Chronic Pain Clinical Trial
Official title:
Project 1 Aim 2, Adaptations of the Brain in Chronic Pain With Opioid Exposure
This study is designed to track brain functional changes in individuals with i) chronic back pain + opioid use (CBP+O) and individuals with ii) chronic back pain + opioid misuse disorder (CBP+mOUD) following a brief drug delay and re-exposure manipulation. Re-exposure could be placebo, the participant's own opioid dose, or a dopaminergic treatment (DA+NSAID). The participants will be also evaluated for changes in cognition, emotion, and motor abilities with opioid delay and re-exposure to placebo, opioid, or DA+NSAID.
Screening Visit (2-3 hours) (if applicable): Participants that have participated in Project 1 Aim 1 within three months of consenting to Project 1 Aim 2 will not require a screening visit and can continue on to Visit 1, 2 and 3 of Aim 2. A screening visit will be applicable for those participants that did not participate in Project 1 Aim 1, and for those that had participated but did so more than three months prior to consenting to Project 1 Aim 2. Participants will be evaluated with inclusion/exclusion criteria and complete the informed consent. A medical/pain history will be taken and a physical exam will be completed by a physician. Participants will complete a number of questionnaires assessing health and medical history, past and current pain levels, and personality. Participants will have their blood drawn to confirm appropriate kidney and liver function (investigators will take ~40mL of blood). Participants will also be asked to provide a urine sample to confirm if any illicit drugs are in their system. Participants will also be instructed to report their pain and craving ratings via an application that will be downloaded on their device. They will need to complete two ratings per day that they are involved in the study. Visit 1, 2, and 3 (6-8 hours): Participants will be instructed to not take their morning opioid medication. Upon arrival, participants will be asked to report their pain and craving using the Pain and Craving Index (PCI), which will be used as a baseline rating. They will complete the PCI once every hour throughout their visit. Once their PCI has increased by at least two-points from their baseline rating, the patient will undergo their first brain MRI scan (anatomical and functional scans). Between arrival and the first MRI, participants will complete several questionnaires regarding pain, mood, thoughts, and feelings. Directly after the MRI, participants will have their blood drawn. This blood draw will be used to quantitatively analyze the participants' opioid levels. Participants will then complete the NIH Toolbox. The NIH Toolbox is a compilation of activities that evaluate different cognitive, motor and emotional functions. Participants will then be randomized and receive "Treatment Dose #1." Treatment dose #1 will be one of the following: a single dose of the participant's opioid prescription (provided by Northwestern Memorial Hospital's investigational pharmacy), carbidopa/levodopa (c-dopa/l-dopa), or placebo (lactose). Participants will then complete the same questionnaires as they previously had, undergo a second brain MRI scan, have their blood drawn, and complete a second NIH Toolbox. Participants will then receive "Treatment Dose #2." For those participants that received their opioid medication for treatment dose #1, they will receive placebo for their treatment dose #2. For those participants that received carbidopa/levodopa or placebo for treatment dose #1, they will receive their opioid prescription for their treatment dose #2. After receiving treatment dose #2, participants will be done with their imaging visit. Each participant will have three total imaging visits. The activities within each imaging visit will be identical, the only variable will be the study intervention (opioid, c-dopa/l-dopa, or placebo) that they receive. All participants will receive each of the possible study interventions; however, the sequence of when they will receive each drug will be different from participant to participant. Neither participants nor the clinical coordinator/assistant will know which intervention the participant is receiving. ;
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