Clinical Trials Logo

Clinical Trial Details — Status: Enrolling by invitation

Administrative data

NCT number NCT05195177
Other study ID # N-2020001 4-sub-project
Secondary ID
Status Enrolling by invitation
Phase N/A
First received
Last updated
Start date November 25, 2021
Est. completion date December 20, 2023

Study information

Verified date August 2023
Source Aalborg University
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

This subproject aims to evaluate a new nerve excitability protocol to induce itch in healthy controls by electrical stimulation. Itch has many similarities with pain, and the nerve fibers that mediate the two sensations probably have the same morphological and excitability properties. The method used in this project will be the same as our research group uses for studying nociceptor fibers (PTT technique), but the focus is on the itch sensation. Since the itch fibers also terminate in the epidermis, our PTT technique should also be able to activate itch fibers, similar to pain fibers. If itch could be effectively induced by electrical stimulation, this would generate a valuable tool for studying itch in healthy controls. The sub-project takes place in 2 sessions (2 hours each).


Recruitment information / eligibility

Status Enrolling by invitation
Enrollment 20
Est. completion date December 20, 2023
Est. primary completion date December 20, 2023
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years to 80 Years
Eligibility Inclusion Criteria: Healthy men and women in the age 18-80 years who speak and understand Exclusion Criteria: - Pregnancy or breast feeding - Drug addiction defined as the use of cannabis, opioids or other drugs - Previous and present neurologic, musculoskeletal or mental illnesses (e.g., epilepsy, neuropathy, fibromyalgia and depression) - Skin diseases - Past history of conditions possibly leading to neuropathy - Inability to cooperate - Current use of medications that may affect the study, e.g., analgesics - Previous traumatic experience of an electrical accident - Consumption of alcohol or painkillers within the last 24 hours - Participation in other pain studies throughout the study period - Patients with cardiac diseases (e.g., pacemaker).

Study Design


Related Conditions & MeSH terms


Intervention

Drug:
Anti-histamine cream 1 hour
At the start of session 1, one area of the middle forearms of the participant will be located (4x4cm). On the area, anti-histamine cream will be applied for approximately 1 hour.
Local anesthetic cream 1 hour
At the start of session 2, one area of the middle forearms of the participant will be located (4x4cm). On the area, local anesthetic cream (2.5% lidocain/2.5 prilocaine) will be applied for approximately 1 hour.

Locations

Country Name City State
Denmark Aalborg University Aalborg Aalborg Ø

Sponsors (1)

