerve (expressed in milliseconds) is automatically measured by the QTRAC system, using a series of double electrical stimulations (the first being supra-maximal and the second, sub-maximal) and progressively increasing the time between the two stimuli.
Inclusion

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.
Fondation Ophtalmologique Adolphe de Rothschild

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.
November 1, 2014

Primary Completion (ACTUAL)

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.
November 1, 2019

Study Completion (ACTUAL)

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.
February 1, 2022

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).
March 3, 2015

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.
June 8, 2015

First Posted (ESTIMATE)

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.
June 11, 2015

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.
February 13, 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.
February 10, 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.
February 1, 2023

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.
  • AGN_2014-20

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.

Clinical Trials on Peripheral Neuropathy Associated With Anti-myelin Associated Glycoprotein Antibodies (Anti-MAG Neuropathy)

Clinical Trials on QTRAC assessment

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings