Predictors of Antidepressant Response

• Status: Completed
• Trial end date: 2015-10-01
• Target enrollment: 0
• Participant gender: All

Summary

Major depression is a highly prevalent, frequently debilitating illness that too often fails to respond to currently available treatments such as antidepressant medication. Furthermore, randomized controlled trials of antidepressants consistently demonstrate large placebo effects. The investigators hypothesize that individual differences in the function of key brain circuits underlie the observed variability in clinical responses to both placebo and antidepressant medication. This study will test this hypothesis by recruiting treatment-seeking volunteers with major depression, with or without comorbid nicotine dependence. Volunteers will participate in positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) scans in the context of a treatment trial in which they will receive both placebo and antidepressant medication. A major goal of the study is to improve prediction of individual clinical responses in future treatment trials in which brain imaging may be unavailable, and to study the mechanisms of antidepressant response in Major Depression.

• Phase: Phase 4
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: University of Michigan
• Treatments: Antidepressive Agents; Citalopram; Dexetimide

Criteria

Inclusion Criteria: Inclusion criteria will include:

• Participants diagnosed with Major Depressive Disorder and will include Hamilton Depressive Rating Scale (HDRS) scores >15

Exclusion Criteria:

• Comorbid conditions that are medical, neurological or psychiatric, pregnancy, use of hormones (including birth control) or use of psychotropic agents

• We will only permit certain past anxiety disorder diagnoses, including generalized anxiety, panic, agoraphobia, social phobia

• We also will exclude left-handed individuals and patients who have used any centrally acting medications or recreational drugs with the past 2 months

• No history of an implant, pacemaker or pacemaker wires, open heart surgery, artificial heart valve, brain aneurysm surgery, middle ear implant, hearing aid, braces or extensive dental work, cataract surgery or lens implant, implanted mechanical or electrical device, or artificial limb or joint

• No metallic object in their body (such as braces) or have a history of foreign metallic object in the body such as bullets, BB's, pellets, shrapnel, or other metal fragments