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288 active trials for Major Depressive Disorder

Mechanism of Action Underlying Ketamine's Antidepressant Effects: The AMPA Throughput Theory in Patients With Treatment-Resistant Major Depression

Background: Most drugs that treat mood disorders take a long time to work. Ketamine works within hours. A dose can last for a week or more. Certain receptors in the brain might help ketamine work. A drug that blocks these receptors might affect how it works. Objective: To see if the antidepressant response of ketamine is linked to AMPA receptors. Eligibility: Adults ages 18-70 with major depression disorder without psychotic features Design: Participants will be screened under protocol 01-M-0254. They will have blood tests and a physical exam. Participants will stay at the NIH Clinical Center for 5 weeks. Phase 1 lasts 4 weeks. For 2 weeks, participants will taper off their psychiatric medicine. Then they will have the following tests: Blood draws Psychological tests MRI: Participants will lie in a machine that takes pictures of their brain. MEG: Participants will lie down and do tasks. A cone lowered on their head will record brain activity. Optional sleep tests: Electrodes on the scalp and body and belts around the body will monitor participants while they sleep. Optional TMS: Participants will do tasks while a wire coil is held on their scalp. An electrical current will pass through the coil that affects brain activity. For phase 2, on day 0 participants will take the study drug or a placebo orally. While having a MEG, they will get ketamine infused into a vein in one arm while blood is drawn from a vein in the other arm. On day 1, participants will again take the study drug or a placebo orally. On days 3-7, they will repeat many of the phase 1 tests. Days 8 and 9 are optional and include an open label ketamine treatment and many of the phase 1 tests.

Start: January 2020
Cognitive Reappraisal in Adolescents With Major Depression

Major depression (MD) is common during adolescence and associated with significant morbidity and mortality. One important factor for the development and maintenance of adolescent MD are disturbances in emotion regulation, including deficits in cognitive reappraisal (CR). CR is a particularly effective emotion regulation strategy that aims at reinterpreting emotional events to modify affective responses. Adolescents with MD apply this strategy less often than their healthy peers and show disturbances in brain activation patterns underlying CR. In this study, MD adolescents will be randomly assigned to a group that receives a task-based training in CR or to a control training group. It will be examined whether the task-based CR training is superior to the control training with regard to improvements in negative affect, perceived stress in daily life and depressive symptoms. Moreover, during the four training sessions, the event-related potential "Late Positive Potential" (LPP) will be recorded to assess neurophysiological indices of CR processes and gaze fixations on emotional areas within negative pictures and affective responses to pictures will be collected to identify mechanisms underlying training effects.This study will provide first evidence for the efficacy of a short-time training that has previously shown to be effective in healthy individuals. Moreover, the study will identify neurobiological mechanisms that predict training effects. The results of this investigation will lay the ground for a clinical trial to investigate whether a CR training added to an established intervention improves treatment effects for adolescent MD.

Start: May 2019