- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03587220
A Mechanistic Evaluation of the Nociceptive Desensitizing Properties of Topical Capsaicin
April 17, 2020 updated by: Silvia Lo Vecchio, Aalborg University
En undersøgelse af Mekanismerne Bag Nociceptiv Desensibilisering forårsaget af Topikal Capsaicin
The aim of this project is to study the role of transient receptor potential (TRP-) channel V1 (TRPV1+) fibers in the development of cutaneous inflammation induced by epidermal Ultraviolet-B damage.
Moreover, in this project the investigators want to evaluate if the capsaicin-desensitization action can still be induced in a skin area pretreated with topical, local anesthetic lidocaine.
Study Overview
Status
Completed
Intervention / Treatment
Detailed Description
In this project the Ultraviolet- B pain model, a model using type B ultraviolet rays to induce a first-degree sunburn, will be used to induce a non-specific inflammation in the skin.
This model is well-known to produce both peripheral and central hyperalgesia through sensitization of peripheral and central nociceptors.
Capsaicin, the active substance in chili peppers, is currently used to treat peripheral neuropathic pain, and prolonged application of 8% capsaicin patch causes profound desensitization to painful heat stimuli and itch provocations.
Therefore, the investigators would like to monitor the development of unspecific UVB-cutaneous inflammation and consequent neurogenic flare in a capsaicin pre-treated area.
Moreover the investigators want to test if pre-treating the skin with lidocaine can reduce the pain associated with the capsaicin application without affecting its desensitization action.
Study Type
Interventional
Enrollment (Actual)
44
Phase
- 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
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Nordjylland
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Aalborg, Nordjylland, Denmark, 9000
- Silvia Lo Vecchio
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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
Ages Eligible for Study
18 years to 60 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion criteria:
- Healthy men and women
- 18-60 years
- Caucasian descent (only in sub-study 1)
- Speak and understand English
Exclusion criteria:
- Pregnancy or lactation
- Drug addiction defined as any use of cannabis, opioids or other drugs
- Previous or current neurologic, musculoskeletal or mental illnesses
- Lack of ability to cooperate
- Current use of medications that may affect the trial
- Skin diseases
- Consumption of alcohol or painkillers 24 hours before the study days and between these
- Moles or tattoos in the area to be treated or tested.
- Exposure of the irradiated area to UV radiation (e.g., sun) 48 hours before the study days and between these
- Acute or chronic pain
- Participation in other trials within 1 week of study entry (4 weeks in the case of pharmaceutical trials)
- Known history of anaphylactic shock, or local allergy (contact dermatitis) to lidocaine, prilocaine or other local anaesthetics of the amide type.
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: Basic Science
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Capsaicin+UVB group
All subjects will be treated with capsaicin, placebo + UVB, or Capsaicin+UVB.
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Capsaicin patches (dosage form: patch 8% Qutenza) will be applied on 4x4 cm squared areas on the volar forearm.
The patches will be left in place for 24h and 3 hours after which they will be removed.
Two circular areas (Ø 2 cm) on the forearm are irradiated with 2 x MED (Minimal Erythema Dose) dose of UVB using a calibrated UVB machine (290-320nm wavelength), Saal Mann Multi Tester (Mann Saal, LT SBC 400 Herford, Germany).
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Experimental: Capsaicin + EMLA group
All subjects will be pre-treated with lidocain cream before capsaicin application
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Capsaicin patches (dosage form: patch 8% Qutenza) will be applied on 4x4 cm squared areas on the volar forearm.
The patches will be left in place for 24h and 3 hours after which they will be removed.
To deliver histamine, standard allergy skin prick test (SPT) lancets are applied.
The lancets have a 1 mm shouldered tip adapt to introduce a small amount of test substance extremely locally and approximately at the dermo-epidermal junction.
Cutaneous anaesthesia will be topically induced by using EMLA cream 5%, a local anaesthetic cream consisting of equal parts of lidocaine and prilocaine (1g contains 25 mg of lidocaine and 25 mg of prilocaine)
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Superficial blood perfusion measured by a Speckle contrast imager (FLPI, Moor Instruments, England).
Time Frame: Changes from baseline to 7 days after intervention
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Changes from baseline to 7 days after intervention
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Measurement of Warm Detection Thresholds and Heat thresholds by using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device.
Time Frame: Changes from baseline to 7 days after intervention
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Changes from baseline to 7 days after intervention
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Measurement of Pain to Supra-threshold Heat Stimuli by using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device.
Time Frame: Changes from baseline to 7 days after intervention
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Changes from baseline to 7 days after intervention
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Measurement of Mechanical Pain Thresholds and Sensitivity using a pin-prick set consisting of 8 needles each having a diameter of 0.6 mm and different force applications: 0.8, 1.6, 3.2, 6.4, 12.8, 25.6, 50.1 and 60.0 g.
Time Frame: Changes from baseline to 7 days after intervention
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Changes from baseline to 7 days after intervention
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Trans-epidermal Water Loss (TEWL) using a 2x2 cm probe to measure the humidity gradient of the skin.
Time Frame: Changes from baseline to 7 days after intervention
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Changes from baseline to 7 days after intervention
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
assessment of pain rating by using a visual analog scales (VAS)
Time Frame: Change from baseline to 24 h
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The subject will report the peak and average of the perceived pain sensation during the last 24 hours (on a VAs scale from 0 indicating 'no pain' to100 indicating 'worst imaginable pain').
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Change from baseline to 24 h
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Itch rating by using a visual analog scales (VAS)
Time Frame: Changes from baseline to 7 days after intervention
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Itch is monitored for 9 minutes using a visual analog scale from 0 indicating 'no itch' to100 indicating 'worst imaginable itch.
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Changes from baseline to 7 days after intervention
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
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)
August 1, 2018
Primary Completion (Actual)
August 31, 2019
Study Completion (Actual)
December 31, 2019
Study Registration Dates
First Submitted
June 21, 2018
First Submitted That Met QC Criteria
July 13, 2018
First Posted (Actual)
July 16, 2018
Study Record Updates
Last Update Posted (Actual)
April 20, 2020
Last Update Submitted That Met QC Criteria
April 17, 2020
Last Verified
April 1, 2020
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Nervous System Diseases
- Pain
- Neurologic Manifestations
- Neuromuscular Diseases
- Peripheral Nervous System Diseases
- Neuralgia
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Anti-Arrhythmia Agents
- Central Nervous System Depressants
- Peripheral Nervous System Agents
- Sensory System Agents
- Anesthetics
- Dermatologic Agents
- Membrane Transport Modulators
- Anesthetics, Local
- Voltage-Gated Sodium Channel Blockers
- Sodium Channel Blockers
- Histamine Agents
- Antipruritics
- Histamine Agonists
- Lidocaine
- Capsaicin
- Histamine
Other Study ID Numbers
- N-20180034
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
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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