title: A quantitative magnetic resonance imaging study of cerebral and cerebellar gray matter volume in primary unipolar major depression: relationship to treatment response and clinical severity.
abstract: The authors investigated whether there were differences in cerebral and cerebellar gray and white matter volumes in depressed patients compared to controls, and whether this was associated with treatment response to fluoxetine. Brain magnetic resonance images were obtained from 38 unipolar depressed patients and 20 age, gender, and educationally matched comparison subjects. Patients were divided into groups of "responders" and "nonresponders" based on change in 17-item Hamilton Depression Rating Scale (HDRS) after an 8-week standardized trial of fluoxetine, 20 mg/day. There were no group mean differences in cerebral or cerebellar tissue volumes between patients and controls, or responders and nonresponders. For nonresponders to fluoxetine treatment, cerebral and cerebellar gray matter volume, and total cerebellar tissue volume decreased as baseline HDRS increased. The results suggest an association between gray matter volume and severity of illness in nonresponders to fluoxetine treatment.
authors.affiliation: Brain Imaging Center, McLean Hospital, Belmont, Massachusetts 02178, USA.
authors.forename: S S
authors.initials: SS
authors.lastname: Pillay
authors.forename: D A
authors.initials: DA
authors.lastname: Yurgelun-Todd
authors.forename: C M
authors.initials: CM
authors.lastname: Bonello
authors.forename: B
authors.initials: B
authors.lastname: Lafer
authors.forename: M
authors.initials: M
authors.lastname: Fava
authors.forename: P F
authors.initials: PF
authors.lastname: Renshaw
mesh_terms: D000328:Adult; D018687:Antidepressive Agents, Second-Generation / Q000627:therapeutic use*; D001921:Brain / Q000473:pathology*; D002508:Cephalometry / Q000295:instrumentation; D002531:Cerebellum / Q000473:pathology*; D003866:Depressive Disorder / Q000175:diagnosis* / Q000188:drug therapy / Q000523:psychology; D004311:Double-Blind Method; D005260:Female; D005473:Fluoxetine / Q000627:therapeutic use; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D008297:Male; D008875:Middle Aged; D010555:Personality Inventory; D012016:Reference Values; D016896:Treatment Outcome
chemical_list: D018687:Antidepressive Agents, Second-Generation; D005473:Fluoxetine