At a glance
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Investigation of Cocaine Addiction Using mGluR5 PET and fMRI
In Brief
A Phase 1 clinical trial evaluating Psychiatric and Cognitive Testing, Cocaine Self-adminstration, and 2 other interventions for Cocaine Dependence. Completed, enrolled 32 participants across 1 site.
Detailed Summary
The proposed research program will investigate the changes in brain chemistry and circuitry that 're-wire' the brain during chronic cocaine use, promote relapse, and complicate treatment efforts. Currently-using and non-treatment-seeking individuals with a cocaine use disorder will undergo a cocaine self-administration paradigm 2-5 days prior to completing positron emission tomography (PET) and functional magnetic resonance imaging (fMRI).
Study Details
Timeline
Interventions
Interviews, questionnaires, and computer testing.
The intervention will include a training and safety session that consists of physician/nurse-administered cocaine followed by a self-regulated cocaine administration period under carefully controlled and closely monitored conditions.
PET scans will be performed on a High Resolution Research Tomograph (HRRT), the highest resolution human brain scanner available. Antecubital venous catheters will be used for IV administration of the radiotracer and for venous blood sampling. A radial artery catheter may also be inserted by an experienced physician before the PET scan. At the beginning of each scan, the participants's head will be immobilized and a 6-minute transmission scan, using an orbiting 137Cs point-source, is obtained and used for attenuation correction. PET scans will be acquired using bolus or bolus plus constant infusion administration of \[18F\]FPEB.
Structural and functional MRI data will be acquired using a Siemens Trio TIM 3.0T system at the Yale Magnetic Resonance Research Center. High-resolution structural MRI data will be acquired to facilitate analysis of PET data and may be used in additional analysis of tissue volume and brain structure. Resting-state and task-based functional MRI data will be acquired using state-of-the-art multiband echo-planar imaging (EPI) gradient-echo sequences. Diffusion-weighted MRI data will also be acquired using multiband imaging sequences to investigate anatomical connectivity.