The Effect of Intranasal Oxytocin on Pain Sensitivity and Threshold

Study Overview
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Brief Summary
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Oxytocin is neurohypophysial peptide that acts mainly as a neuromodulator in the brain.The vast majority of basic science studies suggested a large effect of oxytocin in minimizing acute pain.Few studies have demonstrated an association between plasma levels of oxytocin and pain in humans. Since addictive properties of oxytocin have not been described, the drug may have important application in the management of acute and chronic pain. No studies have examined the effect of intranasal oxytocin on pain sensitivity and threshold.

Official Title
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The Effect of Intranasal Oxytocin on Pain Sensitivity and Threshold: A Randomized, Double Blinded, Crossover Volunteer Study

Conditions
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Healthy

Intervention / Treatment
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* Procedure: Intervention 1
* Behavioral: Washout Period
* Procedure: Intervention 2


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy males and females volunteers, English speaking Exclusion Criteria: Pregnancy, lactation, allergy to preservatives, mental disease, any chronic pain and any current use of analgesics, anxiety or depression.

Ages Eligible for Study
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Minimum Age: 20 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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All

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: Treatment
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Triple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Oxytocin, then Normal Saline<br>Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of Oxytocin prior to Thermal Evaluation System Testing on intervention 1 (day 1). Following a wash-out period of 13 days the same subject will then receive a nasal spray(s) into each nostril of 4 Units up to 32 units of Normal Saline prior to Thermal Evaluation System Testing on intervention 2 (day 14). | Procedure: Intervention 1<br>* Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of study drug prior to Thermal Evaluation System Testing on intervention 1 (Day 1).<br>* Other names: Day 1;Behavioral: Washout Period<br>* The wash-out period will be between intervention 1 and intervention 2. 13 days in length.<br>Procedure: Intervention 2<br>* Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of study drug prior to Thermal Evaluation System Testing on intervention 2 (Day 14).<br>* Other names: Day 14;|
| Experimental: Normal Saline, then Oxytocin<br>Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of Normal Saline prior to Thermal Evaluation System Testing on intervention 1 (day 1). Following a wash-out period of 14 to 15 days the same subject will then receive nasal spray(s) into each nostril of 4 Units up to 32 units of Oxytocin prior to Thermal Evaluation System Testing on intervention 2 (day 14). | Procedure: Intervention 1<br>* Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of study drug prior to Thermal Evaluation System Testing on intervention 1 (Day 1).<br>* Other names: Day 1;Behavioral: Washout Period<br>* The wash-out period will be between intervention 1 and intervention 2. 13 days in length.<br>Procedure: Intervention 2<br>* Each subject will receive nasal spray(s) into each nostril of 4 Units up to 32 units of study drug prior to Thermal Evaluation System Testing on intervention 2 (Day 14).<br>* Other names: Day 14;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Hot and Cold Thermal Sensory Threshold for Pain at Baseline in Degrees Celsius. | Thermal Sensory Threshold for Pain at baseline prior to study drug administration. Evaluation of subjects baseline responses of perception of hot and cold stimuli utilizing the Medoc Pathway Pain &Sensory Evaluation System (Medoc Ltd, Israel). The baseline response variable was estimated by averaging the subjects response over three trials, with an interval of 30 seconds. A thermode was attached to the subjects hand and the subject was asked to press a mouse button when they perceive the sensation of heat pain or cold pain. The temperature range was 51C to 0C. | Baseline | 