Lead Sponsor Collaborator
Aalborg University

Country where clinical trial is conducted

Denmark, 

Outcome

Type Measure Description Time frame Safety issue
Primary Perception threshold for pulse shape 1 The perception threshold will be estimated for the electrical stimuli with pulse shape 1. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 2 The perception threshold will be estimated for the electrical stimuli with pulse shape 2. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 3 The perception threshold will be estimated for the electrical stimuli with pulse shape 3. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 4 The perception threshold will be estimated for the electrical stimuli with pulse shape 4. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 1 when antihistamine cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 1 when anti-histamine cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session one. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 2 when anti-histamine cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 2 when anti-histamine cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session one. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 3 when anti-histamine cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 3 when anti-histamine cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session one. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 4 when anti-histamine cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 4 when anti-histamine cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session one. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 1 when local anaesthetic cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 1 when local anaesthetic cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 2 when local anaesthetic cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 2 when local anaesthetic cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 3 when local anaesthetic cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 3 when local anaesthetic cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session two. The outcome measure takes approximately 5 minutes to estimate.
Primary Perception threshold for pulse shape 4 when local anaesthetic cream has been applied The perception threshold will be estimated for the electrical stimuli with pulse shape 4 when local anaesthetic cream has been applied for approximately an hour. The perception threshold is defined as the transcutaneous electrical current needed for the participant to perceive the stimulus. The electrode will be placed on the arm. The perception threshold will be estimated by the method of limits and the psi method. This outcome measurement will be estimated during session two. The outcome measure takes approximately 5 minutes to estimate.
Primary Sensation for pulse 1 The investigator will ask the participant to rate the sensation of electrical stimulation with pulse 1 for the three different conditions. The conditions are: control (not active cream), antihistamine cream, and local anesthetic cream. The scale is 0-10 for the three sensations touch, itch, and pain. Zero means no sensation, and ten is the worst pain/touch/itch imaginable. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Sensation for pulse 2 The investigator will ask the participant to rate the sensation of electrical stimulation with pulse 2 for the three different conditions. The conditions are: control (not active cream), antihistamine cream, and local anesthetic cream. The scale is 0-10 for the three sensations touch, itch, and pain. Zero means no sensation, and ten is the worst pain/touch/itch imaginable. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Sensation for pulse 3 The investigator will ask the participant to rate the sensation of electrical stimulation with pulse 3 for the three different conditions. The conditions are: control (not active cream), antihistamine cream, and local anesthetic cream. The scale is 0-10 for the three sensations touch, itch, and pain. Zero means no sensation, and ten is the worst pain/touch/itch imaginable. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
Primary Sensation for pulse 4 The investigator will ask the participant to rate the sensation of electrical stimulation with pulse 4 for the three different conditions. The conditions are: control (not active cream), antihistamine cream, and local anesthetic cream. The scale is 0-10 for the three sensations touch, itch, and pain. Zero means no sensation, and ten is the worst pain/touch/itch imaginable. This outcome measurement will be estimated during sessions one and two. The outcome measure takes approximately 5 minutes to estimate.
See also
  Status Clinical Trial Phase
Completed NCT01683552 - Aprepitant in the Management of Biological Therapies-related Severe Pruritus Phase 2
Completed NCT02075632 - Study to Evaluate Product Duration of Use Experience With Alclometasone Dipropionate Cream Phase 2
Completed NCT04515056 - Characterization of New Human Models of Non-histaminergic Itch N/A
Completed NCT04076865 - Evaluation of the Effect Induced by Repeated Administration of Topical Local Anaesthetic (EMLA) on Itch N/A
Completed NCT04588532 - Characterization of BAM8-22 as a New Surrogate Model of Non-histaminergic Itch N/A
Withdrawn NCT03943407 - Characterization of the Toll-like Receptor 7-agonist Imiquimod 3.75% as a New Surrogate Model of Itch N/A
Completed NCT04858360 - Inhibition of Non-histaminergic Pruritus Applied Using 3 Different Pruritogens N/A
Completed NCT04635254 - The Effect of Halophyte-based Cream on Pain and Itch N/A
Not yet recruiting NCT06201715 - Efficacy and Safety of Tofacitinib in Patients With Prurigo Nodularis N/A
Completed NCT06036589 - Characterization of Bovine Adrenal Medulla as a Model of Non-histaminergic Itch N/A
Completed NCT04554888 - Characterization of New Human Models of Non-histaminergic Itch and Their Interaction With the TRPM8 Receptor N/A
Completed NCT04387851 - Learning Mechanisms for Placebo and Nocebo Studies on Somatosensory Sensations: a Systematic Review and Meta-analysis.
Completed NCT03928223 - The Color of Itch; Itch Modification by Color Viewing
Not yet recruiting NCT06245564 - Effect of Ketamine, Amitriptyline and Their Combination on Histaminergic and Non-histaminergic Itch N/A
Completed NCT03576053 - A Mechanistic Evaluation of the Interactions Between Thermoceptive and Pruriceptive Sensory Processing N/A
Completed NCT04700007 - Evaluation of Peripheral Itch Mechanisms Following Injection of Morphine (Second Sub-Project) N/A
Terminated NCT02828787 - Central Mechanisms of Chronic Pruritus: Functional and Structural Brain Imaging. N/A
Completed NCT04115462 - A Relation of Morphine-induced Itch and Pain Processing N/A
Not yet recruiting NCT04197440 - Characterization of Bovine Adrenal Medulla (BAM8-22) as a New Surrogate Model of Non-histaminergic Itch N/A
Completed NCT05249387 - Characterization of Bovine Adrenal Medulla as a New Surrogate Model of Non-histaminergic Itch N/A