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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT04711044
Other study ID # N-20200005 (third sub-project)
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date February 1, 2021
Est. completion date July 5, 2021

Study information

Verified date July 2021
Source Aalborg University
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

This third sub-project aims to evaluate the interaction between the TRPM8 receptor and pruritus by studying the anti-pruritic effect of TPRM8-agonist L-menthol on histaminergic and non-histaminergic itch induced using three different pruritogens: histamine, cowhage and papain.


Recruitment information / eligibility

Status Completed
Enrollment 20
Est. completion date July 5, 2021
Est. primary completion date June 30, 2021
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years to 60 Years
Eligibility Inclusion Criteria: - Healthy men and women - 18-60 years - Speak and understand English Exclusion Criteria: - Pregnancy or lactation - Drug addiction defined as any use of cannabis, opioids or other addictive drugs - Previous or current history of neurological, dermatological, immunological musculoskeletal, cardiac disorder or mental illnesses that may affect the results (e.g. neuropathy, muscular pain in the upper extremities, etc.). - Lack of ability to cooperate - Current use of medications that may affect the trial such as antihistamines, antipsychotics and pain killers, as well as systemic or topical steroids. - Skin diseases - Moles, scars or tattoos in the area to be treated or tested. - Hypersensitivity to papaya and mango fruit, cashew nuts, rubber latex - Consumption of alcohol or painkillers 24 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)

Study Design


Related Conditions & MeSH terms


Intervention

Other:
Papain
Papain will be applied using cowhage spicules inactivated by heat
Histamine
To deliver histamine, standard allergy skin prick test (SPT) lancets are applied
Cowhage
Cowhage spicules are 1-2 mm in length and have a diameter of 1-3 µm. The spicules are inserted by gently rubbing 30-35 spicules into a 1 cm diameter skin area.
L-menthol
A 1 mL aliquot is dispensed onto a 2,5 × 2,5 cm cotton pad and placed on a 6 × 6 cm sheet of medical tape.

Locations

Country Name City State
Denmark Aalborg University Aalborg Nordjylland

Sponsors (1)

Lead Sponsor Collaborator
Aalborg University

Country where clinical trial is conducted

Denmark, 

Outcome

Type Measure Description Time frame Safety issue
Primary Measuring itch intensity by computerized Visual Analog Scale Scoring We will ask the subjects to rate the sensation of itch on a 100 mm VAS scale ranging from 0 to 100 where 0 indicates "no itch" and 100 indicates "worst itch imaginable For 15 minutes
Primary Measuring pain intensity by computerized Visual Analog Scale Scoring We will ask the subjects to rate the sensation of pain on a 100 mm VAS scale ranging from 0 to 100 where 0 indicates "no pain" and 100 indicates "worst pain imaginable". For 15 minutes
Primary Superficial blood perfusion measurement Superficial blood perfusion is measured by a Speckle contrast imager After 15 minutes
Primary Measuring Alloknesis Alloknesis is measured by using mildly pruritic, non-painful von Frey nylon filaments of a predetermined intensity (generally 5-30 milliNewton of force). 15 minutes
Secondary Measurement of Cold Detection Thresholds (CDT) The tests for thermal sensation will all be conducted using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device. 15 minutes
Secondary Measurement of Cold PainThresholds (CPT) The tests for thermal sensation will all be conducted using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device. 15 minutes
Secondary Measurement of Heat Pain Thresholds (HPT) The tests for thermal sensation will all be conducted using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device. 15 minutes
Secondary Measurement of Warm Detection Thresholds (WDT) The tests for thermal sensation will all be conducted using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device. 15 minutes
Secondary Measurement of Pain to Supra-threshold Heat Stimuli The tests for thermal sensation will all be conducted using a PATHWAY ATS (Medoc Ltd, Israel) thermal sensory testing device. 15 minutes
Secondary Measurement of Mechanical Pain Thresholds (MPT) This test is conducted using a pin-prick set. 15 minutes
Secondary Measurement of Mechanical Pain Sensitivity (MPS) This test is conducted using a pin-prick set. 15 minutes
Secondary Touch Pleasantness (TP) Pleasant touch sensation measured using a standardized sensory brush 15 minutes
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