| Hot and Cold Thermal Sensory Threshold for Pain at 45 Minutes in Degrees Celsius. | Thermal Sensory Threshold for Pain at 45 minutes after study drug administration. Evaluation of subjects responses of perception of hot and cold stimuli utilizing the Medoc Pathway Pain &Sensory Evaluation System (Medoc Ltd, Israel). The response variable was estimated by averaging the subjects response over three trials, with an interval of 30 seconds. A thermode was attached to the subjects hand and the subject was asked to press a mouse button when they perceive the sensation of heat pain or cold pain. The temperature range was 51C to 0C. | 45 minutes | 
| Hot and Cold Thermal Sensory Threshold for Pain at 90 Minutes in Degrees Celsius. | Thermal Sensory Threshold for Pain at 90 minutes after study drug administration. Evaluation of subjects responses of perception of hot and cold stimuli utilizing the Medoc Pathway Pain &Sensory Evaluation System (Medoc Ltd, Israel). The response variable was estimated by averaging the subjects response over three trials, with an interval of 30 seconds. A thermode was attached to the subjects hand and the subject was asked to press a mouse button when they perceive the sensation of heat pain or cold pain. The temperature range was 51C to 0C. | 90 minutes | 
| Mechanical Pain Threshold for Pain at Baseline in Grams. | Mechanical pain threshold for pain at baseline utilizing a digital electrovonfrey anesthesiometer (IITC model Alemo 2290-4; Woodland Hills, CA, USA). The subjects response to painful stimulus was recorded in grams. Each variable was estimated by averaging a participant's responses over 3 trials, with an intertrial interval of 30 s. The lower amount in grams the more sensitive you are to pain. | Baseline | 
| Mechanical Pain Threshold for Pain at 45 Minutes in Grams. | Mechanical pain threshold for pain at 45 minutes utilizing a digital electrovonfrey anesthesiometer (IITC model Alemo 2290-4; Woodland Hills, CA, USA). The subjects response to painful stimulus was recorded in grams. Each variable was estimated by averaging a participant's responses over 3 trials, with an intertrial interval of 30 s. The lower amount in grams the more sensitive you are to pain. | 45 minutes | 
| Mechanical Pain Threshold for Pain at 90 Minutes in Grams. | Mechanical pain threshold for pain at 90 minutes utilizing a digital electrovonfrey anesthesiometer (IITC model Alemo 2290-4; Woodland Hills, CA, USA). The subjects response to painful stimulus was recorded in grams. Each variable was estimated by averaging a participant's responses over 3 trials, with an intertrial interval of 30 s. The lower amount in grams the more sensitive you are to pain. | 90 minutes | 
| Suprathreshold Magnitude for Pain at Baseline Measured in Visual Analog Pain Scores. | Supra-threshold magnitude for pain was assessed utilizing the Medoc Pathway System with contact heat evoked potential simulator at 49 degrees Celsius. Visual analog pain score ranges from 0 (no pain) to 10 (worst pain imaginable). | Baseline | 
| Suprathreshold Magnitude for Pain at 45 Minutes Measured in Visual Analog Pain Scores. | Supra-threshold magnitude for pain was assessed utilizing the Medoc Pathway System with contact heat evoked potential simulator at 49 degrees Celsius. Visual analog pain score ranges from 0 (no pain) to 10 (worst pain imaginable). | 45 minutes | 
| Suprathreshold Magnitude for Pain at 90 Minutes Measured in Visual Analog Pain Scores. | Supra-threshold magnitude for pain was assessed utilizing the Medoc Pathway System with contact heat evoked potential simulator at 49 degrees Celsius. Visual analog pain score ranges from 0 (no pain) to 10 (worst pain imaginable). | 90 minutes | 
| Thermal Wind-up Pain Assessment at Baseline | Using a Visual Analog Scale (VAS) subjects will be asked to rate the painfulness of the stimulus for thermal wind-up pain utilizing the medoc pathway system. Each VAS score was recorded over 10 trials, with an interval of 3s. The average VAS score was reported. Visual analog scale ranges from 0 (no pain) to 10 (worst pain imaginable). | Baseline | 
| Thermal Wind-up Pain at 45 Minutes | Using a Visual Analog Scale (VAS) subjects will be asked to rate the painfulness of the stimulus for thermal wind-up pain utilizing the medoc pathway system. Each VAS score was recorded over 10 trials, with an interval of 3s. The average VAS score was reported. Visual analog scale ranges from 0 (no pain) to 10 (worst pain imaginable). | 45 minutes | 
| Thermal Wind-up Pain at 90 Minutes | Using a Visual Analog Scale (VAS) subjects will be asked to rate the painfulness of the stimulus for thermal wind-up pain utilizing the medoc pathway system. Each VAS score was recorded over 10 trials, with an interval of 3s. The average VAS score was reported. Visual analog scale ranges from 0 (no pain) to 10 (worst pain imaginable). | 90 minutes | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Volunteers