Inter-arm and Inter-period Reproducability of the Dermal Blood Flow Response After a Histamine Skin Prick.

Study Overview
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Brief Summary
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To evaluate the inter-arm and inter-period reproducibility of the dermal blood flow response induced by a skin prick of histamine, subjects will receive histamine (10 mg/ml) and negative control skin pricks on the volar surface of both forearms during two subsequent study visits to allow an intra-individual comparison. Changes in dermal blood flow will be measured during the hour after the skin pricks with laser Doppler and/or laser speckle contrast imaging.

Official Title
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Inter-arm and Inter-period Reproducability of the Dermal Blood Flow Response After a Histamine Skin Prick.

Conditions
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Pruritus

Intervention / Treatment
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* Procedure: Histamine 10 mg/ml skin prick
* Procedure: Placebo (saline) skin prick


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subject is a white male ≥ 18 and ≤ 45 years of age at the time of screening Subject is a nonsmoker for at least 6 months prior to the study start Subject has a body mass index ≥ 18 and ≤ 30 kg/m2 Subject has a clear increase in histamine-induced dermal blood flow Subject is judged to be in good health on the basis of medical history, physical examination and vital signs Subject understands the procedures and agrees to comply with them for the entire length of the study by giving written informed consent Exclusion Criteria: Subject has excessive hair growth on the volar surface of the forearm Subject has a past or present history of diffuse dermatological conditions including eczema, scleroderma, psoriasis, urticaria, dermatographism and dermatitis Subject has any abnormality on the skin of the forearm, possibly interfering with the study assessments including tattoos, keloids, tumors, ulcers, burns, flaps and grafts Subject cannot avoid excessive tanning (any exposure to sunlight or a tanning bed which would cause a sunburn reaction) throughout the study and cannot cover the forearms 24 hours before and after each study visit Subject currently uses lotions, oils, depilatory preparations, makeup or other topical treatments on the arms and on a regular basis which cannot be discontinued for the duration of the study; subject has used any topical treatments within 7 days of the start of the study Subject has a past or present history of (symptomatic) asthma Subject has a history of severe allergic reactions to food or drugs or adverse experiences of a serious nature related to the administration of either a marketed or investigational drug, including histamine Subject currently uses any prescription or nonprescription drugs on a regular basis which cannot be discontinued for the duration of the study; subject has used any prescription or nonprescription medication within 14 days of the start of the study Subject is a habitual and heavy consumer of coffee or caffeinated beverages (more than approximately 4 cups of tea, coffee or cola per day) at the time of the study. Subjects who have reduced their consumption to ≤ 4 cups per day at least 1 week prior to enrollment may participate. Subjects who cannot refrain from caffeinated beverages 24 hours before the study visit; Subject is unable to refrain from drinking alcohol 24 hours prior to histamine application, is currently a regular user (including recreational use) of any illicit drugs, or has a history of drug (including alcohol) abuse. A drug screen will include amphetamines/ methamphetamines, methylenedioxymethamphetamine, benzodiazepines, barbiturates, cocaine, cannabis, tricyclic antidepressants, methadone and opiates Subject cannot refrain from being around second hand smoke 24 hours prior to histamine application or uses nicotine-containing products. Ex-smokers should have ceased smoking at least 6 months prior to screening Subject has any of the following vital sign measurements at screening: heart rate ≤ 40 or ≥ 100 beats/min, diastolic blood pressure ≤ 50 or ≥ 89 mmHg and/or systolic Blood Pressure ≤ 90 or ≥ 139 mmHg Subject has been involved in testing an investigational drug in another clinical study within the last 4 weeks or 5 half-lives Subject has evidence of a clinically significant active infection, fever of 38°C or above at the time of the study visits Subject has a history or current cardiovascular, respiratory, hepatic, renal, gastrointestinal or neurological disorders capable of significantly altering the absorption, metabolism or elimination of drugs Subject is in a situation or has a condition, which, in the opinion of the investigator, may interfere with safe and optimal participation in the study Subject has a history of any illness or disorder, which, in the opinion of the investigator, might confound the results of the study.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Interventional Model Description: Single-blind, single-group study
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Histamine and placebo skin pricks<br>Each subject will receive the same histamine (10 mg/ml) and control (saline) skin prick on the right and left forearm on both study visits, to allow an intra-individual comparison | Procedure: Histamine 10 mg/ml skin prick<br>* Skin prick through 5 µL histamine diHCl (10 mg/ml)<br>Procedure: Placebo (saline) skin prick<br>* Skin prick through 5 µL saline (0.9% NaCl)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change in dermal blood flow induced by histamine skin pricks, compared to baseline and placebo in terms of inter-period and inter-arm reproducability |  | The dermal blood flow will be assessed before (baseline) and every 5 minutes during the hour following the skin pricks |