Effects of Duloxetine on Pathological Worry in Patients With Generalized Anxiety Disorder: A fMRI Study
(1) to compare the differences of neural activation of pathological worry between pre-treatment GAD patients and normal subjects; (2) to measure the differences of brain activation on worry in GAD patients before and after duloxetine treatment
|Study Design:||Endpoint Classification: Efficacy Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
|Official Title:||Effects of Duloxetine on Pathological Worry in Patients With Generalized Anxiety Disorder: A fMRI Study|
- difference of brain activation on worry [ Time Frame: two months ] [ Designated as safety issue: No ]
|Study Start Date:||April 2007|
|Study Completion Date:||November 2008|
|Primary Completion Date:||November 2008 (Final data collection date for primary outcome measure)|
Drug: duloxetine hydrochloride
The study will recruit 20 GAD patients and 20 healthy controls. Both patients and controls receive a medical and psychiatric screening procedure at visit 1 and are asked to complete three self-rating questionnaires and one health questionnaire at visit 1. All qualified participants will receive functional magnetic resonance imaging (fMRI) at baseline.
The patients will begin treatment with duloxetine 30 mg/day at visit 2 and will be titrated to 60 mg/day at visit 3 (2 week since drug dispensed). The dosage will be maintained on 60 mg/day for 6 more weeks. During the period, the patients will receive periodic evaluations at visit 2 (0 week drug dispensed), 3 (2 week since drug dispensed), 4 (4 weeks since drug dispensed), and 5 (8 weeks since drug dispensed). The patients will receive fMRI examination at baseline and at the end of the 8-week treatment.