Brain Imaging Techniques That Predict Antidepressant Responsiveness

Not Applicable

Completed

Conditions: Major Depressive Disorder

Interventions: Drug: Venlafaxine ERT
Drug: Fluoxetine

Registration Number: NCT00909155

Lead Sponsor: University of Wisconsin, Madison

Brief Summary: Do functional brain changes occur during Venlafaxine ER (extended release) versus Fluoxetine treatment and do changes in selective structures, such as the amygdala, predict treatment response?

Detailed Description: This is a single site, controlled, double-blind study of outpatients. There are two arms:

1. Forty participants who have a current Diagnostic and Statistical Manual of Mental Disorders, 4th edition, text revised (DSM-IV-TR) diagnosis of Major Depression will be recruited. These subjects will be randomized to receive one of two antidepressant medications: Fluoxetine or Venlafaxine ER for the duration of the study. Subjects will gradually be titrated onto the medications and will be seen in the clinic up to 18 times for medication checks, to monitor side effects and depressive symptoms, including suicidal ideation. In the event of suicidal ideation, subjects will be withdrawn from the study and referred for immediate treatment.

2. Twenty normal control subjects with no current or past DSM-IV-TR diagnosis and will receive no medication. Normal control subjects will have up to 5 visits while in the study.

Subjects will contact study staff to complete a phone screen and then eligible subjects will complete a clinic screen. Subjects will then be scheduled to attend the magnetic resonance imaging (MRI) simulation visit and if subjects continue to meet entrance criteria, they will be scheduled for the first MRI. Following the first MRI, subjects in the medication conditions will begin receiving medication.

All subjects will undergo 3 functional magnetic resonance imaging (fMRI)s during the study: at the beginning of the study, approximately 8 weeks and 26 weeks later. During the MRI, subjects will view slides with positive and negative emotional content. Subjects will complete various clinical interviews or rating scales assessing mood and side effects at each of the visits.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 50

Inclusion Criteria

Intervention Group:
- Right-handed,
- Be able to lie still on their back for about 120 minutes,
- Meet DSM-IV criteria for major depression (single or recurrent),
- Have had depressive symptoms for at least 1 month prior to screen visit,
- Must score an 18 or above on the Hamilton-D at both the initial screening visit and first fMRI scanning session,
- Able to understand and speak English.
Control Group: same as above with the exception of no diagnosis of psychiatric disorder.

Exclusion Criteria

Any history of seizures,
Current medical disorders that might make interpretation of scan data difficult,
Diabetes requiring insulin treatment,
A serious heart disorder or subjects who have had a heart attack within the last 3 months,
Subjects who meet DSM-IV criteria for alcohol/drug abuse or dependence within the last six months,
Other current DSM-IV Axis I or Axis II diagnoses,
A personal or family history of bipolar disorder,
Current use of medication that affects central nervous system (CNS) function,
Participation in the last 30 days in a clinical study involving an investigational drug,
A subject with metallic implants, such as prostheses, shrapnel or aneurysm clip-S, or persons with electronic implants, such as cardiac pacemakers. The magnetic field generated by the MRI machine can cause a displacement or malfunctioning of these devices.
A subject who is claustrophobic,
Female subjects who are pregnant,
A subject at serious risk for suicide,
Diagnosis of cancer in the past 3 years and/or has active neoplastic disease,
Nonresponse to 2 adequate trials of antidepressant treatment,
Nonresponse to 2 adequate trials of an empirically supported psychotherapy.

Study & Design

Study Type: INTERVENTIONAL

Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Depressed; Venlafaxine treatment	Venlafaxine ERT	Currently depressed subjects; Randomized medication treatment with Venlafaxine extended release tablets (Venlafaxine ERT). Dosage 75-300mg/day for up to 6 months.
Depressed; Fluoxetine treatment	Fluoxetine	Currently depressed subjects; Randomized medication treatment with Fluoxetine tablets. Dosage 20-80mg/day for up to 6 months.

Primary Outcome Measures

Name	Time	Method
Hamilton Depression (HAM-D) and Anxiety (HAM-A) Rating Scales	Study entry, 2 months, and at end of study (6 mos)	Hamilton Depression rating scale is a clinician assessment tool to measure severity of depression symptoms. Minimum score is 0 (no symptoms); maximum score is 52 (severe symptoms of depression). Hamilton Anxiety rating scale is a clinician assessment tool to measure severity of anxiety symptoms. Minimum score is 0 (no symptoms); maximum score is 56 (severe symptoms of anxiety).
Functional Magnetic Resonance Imaging (fMRI) Response to an Emotional Regulation Task.	At study entry, 2 months and end of study (6 months)	Depressed participants were scanned while viewing a sequence of positive and negative images; they were instructed to enhance or supress their emotional response to the image or to continue to attend. To examine brain function when regulating negative affect, we created contrast maps for each participant at all 3 time points by subtracting the attend condition from the suppress condition in response to negative stimuli. Data from all 3 scan sessions were used to assess treatment-induced change in brain activity when regulating emotion. Analyses examining change using difference scores (end vs. starting points), we subtracted initial HAMD score from final HAMD score. For fMRI analyses, in a voxelwise manner, we subtracted initial negative suppress vs attend from final negative suppress vs attend. Control subjects were not depressed, repeat scans to assess change were not completed. Reported results are from BA10, one of our areas of interest.