Pain Clinical Trial
— SENSOfficial title:
Sevoflurane's Effect on Neurocognition Study
The purpose of this study is to determine the effects of acute pain on long-term memory and conditioned physiologic responses in the presence and absence of low dose sevoflurane. Functional magnetic resonance imaging will be used to identify the neural correlates of these phenomena. The study will occur over 2 visits and involves no long-term follow up.
Status | Recruiting |
Enrollment | 60 |
Est. completion date | July 1, 2025 |
Est. primary completion date | July 1, 2025 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 59 Years |
Eligibility | Inclusion Criteria: - Adults, age 18-59, who are native English speakers with at least a high school education - have normal hearing and memory - be of normal body-weight - be generally healthy (free from significant chronic disease) - have none of the specific exclusion criteria - have a valid email address and valid phone number throughout the study - anticipate ability to participate in all visits required for the phase of the study in which they are enrolled Exclusion Criteria: - being pregnant or attempting to conceive - having a body mass index (BMI) > 35 - having significant memory impairment or hearing loss - having sleep apnea - having chronic pain or frequently taking pain medication (including tramadol) - having any severe or poorly-controlled medical problem (hypertension, diabetes) - having neurologic or psychiatric disease, including anxiety, and depression - having significant cardiac valvular disease or cardiomyopathy - having a history of abnormal heartbeats (cardiac conduction abnormality or arrhythmia) - having a history of seizures or convulsions - having a history of liver disease - having a history of asthma or other significant pulmonary disease - having a history of malignant hyperthermia, muscular dystrophy, central core disease, or hyperkalemia - being claustrophobic - have metal implants or non-removable metal piercings - having a history of adverse reaction to anesthetics - daily alcohol or heavy alcohol use; history of alcohol abuse - current daily smoker - regular or recent marijuana use (including prescribed/medical marijuana) - illicit drug use - regularly taking: antiepileptics, antidepressants, anti-psychotics, antihistamines, anti-anxiety medication, stimulants, or sleep-aids - current use of selective serotonin reuptake inhibitors (SSRIs), noradrenaline reuptake inhibitors (SNRIs), or monoamine oxidase inhibitors (MAOIs) and some other specific drugs phenytoin, carbamazepine, and rifampin - history of QT prolongation - hypersensitivity or allergic reaction to ondansetron (Zofran) |
Country | Name | City | State |
---|---|---|---|
United States | University of Pittsburgh | Pittsburgh | Pennsylvania |
Lead Sponsor | Collaborator |
---|---|
Keith M. Vogt, MD, PhD | National Institute of General Medical Sciences (NIGMS) |
United States,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | functional magnetic resonance imaging activation in response to experimental tasks | Event-related blood-oxygen level dependent (BOLD) Magnetic Resonance Imaging (MRI) responses will be determined for each experimental item presented, revealing localized changes in blood flow, which correlate to increased neuronal activity. These will be averaged across the multiple repetitions of each type of experimental item (memory only, pain only, and memory+pain), creating an anatomical map of Z-scores. Cross-condition comparisons will be the main effect of interest, comparing saline to low concentration sevoflurane AND comparing saline to high concentration sevoflurane. | Visit 1: Immediate; average activity, calculated from each task scan | |
Primary | Functional connectivity | Whole-brain functional connectivity will be determined in each condition (no-sevoflurane, low-dose, and high-dose). This generates a matrix of cross-correlation values. Cross-condition comparisons will be the main effect of interest, comparing no sevoflurane to low concentration sevoflurane AND comparing no-sevoflurane to high concentration sevoflurane. | Visit 1: Immediate; brain activity captured in data acquired across entire 6-8 minute scan. | |
Secondary | Explicit memory performance | Recognition memory testing, using the Remember-Know procedure, in which subjects indicate whether they recognize previously experienced experimental items among novel items (not previously in the experiment). This allows calculation of interdependent measures of recollection & familiarity using the signal detection statistic, d'. d' is calculated as the cumulative Gaussian distribution of false positive responses subtracted from the cumulative Gaussian distribution of correctly identified previously-experienced items. d' is on a (theoretically infinite) scale of standard deviation units, with negative values representing performance worse than chance guessing and positive values representing stand deviations of performance above chance. | Visit 2: 24-hrs post-learning experiment |
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