Pain Clinical Trial
Official title:
The Role of Endogenous Opioidergic Systems in Breathing Based Analgesia
Verified date | June 2019 |
Source | University of California, San Diego |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Interventional |
The purpose of this psychophysical and pharmacologic study is to determine if slow-breathing induced pain relief is mediated by endogenous opioids in response to intravenous (IV) administration of the opioid antagonist naloxone during noxious heat stimulation. We were also interested in disentangling the endogenous analgesic mechanisms supporting mindfulness-based analgesia.
Status | Completed |
Enrollment | 60 |
Est. completion date | June 27, 2017 |
Est. primary completion date | June 27, 2017 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 55 Years |
Eligibility |
Inclusion Criteria: - Normal volunteers with no history of chronic pain problems - Volunteers had no prior meditation experience - Volunteers could be male and non-pregnant females. - Volunteers of all ethnic backgrounds were included. Exclusion Criteria: - Female volunteers could not be pregnant. - They could not be taking opioids or antidepressants. - Subjects with a repeated history of syncope, loss of consciousness, light headedness, nausea, dizziness, or vomiting in response to needles or blood could not participate in the study. - Subject could not be using exogenous opiates for the complete duration of the study. |
Country | Name | City | State |
---|---|---|---|
United States | Wake Forest University Health Sciences | Winston-Salem | North Carolina |
Lead Sponsor | Collaborator |
---|---|
University of California, San Diego |
United States,
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* Note: There are 40 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Change in Visual Analog Scale Pain intensity and Unpleasantness ratings as a function of each respective cognitive manipulations and activation in response to naloxone and/or saline. | The visual analog scale (VAS) measures pain ratings that are assessed in response to noxious (49°C) thermal stimuli applied to the back of the right calf muscle. Pain intensity and unpleasantness ratings will be assessed with a Visual Analog Scale. The minimum rating ("0") is designated as "no pain" whereas the maximum ("10") is labeled as "most intense imaginable" or "most unpleasant imaginable". Higher values corresponded to higher perceived pain ratings. Pain ratings were assessed at baseline (session 1) and again at sessions six and seven to determine the impact of the mental training regimens. At session six and seven, subjects were given an infusion of either naloxone or saline to address the potential contribution of the opioidergic system in the cognitive modulation of pain. |
Up to 3 weeks | |
Secondary | Respiration Rate Measures | A respiratory transducer (TSD 201; Biopac Systems) was placed around the chest to measure the participant's rate of respiration. | Up to 3 weeks | |
Secondary | State Anxiety Inventory | This inventory is a 20 question test used to measure a subject's state of anxiety. A numeric value between 1 (Not at all) and 4 (Very Much So) is provided in response to each statement. The range of scores for this test is between 20 and 80, with higher scores reflecting higher estimates of anxiety. | up to 3 weeks | |
Secondary | Pain Catastrophizing Scale (PCS) | The PCS is a 13 item scale, with each item rated on a 5-point scale between: 0 (Not at all) and 4 (all the time). The PCS is broken into three subscales including: magnification, rumination, and helplessness. The total range of scores is between 0-52 with higher values reflecting more salient impacts of pain on one's day to day experience. | up to 3 weeks | |
Secondary | Cohen Perceived Stress Scale (CPS) | The CPS is a series of 10 temporally constrained (i.e. in the last month) questions meant to ascertain the relative frequency of stressors in one's life, ranging from never (scored as 0) to very often (scored as 4). All positively stated questions are reversed scored and then all items are summed to yield a final estimate of stress. The higher the score the higher the level of stress. | up to 3 weeks | |
Secondary | Treatment Effectiveness Scale | A VAS assessed the effectiveness of the study's intervention. Values on this scale vary continuously between 0 (not effective) and 10 (most effective imaginable). Higher values indicate a subject's greater confidence in the perceived treatment effectiveness. | up to 3 weeks | |
Secondary | Attitude Toward Treatment Scale (ATTS) | The ATTS was used to monitor a participant's impressions and attitudes about the interventions used in this study. It supplies 5 multiple-choice questions answered on a 10 point scale, ranging from 0 (not logical) to 9 (very logical). Higher scores reflect more positive subject impressions about the therapeutic interventions. | up to 3 weeks | |
Secondary | Center for Epidemiological Studies Depression Scale (CES-D) | This is a brief self-report questionnaire used to measure the severity of depressive symptoms. The CES-D is an inventory of 20 self-report items regarding depressive symptoms. Each question is graded on a 0 to 3 point scale with 0 representing "not at all" and 3 representing "a lot". Four questions (4,8,12, and 16) are reverse scored. A score of 15 or higher indicates a risk for depression. | up to 3 weeks | |
Secondary | Stress-Level Visual Analogue Scale | A VAS was employed to measure subjective stress ratings. Values on this scale vary continuously between 0 (no stress) to 10 (most stress imaginable). Higher values indicate higher assessments of the subject's stress level. | up to 3 weeks | |
Secondary | Naloxone Symptom Assessments | A numerical ratings scale was used to assess potential naloxone related symptomology after each clinical research unit session. "0" was designated as "non-existent" and "6" was characterized as "extremely strong". We measured symptoms corresponding to "dry mouth, dry skin, blurred vision, sedation, nausea, dizziness, and headache." | Up to 3 weeks |
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